Yazar "Öğretir, Cemil" için listeleme
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Spectroscopic determination of acid dissociation constants of some pyridyl Shiff bases
Öğretir, Cemil; Dal, Hakan; Berber, Halil; Taktak, Fadime Fulya (American Chemical Society, 2006)The acid dissociation constants (pK(a)) of eight biologically active pyridyl Shiff bases were determined using a UV-vis spectroscopic technique at 25 +/- 0.1 degrees C. The first acidity constants (pK(a1)) of the ... -
Spectroscopic determination of acid dissociation constants of some pyridyl-substituted 2-aminothiazole derivatives
Öğretir, Cemil; Demirayak, Şeref; Tay, Naime Funda (American Chemical Society, 2006)The acid dissociation constants, K-a, of nine biologically active 2-amino-4-(x-pyridyl)- thiazole, 2-methylimino-3-methyl- 4-(x-pyridyl)- 2,3-dihydrothiazole, and 2-methylamino-4-(x-pyridyl)- 2,3-dihydrothiazole were ... -
Spectroscopic determination of acidity constants of some monoazo resorcinol derivatives
Berber, Halil; Öğretir, Cemil; Lekesiz, Emine Çiğdem Sev; Ermiş, Emel (American Chemical Society, 2008)The acidity constants, as pK(a) values, of six monoazo resorcinol derivatives were determined by the UV-visible spectroscopic technique at 25 degrees C (+/- 0.1 degrees C). The protonation and deprotonation behaviors of ... -
Spectroscopic Determination of the Acid Dissociation Constants of Some 2-Hydroxy Schiff Base Derivatives
Taktak, Fadime Fulya; Berber, Halil; Dal, Hakan; Öğretir, Cemil (American Chemical Society, 2011)In this study the acidity constants of a series of biologically active pyridyl Schiff bases were calculated from UV-visible spectrophotometric data at (25 +/- 0.1)degrees C. The first acidity constants (pK(a1)) of the ... -
Studies on solvatochromic behavior of some monoazo derivatives using electronic absorption spectra
Sidir, İsa; Tasal, Erol; Gülseven, Yadigar; Güngör, Tayyar; Berber, Halil; Öğretir, Cemil (Pergamon-Elsevier Science LTD, 2009)The electronic absorption spectra of 2',4'-dihydroxy-2-methoxyazobenzene and 4,2',4'-trihydroxyazobenzene molecules have been investigated in solvents with different polarities. The solvent dependent UV-vis spectral shifts, ... -
Susuz ortamda 2-(sübstitüe)-oksazolo [4,5-b] piridin türevlerinin potansiyometrik titrasyonu
Poyraz, Mehmet (Anadolu Üniversitesi, 1992)2-(sübstitüe)-oksazolo [4,5-6] piridin türevlerinin nitrobenzen ve asetonitril içindeki pKa ları tayin edilmiştir. Nitrobenzenle yapılan çalışmada titre edici olarak nitrobenzende hazırlanmış susuz perklorik kullanılmıştır. ... -
Synthesis, characterization, tautomerism and theoretical study of some new Schiff base derivatives
Türkoğlu, Gülsen; Berber, Halil; Dal, Hakan; Öğretir, Cemil (Pergamon-Elsevier Science LTD, 2011)New Schiff base derivatives were prepared by the condensation of 5-chloro and 5-bromo salicylaldehyde with bis(o-aminophenol)ethers. Five bis(o-nitrophenol)ether compounds were synthesized using some ditosylate, ... -
A theoretical approach to acidity-basicity behaviour of some biologically active 6-phenyl-4,5-dihydro-3(2H)-pyridazinone derivatives
Öğretir, Cemil; Yarlıgan, S; Demirayak, Şeref; Arslan, T (Elsevier Science BV, 2003)The acid dissociation constants, pK(a) values, of 12 biologically active 6-[p- or p- and m-substituted] phenyl-4,5-dihydro-3(2H)-pyridazinone derivatives were computed using semi-empirical methods. Correlations between the ... -
A theoretical search on metal-ligand interaction mechanism in corrosion of some imidazolidine derivatives
Öğretir, Cemil; Çalış, S; Bereket, G; Berber, Halil (Elsevier Science BV, 2003)The interaction mechanism of some imidazolidine derivatives with metallic Zn in gas phase, using semiempirical methods, was studied at elevated temperature and the obtained data were used to search a possible correlation ... -
Theoretical studies on the structure of [(1-aza-2-benzimidazol-2-ylprop-1-enyl)amino]aminomethane-1-thione
Poyraz, Mehmet; Berber, Halil; Öğretir, Cemil (Arkat Usa Inc, 2007)The tautomerisation and acid-base properties of [(1-aza-2-benzimidazol-2-ylprop-1-enyl) amino]aminomethane-1-thione were studied both in the gas and aqueous phase to elucidate the structure of this compound. The computed ... -
A theoretical study of substituent effects on tautomerism of 2-hydroxybenzimidazoles
Öğretir, Cemil; Yarlıgan, S; Berber, Halil; Arslan, T; Topal, S (Springer-Verlag, 2003)The geometries, relative stabilities of some 4(7) and 5(6) substituted 2-hydroxybenzimidazole derivatives were calculated with full geometry optimization using AM1 and PM3 in aqueous phase. With the exception of molecules ... -
A Theoretical Study on Proton-Gain Behaviors of Some Azaindole Derivatives
Çalış, Sevgül; Berber, Halil; Uysal, Ülkü Dilek; Öğretir, Cemil (Anadolu Üniversitesi, 2011)The acidities, relative stabilities (RS), nucleophilicities (Ƞ ) and proton affinities (PA) of seven azaindole molecules were determined in both gas and liquid phases using semi-empirical AM1, PM3 and PM5 methods. The ...