MIXED-LIGAND OXORHENIUM(V) COMPLEXES WITH RHENIUM-SELENIUM BONDS - MOLECULAR-STRUCTURE OF E-1,5-DITHIOLATO)-(BENZENESELENOLATO)OXORHENIUM(V)

Mixed ligand oxorhenium(V) complexes [ReO(SXS)(SeR)] containing terden tate dithiol ligands HS-CH2CH2-X-CH2CH2-SH (HSXSH, X = O,S) and benzen eselenol or benzylselenol, RSeH (R = C6H5, CH2-C6H5) as monodentate li gands have been synthesized and characterized by spectroscopic and X-r ay crystallographic methods. X-ray structure analysis of complex 3 (X = O, R = C6H5) shows that the rhenium coordination number is five and the coordination polyhedron is a square pyramid. Structure and spectro scopic data of the complexes are close to those of the corresponding s ulphur (RSH as monodentate ligand) compounds.