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    Öğe
    Comparison of Ru(II)-arene complexes containing naphthyl-/ quinolinyl-substituted ligand vis-a-vis structure, spectra and catalytic activity
    (Elsevier, 2024) Turkmen, Gulsah; Cakir, Sinem; Kavukcu, Serdar Batikan; Sahin, Onur; Turkmen, Hayati
    A series of ligands with naphthyl/quinolinyl substituent in their principal molecular framework were synthesised. Their corresponding half -sandwich ruthenium (Ru) complexes ( Ru 1a-b , Ru 2a-b and Ru 3 ) were then successfully generated. The structure of all synthesised compounds was comprehensively elucidated via 1 H and 13 C nuclear magnetic resonance (NMR), elemental analysis and Fourier -transform infrared spectroscopies. Notably, the structural configuration of Ru 3 was delineated via X-ray diffraction. The catalytic efficacy of the Ru complexes was systematically probed in two distinct reactions: 1) transfer hydrogenation (TH) of ketones using 2-propanol as the hydrogen source and 2) reduction of nitroarenes to anilines using sodium tetrahydridoborate as the reducing agent in ethanol, conducted at ambient temperature. Comparative analysis of catalytic yields of the Ru complexes ( Ru 1a-b , Ru 2a-b and Ru 3 ) in both reaction types revealed that Ru 3 delivered superior catalytic performance in both types of reactions. Furthermore, scrutiny of the 1 H NMR spectrum during the TH reaction revealed formation of Ru-hydride species.
  • [ X ]
    Öğe
    Di- and tri-nuclear-palladium complexes bearing piperidoimidazolin-2-ylidenes: synthesis, characterization, and catalytic applications
    (Pergamon-Elsevier Science Ltd, 2015) Turkmen, Gulsah; Atik, Aylin; Sahin, Zarife Sibel; Turkmen, Hayati
    A series of di- and tri-nuclear Pd(II) complexes with piperidoimidazolin-2-ylidenes anchored to benzene ring via methylene spacers were synthesized. The obtained complexes were fully characterized by IR, H-1 NMR, C-13 NMR spectroscopy and elemental analysis. Molecular structures of two of the products have been determined by means of X-ray crystallography. Their catalytic performances in Suzuki-Miyaura and Mizoroki-Heck cross-coupling reactions were thoroughly investigated. The catalytic reactivity of new di- and tri-metallic complexes was compared with the monometallic systems. It is observed that the activities of the tri-nuclear Pd(NHC) complexes were higher than the corresponding mono- and di-nuclear complexes under the same conditions. (C) 2015 Elsevier Ltd. All rights reserved.