DSpace Arşivi :: by Yazar "Mercimek, Bedrettin" değerine göre listeleniyor

Yazar "Mercimek, Bedrettin" seçeneğine göre listele

Listeleniyor 1 - 14 / 14

Antibacterial activity, electrochemical modification and surface characterization of 2-((2-hydroxy-ethylimino)-methyl)benzene-1,4-diol
(SILA SCIENCE, 2012) Mulazimoglu, Aysen Demir; Mercimek, Bedrettin
In this paper, the Schiff base ligand, 2((2-hydroxy-ethylimino)-methyl)benzene-1,4-diol (H3L'), was synthesized and characterized by elemental analysis, FT-IR and H-1-NMR. Electrochemical behaviors were investigated on the glassy carbon electrode (GCE) surface with cyclic voltammetric (CV) technique. The modification of H3L' on the GCE was performed in -100/+2600 mV potential range using 100 mV s(-1) sweep rate with 10 cycles. For the characterization of the modified surface 1 mM ferrocene redox probe in 0.1 M tetrabutylammonium tetrafluoroborate (TBATFB) in acetonitrile (MeCN) was used. The Schiff base was screened for in-vitro antibacterial activity against Bacillus cereus, Escherichia coli, Bacillus subtilis, Streptococcus mutans and Staphylococcus aureus. Antibacterial activity was assessed using disc diffusion method. The formed inhibition zones were measured.
A comparative study for lipase immobilization onto alginate based composite electrospun nanofibers with effective and enhanced stability
(ELSEVIER, 2017) Dogac, Yasemin Ispirli; Deveci, Ilyas; Mercimek, Bedrettin; Teke, Mustafa
In this study, lipase was successfully immobilized on polyvinyl alcohol/alginate and polyethylene oxide/alginate nanofibers that were prepared by electrospinning. Results showed that nanofibers (especially polyvinyl alcohol/alginate) enhanced the stability properties of lipase. When the free lipase lost its all activity after 40-60 min at high temperatures, both lipase immobilized nanofibers kept almost 65-70% activity at the same time. The lipase immobilized poly vinyl alcohol/alginate and polyethylene oxide/alginate nanofibers protected approximately all of their activities until pH 9. Lipase immobilized polyvinyl alcohol/alginate and polyethylene oxide/alginate nanofibers maintained 60% of their activities after 14 and 7 reuses, respectively. The morphology of nanofibers was characterized by Scanning Electron Microscope, Fourier Transform Infrared Spectroscopy and Thermal Gravimetric Analyzer. As a result, this nanofiber production method, electrospinning, is simple, versatile and economical for preparing appropriate carrier to immobilize the enzymes. (C) 2016 Elsevier B.V. All rights reserved.
Effect of Temperature on Separation of Purine and Pyrimidine Bases on Novel Chelating Resin
(Elsevier Science Bv, 2002) Ayar, Ahmet; Mercimek, Bedrettin; Kara, Hüseyin; Çengeloğlu, Yunus
The novel chelating resin poly-bis [4-(4'-biphenyl)oxamidine]-diaminoglyoxime (PLH2) has been modified as ligand-exchange material with Co(II). The possibility of using PLH2 as ligand exchanger in the chromatographic separation of nucleic acid bases and nucleosides has been studied at various temperatures. PLH2 offers the advantage of combining high sorption capacity with high selectivity for the ligands. It has a strong driving force for ligand sorption. Ligand-exchange chromatography on Co(II)-loaded functionalized PLH2 can be a useful alternative method for separation of nucleic acid bases and nucleosides.
Oksamidinlerin vic-dioksimli türevlerinin sentezi ve geçiş metalleri ile komplekslerinin incelenmesi
(Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 1994) Mercimek, Bedrettin; İrez, Gazi
Bu çalışmada, literatürde bulunmayan altı adet yeni ligand ve bunlarin bazı geçiş metalleri ile kompleksleri sentezlendi. Bu ligandlar; 2,3-Di(4-metilfenilamin)-5,6- bis(hidroksiimino)pirazin (TPGHg), 2,3-Difenilamin-5,6-bis(hidroksiimino)pirazin (APGH2), bis(A2-2-imidazolinil)-5,5*-dioxime (B1GH2), bisC^-S-pirimidiniO-e.e'-dioxime (BPGH2), polimerik-bis[N,N'-bis(4-aminofenil)oksamidin]glioksim (PFGHg) ve polimerik-bis{N,N'- bis[4-(4'-aminobifenil)]oksamidin}glioksim (PBFGHg) dir. Çalışmanın birinci kademesinde, N,N'-bis(4-metilfenil)oksamidin ve N,N'- bis(fenil)oksamidin ile disiyan-di-N-oksit'in reaksiyonu sonucu TPGHg ve APGHg vj£- dioksim ligandları sentezlendi. TPGHg ve APGHg ligandlarmın Ni(ll), Co(Il) ve Cu(ll) iyonları ile metal-ligand oranı 1:2 olan mononûkleer kompleksleri izole edildi. Çalışmanın ikinci kademesinde, bis(â2-2-imidazolinil)'in disiyan- di- N- oksit ile reaksiyonu sonucu BIGHg ve bis(û2-2-pirimidinil)'m anli-diklorglyoksim ile reaksiyonlan sonucu BPGH2 yic-dioksim liganları sentezlendi. BİGHg ve BPGHg ligandları ile Ni(ll), Co(Il) nin alkol-su karışımı veya alkollü çözeltileri ve Cu(Il) nin alkol-su karışımı çözeltilerinden, metal -ligand oranı 1:2 olan mononükleer kompleksler elde edilmesine karşılık; Cu(Il)'nin susuz ortandaki çözeltisi ile, metal-ligand oranı 3:2 olan trinükleer kompleksler elde edildi. Mononükleer Ni(ll) ve Co(ll) komplekslerinin susuz ortanda Cu(Il) ile reaksiyonu sonucu, heterotrinükleer kompleksler elde edildi. Yine BİGHg ve BPGHg ile Zn(Il) ve Hg(Il)'nm alkol-su kanşımı veya alkolü çözeltileri ve Cd(II)'nin alko-su kanşımılı çözeltilerininden, metal ligand oranı 1:1 olan, mononükleer kompleksler elde edilmesine karşılık; Cd(II)'nin susuz ortamdaki çözeltisi ile, metal-ligand oranı 3:1 olan trinükleer kompleksler elde edildiği görüldü. N,N'-Bis(4-aminofenil)oksamidin ve N,N'-bİs-[4-(4'-aminobifenil)]oksamidin ile anii-diklorglyoksim'in reaksiyonu sonucu, PFGHg ve PBFGHg Iigandlan sentezlendi. PFGH2'nin ve PBFGH2'nin, Ni(Il), Co(Il) ve Cu(II) metalleri ile, metal-ligand oranı 1:2 olan polinükleer kompleksleri izole edildi. Sonuç olarak, literatürde kaydına rasrlanmayan altı yeni ligand ve otuziki kompleks izole edildi. Bunların yapılan, ty-NMR, İR spectroskopisi, elementel analiz ve mağnetik süsebtibilite teknikleri ile aydınlatıldı.
Preparation of New Benzoylthiourea-functionalized PVC Resin and Investigation of the Complexation Properties
(SPRINGER, 2009) Kurt, Guelsah; Mercimek, Bedrettin
Poly(vinyl chloride) (PVC) have been modified, using a two-step process with amine and benzoyl isothiocyanate groups. In the present paper, PVC-N,N'-(3,3'-(ethane-1,2-diyl bis(azanediyl))bis (propane-3,1-diyl))bis(azanediyl)bis(thioxomethylene) dibenzamide one have been synthesized. Its complexes have been prepared with CoCl(2), NiCl(2), PtCl(2) and HgCl(2). These compounds have been characterized by elemental analysis, FT-IR, UV-VIS, TGA, SEM, (I)H NMR.
The Synthesis and Ni(Ii), Co(Ii) and Cu(Ii) Complexes of 2,3-Di(4-Methylphenylamine)-5,6-Bis(Hydroxyimino)Pyrazine and 2,3-Diphenylamine-5,6-Bis(Hydroxyimino)Pyrazine
(MARCEL DEKKER INC, 1994) Mercimek, Bedrettin; İrez, Gazi
In this study, two new vic-dioxime compounds and their transition metal complexes were synthesized. The vic-dioximes are 2.3-di(4-methylphenylamine)-5,6-bis(hydroxyimino)pyrazine (TPGH2) and 2,3-diphenylamine-5,6-bis(hydroxyimino)pyrazine (APGH2). The complexes of these vic-dioximes with Ni(II), Co(II) and Cu(II) metal ions are investigated. Their structures were identified by elemental analyses and H-1-NMR, IR spectroscopy, respectively.
The Synthesis and Ni(Ii), Co(Ii) and Cu(Ii) Complexes of Three New Unsymmetrical Vic-Dioximes
(MARCEL DEKKER INC, 1995) Deveci, M. All; Irez, Gazi; Mercimek, Bedrettin; Bedük, A. Dinçer; Sarıkavaklı, Nursabah
The reaction of anti-chlorophenylglyoxime with suitable alkylamines in ethanol-water at 0 degrees C gives the unsymmetrical vic-dioximes, namely, N-ethylaminophenylglyoxime (L(1)H(2)), N-propylaminoglyoxime (L(2)H(2)) and N-butylaminoglyoxime (L(3)H(2)). The Ni(li) and Cu(II) complexes of these ligands are square-planar while the Co(II) complexes are octahedral with water molecules as axial ligands. The structures of these complexes are proposed based on elemental analyses, IR and magnetic susceptibility measurements.
Synthesis and Ni(Ii), Co(Ii) and Cu(Ii) Complexes of Two New Polymeric Bis (Oxamidine) Aminoglyoximes
(Marcel Dekker Inc, New York, Ny, United States, 1995) Mercimek, Bedrettin; İrez, Gazi
In this work, two new polymeric Bis(oxamidine)diaminoglyoximes were synthesized by reacting anti-dichloroglyoxime with sym-bis(p-amino-phenyl)oxamidine and sym-bis-4-(4?-aminobiphnyl)oxamidine, and complexes of these vic-dioximes with Ni(II), Co(II) and Cu(II) were isolated. All these complexes are insoluble in common solvents; structures are proposed according to elemental analysis, i.r., and magnetic susceptibility measurements.
The Synthesis and Ni(II), Co(II), Cu(II), Zn(II), and Cd(II) Complexes of Two Novel Tetraoximes
(1995) Mercimek, Bedrettin; İrez, Gazi; Deveci, M. Ali; Bedük, A. Dinçer; Sankavakh, Nursabah; Uçan, H. İsmet
In this study, two novel tetraoximes were synthesized by reacting anti-chlorogly-oxime with sym-bis(p-aminophenyl)oxamidine and sym-bis-4-(4‘-aminobiphnyl)oxamidine. Polynuclear complexes with Ni(II), Co(II) and Cu(II) and binuclear complexes with Zn(II) and Cd(II) of these tetraoximes were isolated. All these complexes are insoluble in common solvents; structures are proposed according to elemental analysis, i.r., and magnetic susceptibility measurements. © 1995, Taylor & Francis Group, LLC. All rights reserved.
The Synthesis and Ni(Ii), Co(Ii), Cu(Ii), Zn(Ii), Cd(Ii) and Uo2(Vi) Complexes of N,N'-Bis(2-tolyl)Diaminoglyoxime and N,N'-Bis(4-tolyl)Diaminoglyoxime
(MARCEL DEKKER INC, 1995) Mercimek, Bedrettin; Özcan, Emine; Pekacar, All İhsan
N,N'-Bis(2-toyl)diaminoglyoxime (L(1)H(2)) and N,N'-bis(4-tolyl)diaminoglyoxime (L(2)H(2)) have been prepared from anti-dichloroglyoxime with o-toluidine and p-toluidine in ethanol. The complexes of these vic-dioximes with Ni(II), Co(II), Cu(II), Zn(II), Cd(II) and UO2(VI) metal ions have been investigated. The nickel(II), cobalt(ll) and copper(ll) complexes of the ligands have a metal-ligand ratio of 1:2 and the ligand oo-ordinates through the N atoms, as do most of the vic-dioximes. [Zn(LH)Cl(O-2)] and [Cd(LH)CI(H2O)] (LH(2) = L(1)H(2) or L(2)H(2)) form six-membered chelate rings and co-ordinate through N and O atoms. LH(2) reacts with UO2(CH3COO)(2) . 2H(2)O to give binuclear complexes with a metal-ligand ratio of 1:1. Their structures were identified by elemental analyses and H-1 NMR, IR, UV-visible spectroscopy, respectively.
The Synthesis of Four New Bis(Amino-P-Chlorophenylglyoximes) and Their Polymeric Complexes
(MARCEL DEKKER INC, 1997) Pekacar, Ali İhsan; Mercimek, Bedrettin; Özcan, Emine
In this study, four new bis(amino-p-chlorophenylglyoximes), 1,2-phenylenebis(amino-p-chlorophenylglyoxime) L(1)H(2), 1,5-naphthylenebis(amino-p-chlorophenylglyoxime) L(2)H(2), 3,4-tolylenebis(amino-p-chlorophenylglyoxime) L(3)H(2), and 2,6-pyridylbis(amino-p-chlorophlenylglyoxime) L(4)H(2), have been synthesized from anti-p-chlorophenylchloroglyoxime and the corresponding aromatic diamines. Their polymeric complexes with Ni(II), Co(II) and Cu(II) have been prepered. The Ni(II) and Cu(II) complexes of these ligands have been found to be square-planar, while the Co(II) complexes are octahedral with water molecules as axial ligands. H-1 NMR, AAS, IR, magnetic susceptibility and elemental analytical data of the complexes and ligands are discussed.
Synthesis, characterization, and antimicrobial activity of new benzoylthiourea ligands
(VERSITA, 2009) Kurt, Guelsah; Sevgi, Fatih; Mercimek, Bedrettin
In this study, new benzoylthiourea derivatives, (E)-N-[(2-benzamidomethyleneamino)ethylcarbamothioyl]benzamide H(3)L', N-(1-(3-benzoylthioureido)propan-2-ylcarbamothioyl)-benzamide H(4)LaEuro(3), (E)-N-[4-(benzamidomethyleneamino)phenylcarbamothioyl]benzamide H(3)LaEuro ', were synthesized. Structures of the compounds were identified by spectroscopic techniques. In addition, all synthesized compounds were evaluated for in vitro antibacterial and antifungal activity. Compound H(3)LaEuro ' exhibited antibacterial activity.
Synthesis, Characterizations and Investigation of Electrochemical Behaviours of 4-[(2-Hydroxyphenylimino)methyl]benzene-1,3-diol
(HINDAWI LTD, 2009) Mulazimoglu, Aysen D.; Mulazimoglu, Ibrahim Ender; Mercimek, Bedrettin
This Schiff base ligand, 4-[(2-hydroxyphenylimino)methyl]benzene-1,3-diol (HIBD) was synthesized by reaction of 2-aminophenol and 2,4-dihydroxybenzaldehyde. The ligand was characterized by elemental analysis, FT-IR and H-1-NMR. Electrochemical behaviors were investigated on the glassy carbon electrode (GC) surface with cyclic voltammetry (CV). The modification of HIBD on the GC was performed in +0.3 V and +2,8 V potential range using 100 mV s(-1) scanning rate having 5 cycle. For the characterization of the modified surfaces 1 mM ferrocene redox probe in 0,1 M tetrabutylammonium tetrafluoroborate (TBATFB) and 1 mM ferricyanide redox probe in 0.1 M H2SO4 were used.
Thermal Decomposition Kinetics of Some Metal Complexes of 2,3-Hydroxyimino-4-phenyl-6-phenyazo-1-thia-4,5-diaza-cyclohexa-5-diene
(WILEY-BLACKWELL, 2010) Dogan, Fatih; Mercimek, Bedrettin; Kaya, Ismet
The Ni(II), Cu(II) Co(II) and Zn(II) complexes of 2,3-hydroxyimino-4-phenyl-6-phenyazo-1-thia-4,5-diaza-cyclohexa-5-diene (H(2)L) were synthesized. Thermal behavior of these complexes was studied in dynamic nitrogen atmosphere by TA (thermogravimetric analysis), DTA (differential thermal analysis) and DTG (differential thermal gravimetry) techniques. The reaction order, the activation energies, the entropies, the enthalpies, the free energies, and the pre-exponential factors of the thermal decomposition reactions were calculated from the thermogravimetric curves. The kinetic analysis of the thermogravimetric data was performed by using several methods such as MacCallum-Tanner (MT), van Krevelen (vK), Madhusudanan-Krishnan-Ninan (MKN), Wanjun-Yuwen-Hen-Cunxin (WYHC), Horowitz-Metzger (HM) and Coats-Redfern method (CR) based on the single heating rate. Most appropriate methods were determined for each decomposition step according to the least-square linear regression. The Ni(II), Cu(II) Co(II) and Zn(II) complexes displayed one-or two-stage decomposition pattern when heating in a dynamic nitrogen atmosphere and metal oxides remained as end products of the complexes. The characterization of the end products of the decomposition was performed by X-ray diffraction.

Yazar "Mercimek, Bedrettin" seçeneğine göre listele

Sayfa Başına Sonuç

Sıralama seçenekleri