- Synthesis of bimetallic complexes bridged by 2,6-bis(benzimidazol-2-yl) pyridine derivatives and their catalytic properties in transfer hydrogenation
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A series of binuclear rhodium(i) and iridium(i) complexes with 2,6-bis(benzimidazol-2-yl) pyridine (bzimpy) derivatives were synthesized and characterized by elemental analysis and spectroscopic methods. The molecular and crystal structures of complex 3d were determined by the single crystal X-ray diffraction technique. Their monometallic analogues were prepared to compare the catalytic properties of the bimetallic complexes. To determine the catalyst properties that result in a cooperative, bimetallic enhancement of the reaction rate, the systematic variation of the intermetallic distance and the ligand donor properties of the bimetallic complexes were explored based on the transfer hydrogenation reactions of ketones.
- Günnaz, Salih,G?k?e, Ayta? Gürhan,Türkmen, Hayati
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p. 17317 - 17328
(2019/01/03)
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- Half-sandwich η6-arene-ruthenium(II) complexes bearing 1-alkyl(benzyl)-imidazo[4,5-f][1,10]-phenanthroline (IP) derivatives: The effect of alkyl chain length of ligands to catalytic activity
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The reaction of bromoalkanes (R-Br; (3), R=CnH2n+1, n=4 (a), 8 (b), 12 (c),18 (d)) and bromobenzyl derivatives (R′-Br; (4), R′=CH2C6H2(CH3) 3-2,4,6 (a); CH2C6H(CH3) 4-2,3,5,6 (b); CH2C6(CH3) 5 (c)) with 1H-imidazo[4,5-f][1,10]-phenanthroline (IP)(L 2) gave the corresponding 1-R-imidazo[4,5-f][1,10]-phenanthroline (IPR)(L3a-d) and 1-R′-imidazo[4,5-f][1,10]-phenanthroline(IPR') (L4a-c) ligands, respectively. Treatment of L3a-d and L4a-d with [Ru(p-cymene)Cl2]2 led to the formation of [Ru(p-cymene)(IPR)Cl]Cl (RuL3a-d) and [Ru(p-cymene)(IPR′)Cl]Cl (RuL4a-c). New ruthenium(II) complexes RuL3a-d and RuL4a-c were characterized by elemental analysis, FTIR, UV-visible and NMR spectroscopy. In order to understand effects of these changes on the N-substituent of imidazol on IP and how they translate to catalytic activity, these new RuL2, RuL3a-d and RuL4a-c were applied in the transfer hydrogenation of ketones by 2-propanol in presence of potassium hydroxide. The activities of the catalysts were monitored by NMR and GC analysis.
- G?k, Lütfiye,Türkmen, Hayati
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p. 10669 - 10674
(2013/11/19)
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