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بیست و نهمین کنفرانس شیمی آلی ایران
New Rh(III) complex of 5-methyl-5-(2-pyridyl)2,4-imidazolidenedione; Synthesis, X-ray structure and high catalytic activity toward hydrogenation of ketones
نویسندگان :
محسن صیادی ( دانشگاه بوعلی سینا همدان )
کلید واژه ها :
Rh(III) complex،X-ray structure،Hydrogenation،synthesis
چکیده مقاله :
In recent years, the importance of metal complexes of hydantoins has been studied due to applications such as catalytic and biological activity of this class of compounds and new structural features presented by the metal complexes of such ligands. In late nineteenth century, chemistry of a variety of Rh(III) complexes with several N-heterocycles and their derivatives have been widely investigated and it was attracted more attention in recent years [1, 2]. As seen from literature[3], Rh(III) complexes with N-heterocycles ligands can applied as efficient catalysts in the organic reactions (transfer hydrogenation reaction of ketones) [4]. In this work we describe the reaction of anion [RhCl6]3- with hydantoin ligand (HL= 5-methyl-5-(2-pyridyl)-2,4-imidazolidenedione). Based on the spectroscopies (1H and 13C NMR), elemental and MS analyses, the complex has the general formula K[RhCl2(L)2]. Next, dissolution of this complex in DMSO leads to elimination of one KL ligand and coordination of two DMSO molecules as ligand and transformation of this complex to [RhCl2L(DMSO)2] (1) complex. The X-ray analysis results showed that this complex was crystallized as solvated complex cis-[RhCl2L(DMSO)2]. The catalytic activity of this complex was then evaluated for the hydrogenation of various ketones. (Scheme)
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