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Öğe 5-Nitrobenzimidazole containing Pd(II) catalyzed C-C cross-coupling reactions: The effect of the N-substituent of the benzimidazole structure on catalyst activity(Elsevier Science Bv, 2019) Buldurun, Kenan; Ozdemir, IsmailA series of Pd(II) complexes (1a-e) were successfully synthesized by reaction of N-substituted 5-nitrobenzimidazole with [PdCl2(CNCH3)(2)] in toluene under argon reflux condition. Their catalytic activity in the Suzuki-Miyaura and Mizoroki-Heck coupling reactions were investigated. All these complexes were characterized by elemental analysis, H-1 NMR, C-13 NMR and IR spectroscopy. The catalytic activities of N-substituted 5-nitrobenzimidazole palladium (II) complexes were screened in Mizoroki-Heck and Suzuki-Miyaura coupling reactions. The reactions were optimized for the most suitable temperature, solvent and base system. The Pd(II) complexes exhibited good catalytic activity at the Mizoroki-Heck reaction. Additionally, the Suzuki-Miyaura showed relatively excellent activity at the coupling reaction. (C) 2019 Elsevier B.V. All rights reserved.Öğe Benzimidazol çekirdeği içeren azol komplekslerinin sentezi ve katalitik özellikleri(İnönü Üniversitesi, 2015) Buldurun, KenanHomojen katalizörlerin sentetik uygulamaları son 30 yıl boyunca yoğun bir şekilde çalışılmaktadır. Bu alandaki son araştırmalar, geniş bir yelpazede kararlı, etkili ve yenilenebilir katalizörlerin sentezi için yeni metotlar üzerine olmaktadır. Bu hem ekonomi hem de çevre için büyük yarar ifade etmektedir. Nispeten ligant serisindeki çok küçük bir değişiklikle hem sterik hem de elektronik etkileri mükemmel şekilde kontrol edilebilen az sayıda homojen geçiş metal katalizörü vardır. Azol bileşikleri değişik alanlarda yaygın bir şekilde kullanıldığından dolayı aromatik azo bileşiklerin sentezine yoğun bir ilgi olmuştur. İmidazol, imidazolin, benzimidazol bilinen en yaygın azol bileşikleridir. İmidazol, benzimidazol, benzoksazol ve benzotiyazol içeren ilgili bileşikler biyometrik ve kataliz yönündeki özelliklerinden dolayı koordinasyon kimyasında yoğun bir şekilde çalışılmaktadır. Ayrıca, azoller iyi elektron verici olarak görev alan ve zayıf etkileşim sağlayan koordine malzemeler alanında da kullanılmaktadır. Donör azot atomu içeren organometalik kompleksler, organik sentezde, homojen katalizde ve koordinasyon kimyası alanlarında genellikle yüksek aktivite sergilediklerinden dolayı gittikçe dikkatleri üzerine toplayan popüler bir alan olmuştur. Bulunan sonuçlar 4 başlıkta özetlenebilir; 1. N-sübstitüyebenzimidazol (1a-1o) ligantları sentezlendi, yapıları uygun spektroskopik yöntemlerle aydınlatıldı. 2. Benzimidazol ligantları [RuCl2(p-simen)]2 kompleksi ile etkileştirilerek 5-nitrobenzimidazol-Ru kompleksleri (2a-o) sentezlendi ve yapıları uygun spektroskopik yöntemler ile aydınlatıldı. 3. Benzimidazol ligantları [PdCl2(CH3CN)2]2 kompleksi ile etkileştirilerek 5-nitrobenzimidazol-Pd kompleksleri (3a-o) sentezlendi ve yapıları uygun spektroskopik yöntemler ile aydınlatıldı. 4. Sentezlenen Ru(II)-benzimidazol komplekslerinin (2a-o) transfer hidrojenasyon tepkimelerindeki katalitik aktiviteleri incelendi. Sentezlenen Pd(II)-azol komplekslerinin (3a-o) Mizoroki-Heck, Suzuki-Miyauraeşleşme tepkimelerindeki katalitik aktiviteleri incelendi.Öğe N-koordineli 5-Nitrobenzimidazol İçeren Rutenyum(II) Yarı Sandviç Kompleksleri: Sentezi, Yapıları ve Ketonların Katalitik Transfer Hidrojenasyonu(2019) Buldurun, Kenan; Özdemir, İsmailÖz: Bu çalışmada N-koordineli 5-nitrobenzimidazol ligandlarının [RuCl2(p-simen)]2 metal tuzu ile reaksiyonlarındayeni altı kompleks bileşik hazırlandı ve yapıları, elemental analiz, IR ve 1H13C NMR spektroskopik tekniklerleaydınlatıldı. Sentezlenen Ru(II) kompleksleri, transfer hidrojenasyonu için katalizör olarak test edildi.Kompleksler, 80 °C?de KOH varlığında, çeşitli sübstitüe ketonların hidrojen transfer tepkimelerindeki katalitikaktiviteleri incelendi ve %100?e kadar bir dönüşüm gösterdi. Komplekslerin aktif katalizörler olduğu bulundu.Öğe Preparation and spectroscopic studies of Fe(II), Ru(II), Pd(II) and Zn(II) complexes of Schiff base containing terephthalaldehyde and their transfer hydrogenation and Suzuki-Miyaura coupling reaction(Sciendo, 2019) Turan, Nevin; Buldurun, Kenan; Colak, Naki; Ozdemir, IsmailThis study describes synthesis, spectroscopic characterization and catalytic activities of Fe(II), Ru(II), Pd(II) and Zn(II) complexes with a novel Schiff base ligand (L) derived from methyl 2-amino-5,5,7,7-tetramethyl-4,5,6,7-tetrahydrobenzo[b] thiophene-3-carboxylate and terephthalaldehyde. We used spectroscopic techniques including IR, UV-Vis, H-1-NMR, C-13-NMR, elemental analysis and also mass analysis and magnetic susceptibility measurements to identify the products. The Pd(II) complex was used as a potential catalyst for Suzuki-Miyaura coupling reaction of some aryl halides under optimized conditions. The effect of various bases such as NaOH, KOH, and KOBut was investigated in transfer hydrogenation (TH) of ketones by isopropyl alcohol as the hydrogen source. Ru(II) and Pd(II) complexes showed catalytic activity while Zn(II) and Fe(II) metal complexes failed to do that.Öğe Schiff Base and Its Fe(II), Zn(II), Ru(II), Pd(II) Complexes Containing ONS Donor Atoms: Synthesis, characterization and Catalytic Studies(2019) Buldurun, Kenan; Özek, Nevin Turan; Çolak, Naki; Özdemir, İsmailThe work include the synthesis, spectroscopic characterization and as well as catalytic activities of Fe(II), Zn(II), Ru(II), and Pd(II) complexes with a novel Schiff base ligand derived from methyl 2amino-5,5,7,7-tetramethyl-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate and salicylaldehyde. Spectroscopic techniques including IR, UV–Vis, NMR, and mass analysis as well as elemental analysis and magnetic susceptibility measurement were used to identify the compounds. Based on elemental and spectral studies octahedral geometry was proposed to Fe(II), Zn(II) and Ru(II) complexes and square planar geometry was proposed to Pd(II) complex. To improve more efficient and stable catalysts, we wanted to study if there is any influence the catalytic activity of ruthenium complex for the transfer hydrogenation of ketones and we wanted to examine the catalytic activities of palladium complex in Suzuki C-C cross coupling reactions under various conditions.Öğe Synthesis, characterization and catalytic activities of some Schiff base ligands and Pd(II) complexes containing substituted groups(Elsevier, 2024) Buldurun, Kenan; Turan, Nevin; Altun, Ayhan; Colak, Naki; Ozdemir, IsmailIn this manuscript, new Schiff bases (L1, L2) and their L1-Pd(II), L2-Pd(II) complexes were synthesized. The structures of the synthesized Schiff bases and Pd(II) complexes were determined with the aid of FT-IR, 1H and 13C NMR, elemental analysis, TGA, magnetic susceptibility, mass analysis, powder X-ray diffraction analysis and UV-vis methods. The catalytic activities of L1-Pd(II) and L2-Pd(II) were examined in Suzuki-Miyaura and Mizoroki-Heck C-C coupling reactions. This study clearly shows that palladium complexes based Schiff base ligands are versatile and effective catalysts for reactions important in the synthesis of sensitive and fine chemicals. They are suitable for catalyzing a wide range of reactions under mild experimental conditions.Öğe Synthesis, structural characterization and biological activities of metal(II) complexes with Schiff bases derived from 5-bromosalicylaldehyde: Ru(II) complexes transfer hydrogenation(Elsevier Science Bv, 2019) Buldurun, Kenan; Turan, Nevin; Savci, Ahmet; Colak, NakiIn this study, two novel Schiff base ligands (L-1 and L-2) derived from condensation of methyl 2-amino-6-methyl-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3-carboxylate and methyl 2-amino-6-phenyl-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate, both starting matter with 5-bromo-salicylaldehyde, and their Zn(II) and Ni(II) metal complexes have been prepared using a molar ratio of ligand:metal as 1:1 except the Ru(II) complexes 1:0.5. The structures of the obtained ligands and their metal complexes were characterized by elemental analysis, FT-IR, H-1 NMR, C-13 NMR, UV-vis, thermal analysis methods, mass spectrometry, and magnetic susceptibility measurements. Antioxidant and antiradical activity of Schiff base ligands and their metal complexes were been evaluated in vitro tests. Antioxidant activities of metal complexes generally were more effectives than free Schiff bases. 1c and 2c were used as catalysts for the transfer hydrogenation (TH) of ketones. 1c, 2c complexes were found to be efficient catalyst for transfer hydrogenation reactions. (C) 2018 King Saud University. Production and hosting by Elsevier B.V.
