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Synthesis and Structure of Ru(II) Complexes of Thiosemicarbazone: Highly Selective Catalysts for Oxidative Scission of Olefins to Aldehydes
Author(s) -
Muthumari Subramanian,
Ramesh Rengan
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800163
Subject(s) - monobasic acid , chemistry , catalysis , denticity , acetonitrile , octahedral molecular geometry , semicarbazone , ligand (biochemistry) , medicinal chemistry , yield (engineering) , bond cleavage , crystal structure , crystallography , inorganic chemistry , polymer chemistry , organic chemistry , materials science , biochemistry , receptor , metallurgy
New Ru(II)‐TSC complexes of the type [RuH(TSC)(CO)(PPh 3 ) 2 ] (where TSC= monobasic bidentate anthracenealdehyde thiosemicarbazone ligands) were synthesized and characterized by means of elemental analysis, IR, UV−vis, and NMR spectral methods. Molecular structures of the complexes were determined by single crystal X‐ray crystallography, which prove the coordination mode of the ligands and reveal the presence of a distorted octahedral geometry around the Ru ion. The synthesized complexes were developed as catalysts for selective oxidative cleavage of a wide range of alkenes as well as alkynes to the corresponding aldehydes/ diketones in acetonitrile/ water in the presence of NaIO 4 at room temperature. The maximum yield was obtained up to 99% using 0.5 mol% of catalyst loading without any over oxidation byproducts. The effect of substituents of the ligand, solvents, reaction temperature and catalyst loading on the catalytic activity of the complexes is also investigated.