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Öğe 2-[(pridin-2-il-metilen)amino] pridin-3-ol'ün sentezi, polimerizasyonu ve bazı fiziksel özelliklerinin incelenmesi(Çanakkale Onsekiz Mart Üniversitesi, 2005) Çulhaoğlu, Süleyman; Kaya, İsmet2-[(pridin-2-il-metilen)amino]pridin-3-ol'ün oksidatif polikondenzasyon reaksiyon şartlan ve ürünlerin özellikleri incelendi. 2-[(pridin-2-il- metilen)amino]pridin-3-orün oksidatif polikondenzasyon reaksiyonu bazik ortamda 50-90 °C arasında yapıldı. 2-[(pridin-2-il-metilen)amino]pridin-3-orün oksidatif polikondenzasyon reaksiyonunda oksitleyici olarak NaOCl, IfeOa ve hava oksijeni kullanıldı. Ürünlerin yapı ve özellikleri FT-IR, 'H-NMR, DTA-TG, SEÇ teknikleri kullanılarak belirlendi. Anahtar Kelimeler: Oligo-2-[(pridin-2-il-metilen)amino]pridin-3-ol, Oksidatif polikondenzasyon, Schiff Bazı.Öğe Ana zincirinde fluoren molekülü içeren yeni tür schiff bazı sübstitüentli oligofenollerin sentezi ve bazı özelliklerinin incelenmesi(2009) Kaya, İsmet; Bahçeci, Şenol Dilek; Çulhaoğlu, Süleyman; Yıldırım, Mehmet; Aydın, Aysel; Kamacı, Musa; Avcı, Ali[Abstract Not Available]Öğe Fonksiyonel poliazometinlerin sentezi ve karakterizasyonu(Çanakkale Onsekiz Mart Üniversitesi, 2010) Çulhaoğlu, Süleyman; Kaya, İsmetBu çalışmada fonksiyonel poliazometin grubu içinde yer alan 21 adet poliazometin eter sentezlenmiştir. Sentezlenen poliazometinlerin yapı analizleri, termal özellikleri ve elektriksel iletkenlikleri araştırıldı. Bu nedenle yapılarında çift aktif grup taşıyan aldehit ve amin bileşikleri DMF çözücü ortamında brom eliminasyonu ile sentezlendi. Poliazometin eterlerin verimleri %80-95 aralığında bulundu. Sentezlenen monomer ve polimerlerin yapıları, FT-IR, 1H-NMR, DTA-TG, DSC ve elektriksel iletkenlik yöntemleri ile aydınlatıldı. 1H-NMR verilerine göre polimerizasyon sonucunda -HC=N- (azometin bağı) oluşurken monomerlerde bulunan -NH2 (amin) ve -CHO (karbonil) grupları da son grup olarak ürünlerin yapılarında gözlendi. Termogravimetrik analiz (TG) değerleri incelendiğinde sentezlenen poliazometin eterlerin sıcaklığa karşı dayanıklı oldukları belirlendi. Sentezlenen poliazometin eterlerin elektriksel iletkenlikleri ölçülmüş ve tipik yarı iletken özellik gösterdikleri tespit edildi. Çözünürlük test sonuçlarına göre, sentezlenen monomerlerin tümü DMF, DMSO, DMac, etil alkol, etil asetat, metil alkol, klorofom, aseton gibi polar çözücülerde çözündü. Fakat n-hegzan ve n-heptan gibi apolar çözücülerde çözünmedi. Sentezlenen poliazometin eterlerin DMSO ve DMac çözücülerinde ısı etkisiyle çözündüğü, etil alkol, etil asetat, metil alkol, klorofom, aseton gibi çözücülerde ise hiç çözünmediği bulundu. DSC verileri incelendiğinde poliazometin eterler için yumuşama sıcaklığı ve ?Cp değerlerinin sırasıyla 136-253 oC ve 0,098-0,980 J/goC aralığında olduğu belirlendi.Öğe Synthesis and characterization of novel polyazomethines containing perylene units(Elsevier Sci Ltd, 2008) Kaya, İsmet; Koyuncu, Sermet; Çulhaoğlu, SüleymanPolyazomethines including perylene units in the main chain were synthesized via polycondensation of diaminoperylene with aromatic dialdehydes. UV/vis, FT-IR, H-1 NMR, C-13 NMR and elemental analysis techniques were carried out for the characterization of the synthesized diaminoperylene, dialdehydes and polyazomethines including perylene units (PAM-PERs). The number-average molecular weight (M-n), weight-average molecular weight (M-w) and polydispersity index (PDI) values of PAM-PERs were determined by size exclusion chromatography (SEC). Thermal properties of PAM-PERs was determined by using TGA/DTA and DSC systems. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels, and electrochemical (E-g') and optical (E-g) hand gap values were calculated by using the results of cyclic voltammetry and UV/vis, respectively. Conductivity measurements of PAM-PERs were carried out with electrometer by using four-point probe technique. The conductivity was observed to be increased by doping agent iodine. (c) 2007 Elsevier Ltd. All rights reserved.Öğe Synthesis and characterization of oligo-2-[(2-hydroxymethylphenylimino) methyl] phenol and oligo-2-[(2-hydroxymethylphenylimino) methyl]-5-bromo-phenol(Tubitak Scientific & Technological Research Council Turkey, 2007) Kaya, İsmet; Ercag, Ayse; Çulhaoğlu, SüleymanOligo-2-[(2-hydroxymethylphenylimino) methyl] phenol O-(2-HMPIMP) and oligo-2-[(2-hydroxymethylphenyl imino) methyl]-5-bromo-phenol O-(2-HMPIMBP) were synthesized by the oxidative polycondensation reaction using air as an oxidant in an aqueous alkaline medium at 70 degrees C. They were characterized by H-1-NMR, FT-IR, UV-vis, TC, size exclusion chromatography (SEC) and elemental analysis. According to the SEC analyses, the number-average molecular weight (M-n), weight-average molecular weight (M-w) and polydispersity index (PDI) values of O-2-HMPIMBP and O-2-HMPIMP are 1100, 1600 g mol(-1) and 1.45; and 6000, 6250 g mol(-1) and 1.04, respectively. According to TG analyses, the weight losses of O-2-HMPIMP and O-2-HMPIMBP are 98.31% and 96.91%, respectively, at 900 degrees C.Öğe Synthesis and investigation of bis(phenyl)fluorene and carbazole appended dipodal Schiff base for fluorescence sensing towards Sn(II) ion and its regioselective polymerization(Elsevier Science Sa, 2023) Kolcu, Feyza; Çulhaoğlu, Süleyman; Kaya, İsmetOne-pot condensation reaction between 9,9-Bis(4-aminophenyl)fluorene and 9-Ethyl-9H-carbazole-3-carbalde-hyde afforded a chemosensor ((N,N ')-4,4 '-(9H-fluorene-9,9-diyl)bis(N-((9-ethyl-9H-carbazol-2-yl)methylene) aniline, SB) having Schiff base skeleton. The further step was the synthesis of the polymer (P-SB) via oxidative polycondesation reaction of SB. FT-IR, H-1 NMR and C-13 NMR instruments were used to characterize the func-tional groups on the monomer and polymer. Thermal stability and electrochemical features of SB and P-SB were characterized by thermogravimetric analysis-differential thermal analyses (TG-DTA) and cyclic voltammetry (CV), respectively. The glass transition and surface image of P-SB were determined from DSC and SEM mea-surements, respectively. UV-vis and photoluminescence spectroscopy (PL) allowed to determine the optical properties of SB and P-SB. The obtained polymer, which had the weight average molecular weight of 8400 Da identified by gel permeation chromatography (GPC), exhibited fluorescence property. The synthesized turn-on fluorogenic chemosensor SB showed high selectivity and sensitivity towards Sn2+ among the cations of Ag+, K+, Hg2+, Mn2+, Cd2+, Sn2+, Ca2+, Pb2+, Zn2+, Co2+, Ni2+, Cu2+, Fe3+, Al3+, Cr3+ and Cr6+. The fluorescence turn-on recognition process for the detection of Sn2+ was related to the restriction of C=N isomerization, fol-lowed by inhibiting intramolecular charge transfer (ICT), with consequent chelation-enhanced fluorescence (CHEF) mechanism. The stoichiometry ratio of the analyte-sensor adduct in the solution was found to be 1:1 by Job's plot method concomitant with a dramatic increase in fluorescent signal at 471 nm and a marked color change from colorless to turquoise blue upon addition of Sn2+ ions. Limit of detection value for the formation of SB-Sn2+ chelation was calculated as 3.37 nM. No change in PL intensity of SB-Sn2+ chelation was observed in the company of other metal ions. Reversibility of the chemosensor in its binding towards Sn2+ was demonstrated in the presence of chelating agent EDTA. The synthesized SB could effectively detect Sn2+ ion as a fluorescent sensor.Öğe Synthesis of phosphate and silane-based conjugated polymers derived from bis-azomethine: Photophysical and thermal characterization(Elsevier, 2021) Çulhaoğlu, Süleyman; Kolcu, Feyza; Kaya, İsmetPolyazomethines including phosphate and silane groups were studied in this work. In the first step, two Schiff base monomers, SBs with two hydroxyl functional groups were synthesized as a result of a condensation reaction between diamine and aldehyde. Then, Schiff bases were polymerized by HCl elimination between hydroxyl groups of the SBs and chlorine of phenyl dichlorophosphate (P) or dichlorodiethylsilane (Si) to obtain two different polyazomethines for each. FT-IR, 1H NMR, 13C NMR and thermal analysis were utilized to characterize the synthesized SBs, P-polyazomethines and Si-polyazomethines. The optical band gap values (Eg) of the syn- thesized P-polyazomethines and Si-polyazomethines were calculated using UV–Vis spectrophotometer. The study of solvent effects on the absorption of P-polyazomethines and Si-polyazomethines was also included into this work. Low band gaps of the synthesized polyazomethines could be evaluated as semi-conductive material for the production of electronic and optoelectronic materials. Photoluminescence (PL) measurements revealed that P–P1 gave a greenish-yellow color emission upon excitation at blue light of 480 nm with a 16.2% of quantum yield although the response of Si–P1 had white light emitting property. Besides, P–P2 had multicolor emission property and Si–P2 had white light emitting property. No obvious fluorescence changes were observed within 3600 s under the same conditions, serving as evidence of stability of PL emission of P–P1, Si–P1, P–P2 and Si–P2 to be steady along with wavelength of the exciting light. Thermal properties of the synthesized poly- azomethines indicated that they were thermal stable materials up to 300 ◦C. The residual of P-polyazomethines and Si-polyazomethines was observed between 39.8% and 64.7% at 1000 ◦C.Öğe Synthesis, characterization and antimicrobial properties of 4-[(4-hydroxybenzylidene) amino] phenol and its polymer(World Scientific Publ Co Pte Ltd, 2007) Kaya, İsmet; Çulhaoğlu, Süleyman; Şenol, DilekThe oxidative polycondensation reaction conditions of 4-[(4- hydroxybenzylidene) amino] phenol (4- HBAP) were studied with H2O2, air oxygen and NaOCl in an aqueous alkaline medium between 50 and 90 C. The structures of the obtained monomer and polymer were confirmed by FT-IR, UV-Vis, H-1- and C-13-NMR and elemental analysis. The characterization was made by TG-DTA, size exclusion chromatography (SEC) and solubility tests. At the optimum reaction conditions, the yield of poly[ 4-(4- hydroxybenzylidene amino) phenol] (P-4-HBAP) was found to be 48.3% (for H2O2 oxidant), 80.5% (for air O-2 oxidant) and 86.4% ( for NaOCl oxidant). According to the SEC analysis, the number-average molecular weight (Mn), weight-average molecular weight (Mw) and polydispersity index (PDI) values of P-4-HBAP was found to be 8950, 10970 g mol(-1) and 1.225, respectively, using H2O2; and 11610, 15190 g mol(-1) and 1.308 respectively, using air O-2 and 7900, 9610 g mol(-1) and 1.216, respectively, using NaOCl. According to TG-DTA analyses, P-4-HBAP was more stable than 4- HBAP against thermal decomposition. The weight loss of P-4-HBAP was found to be 49.27% at 1000 C. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) values calculated from electrochemical measurement. Electrochemical energy gaps (Eg ') of 4- HBAP and P-4-HBAP were found to be -5.46, -5.28; -2.26, -2.67; 3.20 and 2.61 eV, respectively. According to UV-Vis measurements, optical band gap (Eg) of 4- HBAP and P-4-HBAP were found to be 3.34 and 3.01 eV, respectively. Also, antimicrobial activities of 4- HBAP and P-4-HBAP were examined against selected some bacteria. The electrical conductivity of the polymer was measured after doping with iodine.Öğe Synthesis, characterization, conductivity and thermal degradation of oligo-2-[(4-morpholin-4-yl-phenyl)imino]methylphenol and its oligomer-metal complex compounds(Elsevier Science Sa, 2006) Kaya, İsmet; Çulhaoğlu, Süleyman; Gül, MuratSchiff base oligomer of 2-[(4-morpholin-4-yl-phenyl)imino]methylphenol (2-MPIMP) was synthesized via oxidative polycondensation reaction by using air O-2 and NaOCl oxidants in an alkaline medium between 40 and 90 degrees C. The structure of oligo-2-[(4-morpholin-4-yl-phenyl)imino]methylphenol (O-2-MPIMP) was characterized by using H-1, C-13 NMR, Fr-IR, UV-vis, size exclusion chromatography (SEC) and elemental analysis techniques. At the optimum reaction conditions, the yield of O-2-MPIMP was found to be 73% (for air 02 oxidant) and 97% (for NaOCl oxidant). According to the SEC measurements, the number-average molecular weight (M.), weight-average molecular weight (M-w) and polydispersity index (PDI) values of O-2-MPIMP was found to be 1725, 2030 mol(-1) and 1.177, respectively, using air 02 and 1345, 1490 g mol(-1) and 1.108, using NaOCl, respectively. Oligomer-metal complex compounds were synthesized from the reactions of O-2-MPIMP with Cu2(+), Co2+, Cd2+, Zn2+, Ph2+ and Zr4+ ions. Electrochemical the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO) and electrochemical energy gaps (E-g') for 2-MPIMP and O-2-MPIMP were found to be between -5.85 and -5.82, -2.63 and -2.87, 3.22 and 2.95 eV. Also, conductivity values of oligomer and oligomer-metal complex compounds were determined from their solid conductivity measurements. Conductivity measurements of doped and undoped Schiff base oligomer and its metal complexes were carried out by electrometer at room temperature and atmospheric pressure and were calculated from four-point probe technique. When iodine was used as doping agent, conductivity of this oligomer and its metal complexes were observed to be increased. (c) 2006 Elsevier B.V. All rights reserved.Öğe Synthesis, characterization, optimization reaction conditions, and molecular weight distribution of poly(4-(4-nitrobenzylideneamino)phenol)(Polymer Research Center Iran, 2006) Kaya, İsmet; Çulhaoğlu, SüleymanIn this study, the conditions of oxidative polycondensation reaction of 4-(4-nitrobenzylideneamino)phenol (4-NBAP) were studied using oxidants such as air (O-2), H2O2, and NaOCl in an aqueous alkaline medium of 50-90 degrees C. Poly(4-(4-nitrobenzylideneamino) phenol) (P-4-NBAP) was characterized by H-1 and C-13 NMR, FTIR, UV-vis, size exclusion chromatography (SEC), and elemental analysis techniques. The solubility of oligomer was investigated by using organic solvents such as dimethylformamide, tetrahydrofurane, dimethylsulfoxide, methanol, ethanol, CHCl3, CCl4, toluene, acetonitrile, ethyl acetate. According to air (02) oxidant (flow rate 8.5 L/h), the conversion of (4-NBAP) was 50.83% in optimum conditions such as [4-NBAP](o) = [KOH](o) = 0.05 mol/L at 60 degrees C for 10 h. According to the SEC analysis, the number-average molecular weight (M-n), weight-average molecular weight (M-w) and polydispersity index (PDI) values of P-4-NBAP were found to be 11109, 12886 g mol(-1) and 1.160 using air (O-2); 17517, 23402 g mol(-1) and 1.336 using NaOCl; and 8960, 10653 g mol(-1) and 1.189 using H2O2, respectively. Also, thermogravimetric analysis showed poly(4-(4-nitrobenzylideneamino) phenol) is stable against thermal decomposition. The weight loss of P-4-NBAP was found to be 49.23% at 1000 degrees C.Öğe Synthesis, characterization, thermal degradation and electrical conductivity of oligo[2-(2-hydroxyphenyliminomethylbenzylidene)aminophenol] and oligomer-metal complexes(World Scientific Publ Co Pte Ltd, 2008) Kaya, İsmet; Çulhaoğlu, SüleymanThe oxidative polycondensation reaction conditions of 2-[( 2- hydroxyphenyliminomethylbenzylidene) aminophenol] ( 2- HPIMBAP) has been accomplished by using air O-2 and NaOCl oxidants in an aqueous alkaline medium between 50-90 degrees C. The optimum reaction conditions of the oxidative polycondensation and the main parameters of the process were established. At the optimum reaction conditions, yield of the products were found to be 67.72% and 61.49% for air O-2 and NaOCl oxidants respectively. The structures of the monomer and oligomer were confirmed by FT-IR, UV-Vis, H-1-NMR and C-13-NMR and elemental analysis. Also, TGA-DTA, SEC techniques and solubility tests were applied for characterization. H-1-NMR and C-13-NMR data show that the polymerization proceeded by the C-C and C-O-C coupling systems of ortho and para positions and oxyphenylene according to OH group of 2- HPIMBAP. The number-average molecular weight ( M-n), weight-average molecular weight ( M-w) and polydispersity index ( PDI) values of oligo[ 2-( 2- hydroxyphenyliminomethylbenzylidene) aminophenol] ( oligo( 2- HPIMBAP)) were determined. Thermal analyses of oligomer-metal complexes were investigated in N-2 atmosphere between 15-1000 degrees C. Electrical conductivities of oligo( 2- HPIMBAP) and oligomer-metal complexes measured with four point technique. Electrical conductivity of the oligo( 2- HPIMBAP) was measured, showing that the oligomer is a typical semiconductor. Optical band gaps ( E-g) of 2- HPIMBAP, oligo( 2- HPIMBAP) and oligomer-metal complex compounds were determined by UV-Vis measurements. The monomer and oligomer were screened for antibacterial activities.Öğe Synthesis, structure analysis, investigation of conductivity, thermal properties of polyphenol derivatives containing a rhodanine moiety and their Cu(II), VO(IV) complexes(Elsevier Science Sa, 2020) Kaya, İsmet; Ercağ, Ayşe; Çulhaoğlu, SüleymanIn this study, 5-benzylidenerhodanine derivatives namely 5-(2-hydroxybenzylidene)-2-thioxothiazolidin-4-one (SAR) and 5((2-hydroxynaphthalen-1-yl)methylene)-2-thioxothiazolidin-4-one (HNAR) used as monomer. The new polymers of SAR and HNAR (PSAR and PHNAR respectively) were synthesized by oxidative polycondensation reaction. The polymers were characterized by elemental, FT-IR, UV-Vis, H-1 NMR,C- 13 NMR, TG-DTA analyses techniques. The molecular weight distribution values of the PSAR and PHNAR were determined by size exclusion chromatography (SEC) analysis. According to the SEC analyses, the number average molecular weight (M-n), weight average molecular weight (M-w) and polydispersity index (PDI) values of PSAR and PHNAR were found to be 5300, 7250 g mol(-1) and 1.368; 5750, 7350 g mol(-1) and 1.278, respectively. The Cu (II), VO (IV) complexes of PSAR and PHNAR (PSAR-Cu and PSAR-VO) were successfully prepared using Cu (AcO)(2)xH(2)O and VOSO(4)x5H(2)O hydrate salts. The polymer-metal-complexes were characterized by FT-IR, elemental and TG-DTA analysis techniques. The weight losses of PHNAR, PHNAR-Cu, PHNAR-VO, PSAR, PSAR-Cu and PSAR-VO were found to be 69.50, 58.50, 62.25, 89.05, 74.55 and 61.75% at 1000 degrees C, respectively. TG analyses were showed to be stable of synthesized polymers against thermal decomposition. Electrical properties of doped polymers, undoped polymers and their complexes were determined. Also, the optical band gaps (Eg) of these complexes were calculated from their absorption edges.
