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A study on supercapacitor electrode material from trigonal planar and (N?B) dative bond stabilized tetrahedral boron-containing compounds
(Springer, 2023) Kilic, Ahmet; Soylemez, Rahime; AkdemIr, Murat; Kivrak, Hilal DemIr; Kaya, Mustafa; Horoz, Sabit
The present study has revealed that C40H38B2Cl2N4O6, a boron-containing compound, exhibits exceptional electrochemical performance when utilized as an electrode in supercapacitor applications. The specific capacitance values of C40H38B2Cl2N4O6 were found to be significantly higher than that of the traditional electrode material, C15H14BNO2 center dot HCl, in both KOH and Na2SO4 electrolyte solutions. In particular, when tested in KOH, the specific capacitance value of C40H38B2Cl2N4O6 was a staggering 3.74 times greater than that of C15H14BNO2 center dot HCl, demonstrating its exceptional energy storage capabilities. The superior performance of C40H38B2Cl2N4O6 can be attributed to its unique porous structure and high surface area, which enhances its ability to store charge. This research serves as a significant step towards the development of more advanced energy storage devices, and paves the way for C40H38B2Cl2N4O6 to be employed as a promising material in future supercapacitor applications.
Boron-containing compounds as a new candidate for supercapacitor electrode: simplified synthesis and structural identification properties
(Elsevier Science Inc, 2023) Akdemir, Murat; Kivrak, Hilal Demir; Kilic, Ahmet; Beyazsakal, Levent; Kaya, Mustafa; Horoz, Sabit
In this study, the performance of two boron-containing compounds, C14H14BNO2 center dot HCl (BCC1) and C38H38B2Cl2N4O4 (BCC2), as electrodes in supercapacitor applications was investigated in the presence of Na2SO4 and KOH electrolyte solutions. The specific capacitance values of the compounds were compared, and the results showed that trivalent boron (BCC1) exhibited higher specific capacitance values than tetravalent boron (BCC2) in both electrolyte solutions. In the presence of Na2SO4 electrolyte solution, the specific capacitance values of the trivalent (BCC1) and tetravalent (BCC2) boron compounds at a current density of 0.75 A/g were 135.21 and 94.87 F/g, respectively, while in the presence of KOH electrolyte, the specific capacitance values of the trivalent (BCC1) and tetravalent (BCC2) boron compounds at a current density of 0.75 A/g capacitance values were determined as 106.62 and 88.25 F/g, respectively. The cycling stability of the electrodes was also studied, and it was found that the capacitance of BCC1 electrode increased gradually over the cycles, while the capacitance of BCC2 electrode decreased. The study suggests that trivalent boron can be a promising material for supercapacitor applications. However, further research is required to optimize the cycling stability of the electrodes and understand the underlying mechanism.
Conversion of CO2 into cyclic carbonates in the presence of metal complexes as catalysts
(Science Reviews 2000 Ltd, 2010) Kilic, Ahmet; Durgun, Mustafa; Ulusoy, Mahmut; Tas, Esref
The sterically hindered salicylaldimine ligands N,N'-(1,5-diaminonaphthalene)-3,5-bu(2)(t)-salicylaldimine (L-1), N,N'-(2,7-diaminofluaren)-3,5-bu(2)(t)-salicylaldimine (L-2) and N,N'-(1,8-diaminonaphthaline)-3,5-bu(2)(t)-salicylaldimine (L-3) have been synthesised by the condensation of 1,5-diaminonaphthalene, 2,7-diaminofluarene, and 1,8-diaminonaphthaline with 3,5-di-tert-butylsalicylaldehyde, respectively. Dinuclear M(II) complexes of L-1 and L-2 and mononuclear M(II) complexes of L-3 have been prepared using Cu(II), Ni(II), Co(II), and Mn(II) salts and characterised. The synthesised sterically-hindered, salen-type complexes were tested as catalysts for the formation of cyclic carbonates from CO2 and liquid epoxides (propylene oxide, epichlorohydrine, 1,2-epoxybutane and styrene oxide), which served as both reactant and solvent. Ligand structure and the type of metal centre have a marked influence on the catalytic activity. Mn(II) complexes showed the highest catalytic activity.
Design, spectroscopic properties and effects of novel catechol spiroborates derived from Schiff bases in the antioxidant, antibacterial and DNA binding activity
(Elsevier Science Sa, 2022) Kilic, Ahmet; Soylemez, Rahime; Okumu, Veysi
Novel catechol spiroborates (L(1-5)B) were prepared from the reaction of the corresponding Schiff base (L(1-5)H) ligands, boric acid, and 3,5-di-ten-butyl catechol under favorable reaction conditions. The synthesized all compounds were characterized by NMR spectra, FT-IR spectra, UV-Vis spectra, LC-MS/MS spectra, fluorescence spectra, elemental analysis as well as the melting point. The optical properties of the Schiff base ligands and catechol spiroborates were investigated using - and fluorescence spectra in the C2H5OH. The antioxidant activities of newly synthesized Schiff base ligands and their catechol spiroborates were investigated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging ability and reducing power ability. Among the synthesized catechol spiroborates, (L2B) exhibited the maximum radical scavenging (91.5 +/- 2.11%) and reducing power activity (0.654 +/- 0.015) at a concentration of 200.0 mu g/mL. Antibacterial activity was determined using 3 Gram positive and 2 Gram negative bacteria by disk diffusion method. Schiff base (L2H) was found to be effective against all test bacteria used. Besides, the DNA binding activity of the catechol spiroborates was determined using Calf Thymus DNA, and the DNA cleavage activity was determined using pBR-322 plasmid DNA by agarose gel electrophoresis method. (C) 2021 Elsevier B.V. All rights reserved.
Investigation of electrochemical properties of tri- and tetravalent boronate ester compounds for supercapacitor applications
(Springer Heidelberg, 2022) Akdemir, Murat; Hansu, Tulin Avci; Kilic, Ahmet; Beyazsakal, Levent; Kaya, Mustafa; Horoz, Sabit
The motivation of the current study is to use the synthesized tri- and tetravalent boronate esters (C15H16BNO3 center dot HCl(B-1) and C40H42B2Cl2N4O4, (B-2)), respectively, for the first time as electrodes in the presence of different electrolyte solutions in supercapacitor applications and to measure their specific capacitances. As a result of the electrochemical measurements, it is determined by experimental observations that the specific capacitance value of the tetravalent (B-2) electrode is higher than that of trivalent (B-1) in the presence of both different electrolyte solutions. Furthermore, when the morphological properties of both materials are examined, it is observed that tetravalent boronate ester (B-2) has a more porous structure and its surface area is higher than trivalent boronate ester (B-1) as a conclusion of the surface area measurement. As a consequence of this research, it has been demonstrated that tetravalent boronate ester (B-2) can be employed as a promising material for future supercapacitor energy storage applications.
Preparation and spectral studies of boronate ester modified magnetite iron nanoparticles (Fe3O4@APTES-B) as a new type of biological agents
(Elsevier, 2022) Kilic, Ahmet; Karatas, M. Emin; Beyazsakal, Levent; Okumus, Veysi
We have designed two novel magnetite targeting biological agents (Fe3O4@APTES-B-(1,B-2)) with a core of Fe3O4 and a shell made of boronate esters (APTES-B) to improve the biological effectiveness of magnetite Fe3O4 nanoparticles (MNPs). Initially, two boronate esters (B-1) and (B-2) have been prepared by 3,4dihydroxybenzaldehyde and phenylboronic acid and/or butylboronic acid using a Dean-Stark apparatus to remove the water formed during the esterification reactions. Then, the APTES-B-1,(2) compounds have been synthesized via boronate esters and APTES in the presence of 1-2 drops of formic acid as catalyst. Finally, magnetite Fe3O4 NPs were added to APTES-B-1,B-2 compounds to afford boronate ester modified magnetite iron nanoparticles (Fe3O4@APTES-B-1,B-2) at ambient temperature, respectively. The boronate esters (B-1) and (B-2), APTES-B-1,B-2 compounds, and boronate ester modified magnetite iron nanoparticles (Fe3O4@APTES-B-1,B-2) were characterized using a combination of NMR (H-1, C-13, and B-11), FT-IR, UV-Vis, LC-MS/MS, elemental analysis (CHN), XRD, SEM-EDX, EDX mapping, BET, and TG-DTA). Then, the antioxidant, antimicrobial and DNA binding activities of newly synthesized target compounds were tested. These results suggest that all compounds are also one of the propitious drug candidates and are worthy of further investigation. (C) 2022 Elsevier B.V. All rights reserved.
Preparation and spectroscopic properties of bioactive 1, 2, 3-triazole-linked boronate esters for use in antioxidant, antimicrobial, and DNA binding studies
(Elsevier Science Sa, 2023) Kilic, Ahmet; Alshhab, Anas; Okumus, Veysi
In this article, the preparation, spectral evaluation, and biological studies of bioactive 1, 2, 3-triazole-linked boronate esters are reported. The bioactive 1, 2, 3-triazole group linked-boronate esters have been designed and obtained by azido-functionalized boronate ester with different alkyne molecules via click chemistry approach under mild conditions. The prepared boronate esters (B 1-5 ) were characterized us-ing NMR ( 1 H, 13 C, and 11 B) spectra, FT-IR spectra, UV-Vis spectra, LC-MS/MS spectra, elemental analy-sis, and melting point measurement techniques. After all structures of synthesized boronate esters were characterized in detail, the antimicrobial (antioxidant and antibacterial) and DNA binding properties of newly prepared boronate esters were investigated. The bioactive 1, 2, 3-triazole-linked boronate ester (B 5 ) showed the highest radical scavenging (71.59 +/- 1.85%) and reducing power activity (0.476 +/- 0.01) at 200.0 mu g/mL concentration. According to the method of reducing power activity, the compound (B 5 ) exhibited the strongest activity with 0.476 +/- 0.014. The anti-bacterial activity of all boronate esters (B 1-5 ) was determined with four pathogenic bacteria. It was determined that only the 1, 2, 3-triazole-linked boronate ester (B 5 ) showed low activity against two bacteria (8 mm for S. aureus and 10 mm for E. hirae), while other boronate esters were found to have no activity. According to electrophoresis results using calf thymus DNA (CT-DNA), 1, 2, 3-triazole-linked boronate esters (B 3-5 ) were determined to have DNA binding activity. (c) 2023 Elsevier B.V. All rights reserved.
Synthesis of cis-1,2-diol-type chiral ligands and their dioxaborinane derivatives: Application for the asymmetric transfer hydrogenation of various ketones and biological evaluation
(Wiley, 2020) Kilic, Ahmet; Balci, Tubba Ersayan; Arslan, Nevin; Aydemir, Murat; Durap, Feyyaz; Okumu, Veysi; Tekin, Recep
Two cis-1,2-diol-type chiral ligands (T-1 and T-2) and their tri-coordinated chiral dioxaborinane (T(1-2)B(1-2)) and four-coordinated chiral dioxaborinane adducts with 4-tert-butyl pyridine sustained by N -> B dative bonds (T(1-2)B(1-2)-N) were synthesized and characterized by various spectroscopic techniques such as NMR (H-1, C-13, and B-11), FT-IR and UV-Vis spectroscopy, LC-MS/MS, and elemental analysis. It was suggested that both ferrocene and trifluoromethyl groups played key roles in the catalytic and biological studies because they could tune the solubility of the chiral dioxaborinane complexes and adjust the strength of intermolecular interactions. To assess the biological activities of newly synthesized chiral dioxaborinane compounds, DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging, reducing power, antibacterial, DNA binding, and DNA cleavage activities were tested. Then, all chiral dioxaborinane complexes were investigated as catalysts for the asymmetric transfer hydrogenation of various ketones under suitable conditions. The results indicated that the chiral dioxaborinane catalysts performed well with high yields.
Synthesis of new boron complexes: application to transfer hydrogenation of acetophenone derivatives
(Wiley-Blackwell, 2011) Kilic, Ahmet; Kayan, Cezmi; Aydemir, Murat; Durap, Feyyaz; Durgun, Mustaf; Baysal, Akin; Tas, Esref
Two new boron complexes were synthesized from N-[3-(methylmercapto)aniline]-3,5-di-tert-butylsalicylaldimine (LH) with boron reagent BPh3 or BF3 center dot Et2O. These boron complexes are stable and easily soluble in protic solvents such as ethanol (C2H5OH) but hardly soluble in nonprotic solvents such as chloroform (CHCl3), dichloromethane (CH2Cl2) and tetrahydrofuran (THF). All new boron complexes have been fully characterized by both analytical and spectroscopic methods. The catalytic activities of complexes [LBPh2], 2, and [LBF2], 3, in the transfer hydrogenation of acetophenone derivatives were tested. Stable boron complexes were found to be efficient catalysts in the transfer hydrogenation of aromatic ketones in good conversions up to 99% in the presence of iso-PrOH/KOH. Copyright (C) 2011 John Wiley & Sons, Ltd.
Synthesis, characterization and electro-spectroelectrochemical studies of four macrocyclic Schiff-base Co(II) complexes having N2O2 set of donor atoms
(Springer, 2009) Yilmaz, Ismail; Ilhan, Salih; Temel, Hamdi; Kilic, Ahmet
Four macrocyclic Schiff-base cobalt complexes, [CoL1][NO3](2) center dot A 3H(2)O, [CoL2][NO3](2) center dot A 4H(2)O, [CoL3][NO3](2) center dot A 4H(2)O and [CoL4][NO3](2) center dot A 2H(2)O, were synthesized by reaction of salicylaldehyde derivatives with 1,4-bis(3-aminopropoxy)butane or (+/-)-trans-1,2-diaminocyclohexane and Co(NO3)(2) center dot A 6H(2)O by template effect in methanol. The metals to ligand ratio of the complexes were found to be 1:1. The Co(II) complexes are proposed to be tetrahedral geometry. The macrocyclic Co(II) complexes are 1:2 electrolytes as shown by their molar conductivities (I >(M)) in DMF (dimethyl formamide) at 10(-3) M. The structure of Co(II) complexes is proposed from elemental analysis, Ft-IR, UV-visible spectra, magnetic susceptibility, molar conductivity measurements and mass spectra. Electrochemical and thin-layer spectroelectrochemical studies of the complexes were comparatively studied in the same experimental conditions. The electrochemical results revealed that all complexes displayed irreversible one reduction processes and their cathodic peak potential values (E (pc)) were observed in around of -1.14 to 0.95 V. It was also seen that [CoL1][NO3](2) center dot A 3H(2)O and [CoL2][NO3](2) center dot A 4H(2)O exhibited one cathodic wave without corresponding anodic wave but, [CoL3][NO3](2) center dot A 4H(2)O and [CoL4][NO3](2) center dot A 2H(2)O showed one cathodic wave with corresponding anodic wave, probably due to the presence of different ligand nature even if the complexes have the same N2O2 donor set. In view of spectroelectrochemical studies [CoL3][NO3](2) center dot A 4H(2)O showed distinctive spectral changes in which the intensity of the band (lambda A = at 316 nm, assigned to n -> pi* transitions) decreased and a new broad band in a low intensity about 391 nm appeared as a result of the reduction process based on the cobalt center in the complex.
Synthesis, Spectral Characterization and Electrochemical Investigations of Mononuclear Cu (II), Ni (II) and Co (II) Metal Complexes Containing Different New vic-dioxime Groups
(Taylor & Francis Inc, 2009) Tas, Esref; Kara, Hatice; Durgun, Mustafa; Kilic, Ahmet; Yilmaz, Ismail
Three new vic-dioxime: N-(2-methyl-2-butylamine)-anti-p-tolylglyoxime (L1H2), N-(4-amino-2,2,6,6-tetramethylpiperidine)-anti-p-tolylglyoxime (L2H2) and N,N'-(4-amino-2,2,6,6-tetramethylpiperidine)-anti-glyoxime (L3H2) were prepared by the reaction of anti-p-tolylchloroglyoxime and anti-dichloroglyoxime with 2-methyl-2-butylamine and 4-amino-2,2,6,6-tetramethylpiperidine in absolute THF at -15 degrees C. Mononuclear metal complexes with a metal-ligand ratio of 1:2 were prepared using Cu(II), Ni(II) and Co(II) salts. FT-IR spectra show that the ligands act in a tetradentate manner and coordinates N4 donor groups of ligands to Cu(II), Ni(II) and Co(II) ions. The Cu(II) complexes of these ligands are proposed to be square-planar; the Ni(II) and Co(II) complexes are proposed to be octahedral with two water molecules as axial ligands. The ligands and their metal complexes were characterized by elemental analyses, Ft-IR, UV-Vis, 1H and 13C-NMR spectra, magnetic susceptibility measurements and cyclic voltammetry. The electrochemical behavior of the Ni(II), Co(II) and Cu(II) complexes was investigated by cyclic voltammetry in DMSO as well.
The orthopalladation dinuclear [Pd(L1)(?-OAc)]2, [Pd(L2)(?-OAc)]2 and mononuclear [Pd(L3)2] complexes with [N, C, O] or [N, O] containing ligands: Synthesis, spectral characterization, electrochemistry and catalytic properties
(Elsevier Science Sa, 2010) Kilic, Ahmet; Kilinc, Dilek; Tas, Esref; Yilmaz, Ismail; Durgun, Mustafa; Ozdemir, Ismail; Yasar, Sedat
Treatment of the salicylaldimine ligands (L1H, L2H, L3H, L4H and L5H) with palladium(II) acetate in absolute ethanol gave the orthopalladation dinuclear [Pd(L-1)(mu-OAc)](2), [Pd(L-2)(mu-OAc)](2) and mononuclear [Pd(L-3)(2)] with the tetradentate ligands [N, C, O] or [N, O] moiety. The ligands L1H and L2H are coordinated through the imine nitrogen and aromatic ortho carbon atoms, whereas the ligand L3H coordinated through the imine nitrogen and phenolic oxygens atoms. The Pd(II) complexes have a square-planar structure and were found to be effective catalysts for the hydrogenation of both nitrobenzene and cyclohexene. These metal complexes were also tested as catalysts in Suzuki-Miyaura coupling of aryl bromide in the presence of K2CO3. The catalytic studies showed that the introduction of different groups on the salicyl ring of the molecules effected the catalytic activity towards hydrogenation of nitrobenzene and cyclohexene in DMF at 25 and 45 degrees C. The Pd(II) complexes easily prepared from cheap materials could be used as versatile and efficient catalysts for different C-C coupling reactions (Suzuki-Miyaura reactions). The structure of ligands and their complexes was characterized by UV-Vis, FT-IR, H-1 and C-13 NMR, elemental analysis, molar conductivity, as well as by electrochemical techniques. (C) 2009 Elsevier B.V. All rights reserved.
The preparation and characterization of the novel mono-/binuclear boron-based materials for supercapacitor electrode applications
(Springer Int Publ Ag, 2022) Hansu, Tulin Avci; Kilic, Ahmet; Soylemez, Rahime; Akdemir, Murat; Kaya, Mustafa; Horoz, Sabit
The goal of this research is to employ synthesized mono- and binuclear boron-containing compounds (C16H12BF6NO2 center dot HCl (B) and C42H34B2Cl2F12N4O4 (B <- N)) as electrodes in supercapacitor applications for the first time and test their specific capacitances in the presence of various electrolyte solutions. Experimental findings show that the specific capacitance value of the binuclear boron-based (B <- N) electrode is larger than that of the mononuclear boron-based (B) electrode in the presence of both distinct electrolyte solutions as a consequence of the electrochemical tests. Moreover, when the morphological qualities of both substances are evaluated, it is discovered that binuclear boron-based (B <- N) has a more porous structure and, as a result of the surface area measurement, has a greater surface area than mononuclear boron-based (B). As a part of this experiment, it has been established that binuclear boron-based (B <- N) is a viable material for future supercapacitor energy storage applications.

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