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New Rh(III) complexes of 5‐methyl‐5‐(pyridyl)‐2,4‐imidazolidenedione: Synthesis, X‐ray structure, electrochemical study and catalytic behaviour for hydrogenation of ketones
Author(s) -
Sabounchei Seyyed Javad,
Sayadi Mohsen,
Hashemi Mojdeh Sadat,
Hashemi Ali,
Nematollahi Davood,
Salahifar Eslam,
Gable Robert W.
Publication year - 2017
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3716
Subject(s) - chemistry , catalysis , recrystallization (geology) , ligand (biochemistry) , medicinal chemistry , electrochemistry , molecule , carbon 13 nmr , dimethyl sulfoxide , dissolution , x ray , nuclear magnetic resonance spectroscopy , proton nmr , stereochemistry , organic chemistry , physics , electrode , quantum mechanics , paleontology , biochemistry , receptor , biology
We describe the reaction of anion [RhCl 6 ] 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[RhCl 2 (L1) 2 ] ( 1 ), cis ‐ and trans ‐K[RhCl 4 (HL2) 2 ] ( 2a and 2b ) and cis ‐ and trans ‐K[RhCl 4 (HL3) 2 ] ( 3a and 3b ). Complexes 2a , 2b , 3a and 3b were characterized successfully using infrared, 1 H NMR and 13 C 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 ‐[RhCl 2 L1(DMSO) 2 ]DMSO. The catalytic activity of these complexes was then evaluated for the hydrogenation of various ketones.