New Rh(III) complexes of 5-methyl-5-( pyridyl)-2,4imidazolidenedione: Synthesis, X-ray structure, electrochemical study and catalytic behaviour for hydrogenation of ketones

作者：Sabounchei Seyyed Javad^*; Sayadi Mohsen; Hashemi Mojdeh Sadat; Hashemi Ali; Nematollahi Davood; Salahifar Eslam; Gable Robert W

来源：Applied Organometallic Chemistry, 2017, 31(10): e3716.

DOI：10.1002/aoc.3716

• electrochemical study
• hydrogenation
• Rh(III) complexes
• spectroscopy
• synthesis
• X-ray structure

We describe the reaction of anion [RhCl6](3-) with a series of hydantoin ligands (HL1, HL2 and HL3 = 5-methyl-5-(2-, 3-and 4-pyridyl)-2,4-imidazolidenedione, respectively). Based on spectroscopic, cyclic voltammetric, elemental and MS analyses, the complexes have the general formula K[RhCl2(L1)(2)] (1), cis-and trans-K[RhCl4(HL2) 2] (2a and 2b) and cis-and trans-K[RhCl4(HL3)(2)] (3a and 3b). Complexes 2a, 2b, 3a and 3b were characterized successfully using infrared, H-1 NMR and C-13 NMR spectral analyses. Dissolution of complex 1 in dimethylsulfoxide (DMSO) led to elimination of one KL1 ligand and coordination of two DMSO molecules as ligands and transformation of this complex to cis-and trans-[RhCl(2)L1(DMSO)(2)] (1a and 1b). Recrystallization led to separation and isolation of crystals of 1a from the initial mixture. X-ray analysis results showed that this complex was crystallized as solvated complex cis-[RhCl2L1(DMSO)(2)] DMSO. The catalytic activity of these complexes was then evaluated for the hydrogenation of various ketones.

• 出版日期2017-10