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Simultaneous removal of indomethacine, papaverine and allopurinol from aqueous solution by using submerged aquatic plant nasturtium officinale
(Asian Journal of Chemistry, 2010) Okumuş, Veysi; Varhan, Elif; Başaran, Davut; Onay, Ahmet
Simultaneous removal of indomethacine, papaverine and allopurinol from aqueous solution by using submerged aquatic plant Nasturtium officinale biomass in high performance thin layer chromatography (HPTLC) was studied. Optimum biosorption conditions were determined as a function of contact time, pH, removal capacity of the amount of biomass and initial dry concentration. Experiments were performed in batch conditions. Concentrations of the drugs in the remaining solutions were simultaneously analyzed by HPTLC. Langmuir and Freundlich models were applied to describe the biosorption isotherm of the drugs by aquatic plant Nasturtium officinale biomass. According to the results, optimum parameters were found as 2.0 g biomass, pH:5.0 and 60 min contact time. Obtained from plots of Langmuir and Freundlich adsorption models, the highest drug uptakes were calculated from Langmuir isotherm and found to be 43.10, 39.68 and 38.61 mg/g for indomethacine, papaverine and allopurinol, respectively.
Simultaneous high-performance thin layer chromatographic determination of indole acetic acid, indole butyric acid, and absisic acid in in vitro Seedling of watermelon exposed to heavy metals
(Journal of Planar Chromatography, 2012) Kılınç, Ersin; Okumuş, Veysi; Düz, Mehmet Zahir; Aydın, Fırat
A new method based on the use of high-performance thin-layer chromatography (HPTLC) was developed for the simultaneous determination of the plant growth hormones, indole acetic acid, indole butyric acid, and absisic acid in in vitro seedling of watermelon. The measurements were performed at the associate maximum absorption wavelength of hormones. Calibration plots were constructed in the range of 50–600 ng per spot for indole acetic acid, 50–600 ng per spot for indole butyric acid, and 50–600 ng per spot for absisic acid. The limits of quantification (LOQs) determined experimentally were as follows: 10, 10, and 6 ng per spot, respectively, for indole acetic acid, indole butyric acid, and absisic acid. The method was successfully applied to watermelon tissues exposed to Cu2+, Co2+, and Pb2+ for determination of its indole acetic acid, indole butyric acid, and absisic acid concentrations.
Isolation a thermophilic anoxybacillus flavithermus sp. nov. and production of thermostable α-amylase under solid-state fermentation (SSF)
(Annals of Microbiology, 2012) Özdemir, Sadin; Matpan, Fatma; Okumuş, Veysi; Dündar, Abdurrahman; Ulutaş, Sefa; Kumru, Mert
A new bacteria was isolated from hot-spring water of Gazlıgöl, Afyonkarahisar in Turkey. Based on morphological and biochemical tests and 16S rRNA gene sequence analysis, the isolate belonged to the Anoxybacillus flavithermus species which has 99% similarity with the bacterium DNA. The production of α-amylase by thermophilic Anoxybacillus flavithermus was investigated under solid-state fermentation by using some agricultural waste as substrates. Solid substrates such as rice husk, banana husk, millet, water melon husk, lentil bran, wheat bran and maize oil cake were studied for enzyme production. Of these, rice husk was proved as the best substrate for α-amylase production (1,271 U/mg). The maximum α-amylase production was observed as 1,803 U/mg at 72 h, 1,000 μm particle size, 70% initial moisture content (w/v), and 40% inoculum level (v/w). Among the various nitrogen sources tested, 1% peptone (3,170 U/mg) was found to be the best nitrogen source for α-amylase production. As additional carbon sources, 1% starch (2,364 U/mg) enhanced α-amylase production. The optimum temperature for the activity of α-amylase was found to be 70°C. The enzyme was optimally active at pH 6.0 and stable in the pH range of 6.0–8.0.
Heavy metals biosorption by submerged aquatic plant nasturtium officinale
(Asian Journal of Chemistry, 2010) Okumuş, Veysi; Başaran, Davut; Onay, Ahmet
In the present investigation an aquatic plant, Nasturtium officinale was examined for its biosorption ability of heavy metal ions. The results obtained from biosorption experiments were used to understand the driving forces that govern the interaction between metal ions and biosorbent. The experimental biosorption data were fitted to the Scatchard plot, Langmiur and Freundlich isotherms. According to the parameters of the Langmiur isotherm, the maximum biosorption capacities of Cd2+ and Co2+ were 0.56 and 0.49 mg/g, respectively. In view of Freundlich isotherms, the maximum biosorption capacities of Cd2+ and Co2+ were 2.23 mg/g for both of metal ions.
In vitro propagation of Diyarbakır watermelons and comparison of direct seeded and transplanted watermelon
(Turkish Journal of Biology, 2011) Okumuş, Veysi; Pirinç, Vedat; Onay, Ahmet; Başaran, Davut
A rapid protocol using shoot tip explants for micropropagation of Diyarbakır watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai] types Surme, Beyazkış and Karakış was achieved. Shoot tips from 5-day-old in vitro germinated seedlings were cultured on shoot regeneration medium for 3 weeks. Th e eff ects of the diff erent concentrations of benzyl adenine (BA) and carbohydrate types on shoot proliferation were examined. Th e results confi rmed that a range of 0.5-1.0 mg/L of BA was almost equally eff ective in promoting the shoot length of cultures in the 3 genotypes. Sucrose, in the presence of BA, was superior to other carbohydrates for the 3 genotypes studied in terms of the number of proliferated shoots and the average shoot length obtained. Th e highest percentage of rooting was achieved when medium supplemented with 1.0 mg/L of indole-3-butyric acid (IBA) was used for the 3 genotypes. Th e highest frequency of acclimatized plantlets for the 3 genotypes was 85%, 85%, and 90%, respectively, in sterile compost, when the shoots of Beyazkış, Karakış, and Surme were rooted in the IBA-supplemented rooting treatments. Th e Surme genotype produced a signifi cantly higher yield and mean fruit weight than the Beyazkış and Karakış genotypes in both direct-seeded and transplanted watermelons. Th e main soluble sugar of the experimental types was separated, identifi ed, and quantifi ed using high performance liquid chromatography (HPLC). Fructose was found to be the most abundant sugar and was highly detected in Beyazkış for the seeded watermelon and in Karakış for the transplanted watermelon. Th is demonstrates that in vitro propagation can be used to produce high quality diploid Diyarbakır watermelon for use in breeding lines.
Biosorption of 2,4-D, 2,4-DP and 2,4-DB from aqueous solution by using thermophilic anoxybacillus flavitermus and analysis by high performance thin layer chromatography: equilibrium and kinetic studies
(Environmental Progress & Sustainable Energy, 2012) Özdemir, Sadin; Matpan, Fatma; Okumuş, Veysi; Dündar, Abdurrahman; Kılınç, Ersin
In this study, the potential biosorption characteristics of the thermophilic Anoxybacillus flavithermus (A. flavithermus) was investigated for the removal of the chlorophenoxy acid derivates, namely, 2,4-dichlorophenoxy acetic acid (2,4-D), 2,4-dichlorophenoxy propanoic acid (2,4-DP or dichlorprop), and 2,4-dichlorophenoxy butyric acid (2,4-DB). The experiments were performed for the simultaneous biosorption of the studied pesticides. Optimum biosorption conditions were determined as a function of contact time, pH of the solution, amount of biomass, and initial pesticides concentrations. The concentrations of the pesticides in the remaining solutions were simultaneously analyzed by high performance thin layer chromatography. The optimum parameters were found as pH: 4.0 for biosorption medium, 60 min of contact time, 50 mg of bacteria, and 50 mg L21 of initial pesticides concentrations. Langmuir and Freundlich models were applied to describe the biosorption isotherm of the pesticides by A. flavithermus as biomass. Biosorption of pesticides on to A. flavithermus showed pseudo first-order rate kinetics at different initial concentration of pesticides and different temperatures. The experimental adsorption data were fitted both the Langmuir and Freundlich adsorption models. Fourier-transform Infrared spectroscopy was used to understand the bonding mechanism of pesticides to biosorbent and surface functionality of the biosorbent The highest pesticide uptake was calculated from Langmuir isotherm and found to be 24.15 mg/g for 2,4-D Among the studied pesticides, 2,4-DP showed difference adsorption behavior. According to in your comments the reason of this that 2,4-DP contain an asymmetric carbon atom, which provide a molecular chirality.
Pleurotus eryngii immobilized amberlite XAD-16 as a solid-phase biosorbent for preconcentrations of Cd2+ and Co2+ and their determination by ICP-OES
(Talanta, 2012) Özdemir, Sadin; Okumuş, Veysi; Kılınç, Ersin; Bilgetekin, Havin; Dündar, Abdurrahman; Ziyadanoğulları, Berrin
This article reports a method that is used for the preconcentration and determination of Cd and Co in vegetables, using Pleurotus eryngii immobilized Amberlite XAD-16 as a solid-phase biosorbent. The concentrations of metals were determined by inductively coupled plasma-optical spectrometry (ICP-OES). Critical parameters, such as the pH of the solution, flow rate, the amount of biosorbent, type and volume of eluent, and the sample volume, that affect the solid-phase extraction (SPE) procedure were optimized. The optimum extraction conditions were determined as being a pH of 6.0 for Cd and of 5.0 for Co; a sample flow rate of 2.0 mL min_1; 200.0 mg of biosorbent; and 5.0 mL of 1.0 mol L_1 HCl as eluent. The capacities of the biosorbent for metal uptake were found to be 11.3 and 9.8 mg g_1 for Cd and Co ions, respectively. Limit of quantitations (LOQs) were found to be 0.67 and 0.82 ng mL_1, respectively, for Cd and Co. The linear working curves were observed to be in the linear range from 1.0 to 50.0 ng mL_1, and possessed high correlation coefficients. The use of the SPE method showed 50.7- and 35.7-fold improvements in the sensitivities of ICP-OES. The developed method was successfully applied to NCS ZC-73014 (a certified reference tea sample). Relative standard deviations (RSD) were lower than 5.0%. The Cdand Co concentrations in the different parts (leave, root, stem, and fruit) of purslane, onion, rocket, okra, and aubergine were determined after microwave digestion and solid-phase extraction by P. eryngii immobilized on Amberlite XAD-16.
Design of novel binuclear phthalocyanines formed by dioxyphenyl bridges: Synthesis and investigation of thermal and antioxidant properties
(Zeitschrift für anorganische und allgemeine Chemie., 2012) Ağırtaş, Salih; Gümüş, İlkay; Okumuş, Veysi; Dündar, Abdurrahman
4,4_-(1,4-Phenylenebis(oxy)diphthalonitrile was synthesized by reaction of hydroquinone with 4-nitrophthalonitrile. Binuclear metallophthalocyanines 2–4 were obtained by the reaction between 4,4_-(1,4-phenylenebis(oxy)diphthalonitrile and 4-(benzo [d] [1,3] dioxol- 5-ylmethoxy)phthalonitrile in the presence of metal salts. These new compounds were characterized by using elemental analysis, FTIR, 1H-NMR and UV/Vis spectroscopic data. Thermal properties of phthalocyanines 2-4 were investigated by TG and DTA. In addition, antioxidant properties of compounds II, 3 and 4 were investigated. Their radical-scavenging capacity and chelating effects was fully studied. The maximum 1,1-diphenyl-2-picrylhydrazyl radicals (DPPH) were obtained from compound 3. Chelating effects on ferrous ions were 91.6 % at concentration of 100 mgL–1 with compound II.
Antioxidant properties, chemical composition and nutritional value of terfezia boudieri (Chatin) from Turkey.
(Food Science and Technology International, 2012) Dündar, Abdurrahman; Yeşil, Ömer Faruk; Acay, Hilal; Okumuş, Veysi; Özdemir, Sadin; Yıldız, Abdulnasır
Our objectives were to investigate the chemical composition, nutritive value and antioxidant activity potentials of Terfezia boudieri Chatin collected from different areas from Southeast of Turkey. The amounts of energy, protein, fat, carbohydrate, crude fibre, moisture and ash were 34.00–65.00 (kcal/100 g), 1.40–2.73, 0.86–1.71, 4.84–11.60, 80.86–90.33 (g/100 g, f.w.) and 1.02–1.98 g/100 g dry mass, respectively. Fatty acids and amino acids analyses revealed that linoleic acid and glutamic acid were, respectively the most abundant. Among the essential amino acids leucine was the highest amount and this was followed by threonine. Magnesium was the most abundant element with a concentration value of 182.30 mg/100 g dry mass. T. boudieri exhibited excellent antioxidant activity when compared with standard compounds. In total antioxidant and chelating effect on ferrous ions activity T. boudieri showed the highest activity against the standards. Additionally, at all studied tests antioxidant activity of the mushroom increased with increasing concentration. The total phenolic content of T. boudieri was found as 8.45 mg/g.
Antioxidant properties of cultured mycelia from four pleurotus species produced in submerged medium.
(International Journal of Food Properties, 2013) Dündar, Abdurrahman; Okumuş, Veysi; Özdemir, Sadin; Yıldız, Abdulnasır
The ethanolic extracts of dried cultured mycelia of Pleurotus ostreatus, Pleurotus eryngii, Pleurotus florida, and Pleurotus sajor-caju were analyzed for antioxidant activity in different systems. Tests used are as follows: reducing power, free radical scavenging, superoxide anion radical scavenging, total antioxidant activity, metal chelating activitiy, etc.; total phenolic content was determined. The percentage inhibition of P. ostreatus, P. eryngii, P. florida, and P. sajor-caju at 20 mg/mL concentration on peroxidation in a β-carotene–linoleic acid system was 57.19, 60.68, 62.12, and 58.81%, respectively. The reducing power of P. eryngii was higher than the other samples, and its value was 0.86 at 10 mg/mL concentration. P. ostreatus and P. sajor-caju proved to be better at scavenging superoxide anion radicals than the P. eryngii and P. florida. In the scavenging effect of DPPH radical test, P. ostreatus showed the highest activity potential and P. sajor-caju showed the strongest metal chelating capacity.
New water soluble phenoxy phenyl diazenyl benzoic acid substituted phthalocyanine derivatives: Synthesis, antioxidant activities, atypical aggregation behavior and electronic properties.
(Dyes and Pigments, 2013) Ağırtaş, Salih; Çelebi, Metin; Gümüş, Selçuk; Özdemir, Sadin; Okumuş, Veysi
Novel substituted phthalonitrile derivatives were obtained by the reaction of 2-(4-hydroxyphenylazo) benzoic acid and 4,5-dichloro-1,2-dicyanobenzene, or 4-nitrophthalonitrile. Peripherally phenoxy phenyl diazenyl benzoic acid substituted zinc (II) phthalocyanine complexes, and their sodium salts were synthesized and characterized for the first time. The newly synthesized phthalocyanine complexes show excellent solubility in water. The aggregation investigations carried out in different concentrations indicate that phenoxy phenyl diazenyl benzoic acid-substituted phthalocyanine compounds do not have any aggregation behavior for the concentration range of 7.00 _ 10_5e4.38 _ 10_6 M in DMF. The antioxidant activities of DMF solution of compounds were analyzed through radical scavenging, and chelating ability to Fe2ş cation. Additionally, new compounds did not show any antibacterial activity against some selected bacteria cultures. Moreover, the ground-state geometries of the complexes were optimized using density functional theory (DFT) methods at B3LYP/6-31G(d,p) level in order to obtain information about the 3D geometries and electronic structure.
Preconcentration of metal ions using microbacteria
(Microchimica Acta, 2013) Özdemir, Sadin; Okumuş, Veysi; Dündar, Abdurrahman; Kılınç, Ersin
This review (160 refs). covers the current state of the art of microbacteria-based sorbents for preconcentration of metal ions at trace levels. We highlight advantages and major challenges of the techniques and discuss future perspectives of both batch and column-based methods. Particular attention is paid to the preconcentration of metal ions using resinimmobilized microbacteria for solid phase extractions. We also discuss detection methods including UV–vis spectrophotometry, FAAS, ICP-OES and ICP-MS. Analytical figures of merit are compared, and examples are given for the application to a variety of samples including food, beverages, alloys, water, soil, and geological samples.
Solid phase extraction based on the use of agaricus arvensis as a fungal biomass for the preconcentrations of Pb and Al prior to their determination in vegetables by ICP-OES.
(Atomic Spectroscopy, 2013) Kılınç, Ersin; Dündar, Abdurrahman; Özdemir, Sadin; Okumuş, Veysi
A solid phase extraction (SPE) method based on the use of a fungal biomass as sorbent was developed for the preconcentrations of Pb and Al. Agaricus arvensis was immobilized on Amberlite XAD-4 and loaded onto a column. Important parameters such as pH and flow rate of the solution, amount of biosorbent and resin, volume of sample solution, which affect the efficiency of the preconcentration procedure for Pb and Al, were optimized. The effect of possible interfering ions, i.e., Cd2+, Cu2+, Ni2+, Zn2+, Co2+, Na+, K+, Ca2+, Mg2+, and Fe2+, was investigated. Experiments on the repeatability of the solid phase column showed that the same column could be used at least 30 cycles without loss of the biosorption efficiency for the recovery of Pb and Al. The limit of detection (LOD) of Pb and Al was found to be 0.10 ng mL-1 and 0.03 ng mL-1, respectively. The sensitivity of ICP-OES improved 39.8-fold for Pb and 39.5-fold for Al. Linearity was obtained in the concentration range of 1.25–50.0 ng mL-1 for Pb and 0.5–50.0 ng mL-1 for Al. The relative standard deviation (RSD) of the method under optimum conditions was lower than 8.4% (n=5) for Pb and Al, which was validated through the analysis of certified reference tea and poplar leaves samples. The biosorption capacity of immobilized Agaricus arvensis for Pb and Al was found to be 31.2 mg g-1 and 45.7 mg g-1, respectively. The developed method was applied to determine the concentrations of Pb and Al in various edible vegetable samples (cucumber, okra, tomato, beans, aubergine, watermelon, zucchini, pepper, melon, lettuce, roka, purslane, scallion, cress, parsley, cabbage, sugar cane, and basil) grown along the cultivated banks of the Tigris River in Diyarbakır, Turkey.
Preconcentration of Sn in real water samples by solid phase extraction based on the use of helvella leucopus as a fungal biomass prior to its determination by ICP-OES
(Atomic Spectroscopy, 2013) Kılınç, Ersin; Dündar, Abdurrahman; Özdemir, Sadin; Okumuş, Veysi
Recently, biosorbents of biological origin such as fungus, algae, and bacteria have found special application as packing material in solid phase extraction (SPE). In this study, an alternative SPE method was developed and validated for the preconcentration of Sn prior to its determination by inductively coupled plasma optical emission spectrometry (ICPOES). Helvella leucopus, a fungal biomass, was used as the biosorbent in the column studies. Experimental parameters, such as Ph and flow rate of the solution, amounts of biosorbent and resin, and volume of the sample solution which affects the analytical results, were investigated. Effects of possible interfering ions on the SPE preconcentration of Sn were investigated. The sensitivity of ICP-OES was improved 47.1 times for Sn. The LOD and LOQ values were 0.06 and 0.21 ng mL-1, respectively. Linearity was obtained in the concentration range of 1.0–30 ng mL-1 for Sn. The loading capacity of Helvella leucopus immobilized Amberlite XAD-4 was 10.4 g g-1. The concentrations of Sn in the water samples from the Tigris River were determined using the developed method and validated by analysis of the certified reference material NWTM-26.3 Fortified Water sample.
The use of fungal biomass agaricus bisporus immobilized on amberlite XAD-4 resin for the solid phase preconcentration of thorium
(Bioremediation Journal, 2014) Özdemir, Sadin; Okumuş, Veysi; Dündar, Abdurrahman; Kılınç, Ersin
Solid-phase extraction method was developed for the preconcentration of thorium (Th). Fungal biomass Agaricus bisporus was immobilized to Amberlite XAD-4 as solid-phase sorbent. The critical parameters such as pH of the sample solution, flow rate of the sample, volume of the sample, and the effect of major ions that affect the preconcentration of thorium in this system were evaluated. The optimum pH for the sorption of Th is 6.0, and quantitative elution occurs with 1.0 mol L−1 HCl. The loading capacity was determined as 0.079 mmol g−1. The optimized method was validated through analysis of the certified reference material of tea leaves (NCS ZC73014) and successfully applied to the determination of Th in a real ore sample with satisfactory results.
Selective preconcentration of lanthanum (III) by coriolus versicolor immobilized on amberlite XAD-4 and its determination by ICP-OES.
(International Journal of Environmental Analytical Chemistry, 2014) Özdemir, Sadin; Okumuş, Veysi; Dündar, Abdurrahman; Çelik, Kadir; Yüksel, Uyan; Kılınç, Ersin
Coriolus versicolor, a wood fungus, was immobilised on Amberlite XAD-4 and used as solid-phase biosorbent for preconcentrations of rare earth elements. La(III), Th(IV), U(IV) and Ce(III) were subjected to solid-phase extraction procedure. We observed that La(III) was selectively preconcentrated, while other ions remained in solution at pH 6.0. 5.0 mL of 1.0 mol L−1 HCl was used to elaute La(III) from column. 250 mg of C. versicolor loaded on 1000 mg of XAD-4 was optimised as solid-phase matrix. Concentrations of ions in solutions were determined by inductively coupled plasma– optical emission spectrometry (ICP-OES). The calibration plot after preconcentration was linear in the range from 1.0 to 50.0 ng mL−1 for La(III). Limit of detection was found as 0.27 ng mL−1 for La(III) by SPE method. Relative standard deviation was found lower than 6.7% for 1.0 ng mL−1 of La(III) solution (n = 10). The sensitivity of ICP-OES was improved by a factor of 46.8. The applicability of the method was validated through the analysis of certified reference samples of tea (NCS ZC-73014) and spinach (NCS ZC-73013).
Novel cobalt (II), zinc (II) phthalocyanines bearing discrete substituents: Synthesis, characterization, aggregation behavior, electrochemical properties and antioxidant activity
(Synthesis and Reactivity in Inorganic, Metal-Organic & Nano Metal Chemistry, 2014) Ağırtaş, Salih; Cabir, Beyza; Dündar, Abdurrahman; Okumuş, Veysi; Ceyhan, Gökhan
A new phthalonitrile derivative bearing 3,4,5-trimethoxybenzyloxy and chloro-substituents at peripheral position was prepared by a nucleophilic displacement reaction. Cyclotetramerization of phthalonitrile derivative in dimethylsulfoxide (DMSO) gave the metallophthalocyanines. Novel Co(II), Zn(II) phthalocyanines (Pcs) were obtained from the reaction 4-[(3,4,5- trimethoxybenzyloxy]-5-chlorophthalonitrile and metal salts. The novel compounds have been characterized by using elemental analysis, UV-Vis, FTIR, 1H-NMR spectral data. The aggregation behaviors of Co(II), Zn(II) Pcs were also investigated. These metallophthalocyanines do not show any aggregation behavior between 1.2 × 10−5 and 4.0 × 10−6Mconcentration range in DMF. The antioxidant activities of Pcs were investigated antioxidant assays such as free radical scavenging ability of 1,1-diphenyl-2-picryl-hydrazyl (DPPH) and ferrous ion chelating ability. Furthermore, the redox properties of the Pcs complexes were investigated by using cyclic voltammetry.
Synthesis and characterization of 1,2-bis(2-(5-bromo-2-hydroxybenzilidenamino)-4-chlorophenoxy)ethane ant its metal complexes:An experimental, theoretical, electrochemical, antioxidant and antibacterial study
(Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014) İlhan, Salih; Baykara, Haci; Tomsuk, Abdussamet; Okumuş, Veysi; Levent, Abdulkadir; Seyitoğlu, Salih; Özdemir, Sadin
A new Schiff base ligand was synthesized by reaction of 5-bromosalicylaldehyde with 1,2-bis(4-chloro-2- aminophenoxy)ethane. Then the Schiff base complexes were synthesized by the reaction of metal salts and the novel Schiff base. The molar conductivity properties of the complexes were studied and found out that the complexes are nonelectrolytes. The structures of the ligand and its metal complexes were characterized by elemental analysis, FT-IR, UV–VIS, magnetic susceptibility measurements, molar conductivity measurements, and thermal gravimetric analysis. In addition antioxidant, theoretical NMR studies and cyclic voltammetry of the complexes were done. Two methods namely metal chelating activity and diphenylpicrylhydrazyl (DPPH) radical scavenging method were used to determine the antioxidant activity, and antibacterial properties of the compounds were also studied.
Synthesis, characterization and experimental, theoretical, electrochemical, antioxidant and antibacterial study of a new schiff base and its complexes
(Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014) Baykara, Haci; İlhan, Salih; Levent, Abdulkadir; Seyitoğlu, Salih; Özdemir, Sadin; Okumuş, Veysi; Tomsuk, Abdussamet; Cornejo, Mauricio
A new Schiff base ligand was synthesized by reaction of salicylaldehyde with 1,6-bis(4-chloro-2-aminophenoxy) hexane. Then the Schiff base complexes were synthesized by metal salts and the Schiff base. The metal to ligand ratio of metal complexes was found to be 1:1. The Cu(II) complex is proposed to be square planar and the Co(II), Ni(II), Mn(II) and Zn(II) complexes are proposed to be tetrahedral geometry. The Ti(III) and V(III) complexes are proposed to be a capped octahedron in which a seventh ligand has been added to triangular face. The complexes are non-electrolytes as shown by their molar conductivities (KM). The structure of metal complexes is proposed from elemental analysis, FT-IR, UV–vis, magnetic susceptibility measurements, molar conductivity measurements, Mass Spectra and thermal gravimetric analysis. In addition antimicrobial and antioxidant studies, cyclic voltammetry of the complexes, theoretical 1H NMR and HOMO–LUMO energy calculations of the new di-functional ligand were done.
Metallo phthalocyanines bearing (2-((2-hydroxyethyl) (p-tolyl)amino)ethoxy) and (2-((2-phenoxyethyl) (p-tolyl)amino)ethoxy) phthalonitrile substituents: Synthesis, characterization, aggregation behavior, antioxidant and antibacterial activity
(Synthetic Metals, 2014) Çelebi, Metin; Ağırtaş, Salih; Özdemir, Sadin; Okumuş, Veysi
tThe novel phthalonitrile derivatives bearing (2-((2-hydroxyethyl)(p-tolyl)amino)ethoxy) and (2-((2-phenoxyethyl)(p-tolyl)amino)ethoxy)phthalonitrile substituents at peripheral position were preparedby a nucleophilic displacement reaction. Cyclotetramerization of these phthalonitrile derivatives in thepresence of corresponding metal salts gave the new metallophthalocyanines. The novel compounds werecharacterized by using various spectroscopic data. The aggregation investigations carried out in differ-ent concentrations indicate that phthalocyanine compounds do not have any aggregation behavior forthe concentration range of 10−4–10−6M in tetrahydrofuran. In vitro three antioxidant test methods,namely diphenylpicrylhydrazyl radical scavenging activity, metal chelating activity and reducing powerwere used to determine the antioxidant activity of compounds. Compounds were analyzed for theirantibacterial activity against some bacteria by using the disk-diffusion method.

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