1422158-04-0Relevant academic research and scientific papers
Synthesis, electronic structure and catalytic activity of ruthenium-iodo-carbonyl complexes with thioether containing NNS donor ligand
Jana, Subrata,Jana, Mahendra Sekhar,Biswas, Sujan,Sinha, Chittaranjan,Mondal, Tapan Kumar
, p. 52 - 60 (2014)
The ruthenium carbonyl complexes 1 and 2 with redox noninnocent NNS donor ligand, 1-methyl-2-{(o-thiomethyl)phenylazo}imidazole (L) have been synthesized and characterized by various analytical and spectroscopic (IR, UV-Vis and 1H NMR) techniques. The complexes exhibit a quasi-reversible one electron Ru(II)/Ru(III) oxidation couple at 1.11 V for 1 and 0.76 V for 2 along with two successive one electron ligand reductions. Catalytic activity of the compounds has been investigated to the oxidation of PhCH2OH to PhCHO, 2-butanol (C4H9OH) to 2-butanone, 1-phenylethanol (PhC2H4OH) to acetophenone, cyclopentanol (C 5H9OH) to cyclopentanone, cyclohexanol to cyclohexanone, cycloheptanol to cycloheptanone and cycloctanol to cycloctanone using N-methylmorpholine-N-oxide (NMO) as oxidant. The catalytic efficiency of 2 is greater than complex 1 and well correlate with the metal oxidation potential. DFT, NBO and TDDFT calculations in DFT/B3LYP/6-31G(d)/lanL2TZ(f) method are employed to interpret the structural and electronic features of the complexes.
Use of a Ru/Os-CO-diiodide precursor to synthesize heteroleptic 1-alkyl-2-(arylazo)imidazole complexes: The structural characterization, electrochemistry and catalytic activity
Sarkar, Shyamal Kumar,Jana, Mahendra Sekhar,Mondal, Tapan Kumar,Sinha, Chittaranjan
, p. 246 - 254 (2013/04/23)
Trans-(I,I)-[MI2(CO)2(RaaiR′)] (M = Ru, Os) (RaaiR′ = 1-alkyl-2-(arylazo)imidazoles) complexes have been synthesized by the reaction of RaaiR′ and [Ru(CO)4I2] or [Os(CO)4I2] in acetonitrile solution and the complexes have been characterized by elemental analysis and spectral (FT-IR, UV-Vis, 1H NMR) data. The structural confirmation has been determined by single crystal X-ray diffraction of trans-(I,I)-[MI2(CO) 2(HaaiEt)] (M = Ru, 3b; Os, 5b) (HaaiEt = 1-ethyl-2-(phenylazo) imidazole) and has shown a distorted octahedral geometry with a trans-I,I and cis-CO, CO configuration. The complexes show a M(III)/M(II) couple and the reduction of the chelated azoimine ligand. These complexes act as catalysts in the oxidation of PhCH2OH to PhCHO, 2-butanol (C4H 9OH) to 2-butanone, cyclopentanol (C5H9OH) to cyclopentanone and cyclohexanol to cyclohexanone by N-methylmorpholine-N-oxide (NMO). The molecular orbital diagram has been drawn by density functional theory (DFT) using the optimized geometry from the single crystal X-ray parameters. The assignments of electronic spectra have been carried out by TD-DFT calculations both in the gas and acetonitrile phases.
