Syntheses and molecular structures of novel Ru(II) complexes with bidentate benzimidazole based ligands and their catalytic efficiency for oxidation of benzyl alcohol
JOURNAL OF MOLECULAR STRUCTURE, cilt.1123, ss.35-43, 2016 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 1123
- Basım Tarihi: 2016
- Doi Numarası: 10.1016/j.molstruc.2016.06.017
- Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.35-43
- Anahtar Kelimeler: Ru (II) complexes, Piano-stool complexes, Oxidation of benzyl alcohol, Bidentate chelates, 2-(2-quinoliny1)-1H-benzimidazole, PALLADIUM(II) COMPLEXES, BENZIMIDAZOLE-5,6-DICARBOXYLIC ACID, RUTHENIUM(II) COMPLEXES, WATER OXIDATION, DONOR LIGANDS, REACTIVITY, BEHAVIOR, BEARING, EPOXIDATION, CD(II)
- Ondokuz Mayıs Üniversitesi Adresli: Evet
Özet
Five bidentate ligands derived from quinoline-2-carboxylic acid, i.e. 2-(1H-benzimidazol-2-yl)quinoline (L1), 2-(1-benzyl-1H-benzimidazol-2-yl)quinoline (L2), 2-[1-(2,3,5,6-tetramethylbenzyl)-1H-benzimidazol-2-yliquinoline (L3), 2-[1-(4-chlorobenzyl)-1H-benzimidazol-2-yl]quinoline (L4), and 2-[1-(4-methylbenzyl)-1H-benzimidazol-2-yl]quinoline (L5) were synthesized. Treatment of L1-5 with [RuCl2(p-cymene)](2) and KPF6 afforded six-coordinate piano-stool Ru(II) complexes, namely, [RuCI(L1)(p-cymene)]PF6 (C1), [RuCI(L2)(p-cymene)]PF6 (C2), [RuCI(L3)(p-cymene)]PF6 (C3), [RuCI(L4)(p-cymene)] PF6 (C4), and [RuCI(L5)(p-cymene)]PF6 (C5). Synthesized compounds were characterized with different techniques such as H-1 and C-13 NMR, FT-IR, and UV-vis spectroscopy. The solid state structure of L1 and C3 was confirmed by single-crystal X-ray diffraction analysis. The single crystal structure of C3 verified coordination of L3 to the Ru(II) center. The Ru(II) center has a pseudo-octahedral three legged piano stool geometry. The complexes C1-5 were tested as catalysts for the catalytic oxidation of benzyl alcohol to benzaldehyde in the presence of periodic acid (H5IO6) (Substrate/Catalyst/Oxidant = 1/0.01/0.5). The best result was obtained with C2 (3 h -> 90%). (C) 2016 Elsevier B.V. All rights reserved.