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Öğe An efficient ligand-free method for the transfer hydrogenation of ketones and aldehydes catalyzed by different complexes(Tubitak Scientific & Technological Research Council Turkey, 2013) Yasar, Sedat; Cekirdek, Suzan; Akkus Tas, Nilay; Yildirim, Semiha; Ozdemir, IsmailA very efficient ligand-free method was developed for the transfer hydrogenation of ketones and aldehydes catalyzed by different metal complexes. With this catalytic system, the catalytic performance and catalytic stability of different Ir, Ru, and Pd complexes were more favorable than those of the previously reported systems for transfer hydrogenation. This ligand-free catalytic system showed good stability and excellent activity even with lower catalyst concentrations for the ketones and aldehydes tested.Öğe Electrical and photoelectrical characterization of organic-inorganic heterostructures based on Ru-N-heterocyclic carbene complexes(Elsevier Gmbh, 2018) Yasar, Sedat; Cekirdek, Suzan; Binbay, Nil Ertekin; Tombak, Ahmet; Ocak, Yusuf Selim; Arslan, Nevin; Baysal, Akin1,3-Bis(2-morpholinethyl)benzimidazoliumtrichlorido(eta(6)-p-cymene)-ruthenate(11), 2, was synthesized and characterized by NMR spectroscopy and micro analysis. The organic -inorganic heterojunctions were fabricated by using n-type Si wafer and a series of Ru-N-heterocyclic carbene complexes, 3-5, bearing sterically hindered aryl groups were documented for the first time. The thin films of the complexes are deposited on n-Si substrates using spin coating. Current-voltage (I-V) measurements of the devices in dark and illuminated environments were analyzed to determine electrical parameters of devices. Furthermore, the photoelectrical properties of the structures were investigated examined using I-V measurements under a solar simulator. Complexes 3 and 5 showed very low series resistance resulting in high rectification ratios which are promising results for the future electronic and photoelectronic applications. (C) 2017 Published by Elsevier GmbH.Öğe New Bisbenzimidazolin-2-Ylidene Salts as N-Heterocyclic Dicarbene Precursors: Synthesis, Characterization, and Involvement in Palladium-Catalyzed Suzuki Reactions(Wiley-Hindawi, 2014) Yasar, Sedat; Cekirdek, Suzan; Ozdemir, IsmailThe present work focuses on the study of catalytic activity of polystyrene-supported p-toluenesulfonic acid (PS/PTSA) and the synthesis of alpha-aminophosphonates from the Kabachnik-Fields (KF) reaction under microwave irradiation in solvent-free conditions. Recently, the catalytic activity of PS/PTSA was tested with good yields. This procedure is the simplest, most straightforward, environment friendly method for the synthesis of alpha-aminophosphonates from simple to different substituted aldehyde substrates. Furthermore, this catalyst can be recovered and reused without loss of its catalytic activity.Öğe Palladium(II)-N-heterocyclic carbene complexes: synthesis, characterization and catalytic application(Wiley, 2014) Cekirdek, Suzan; Yasar, Sedat; Ozdemir, IsmailN-Heterocyclic carbenes (NHCs) are of great importance and are powerful ligands for transition metals. A new series of sterically hindered benzimidazole-based NHC ligands (LHX) (2a, 2b, 2c, 2d, 2e, 2f), silver-NHC complexes (3a, 3b, 3c, 3d, 3e, 3f) and palladium-NHC complexes (4a, 4b, 4c, 4d, 4e, 4f) have been synthesized and characterized using appropriate spectroscopic techniques. Studies have focused on the development of a more efficient catalytic system for the Suzuki coupling reaction of aryl chlorides. Catalytic performance of Pd-NHC complexes and in situ prepared Pd(OAc)(2)/LHX catalysts has been investigated for the Suzuki cross-coupling reaction under mild reaction conditions in aqueous N,N-dimethylformamide (DMF). These complexes smoothly catalyzed the Suzuki-Miyaura reactions of electron-rich and electron-poor aryl chlorides. Copyright (c) 2014 John Wiley & Sons, Ltd.
