Synthesis and structural characterization of two cis-dioxorhenium(V) ReO2[SN][P] mixed-ligand complexes

Two novel five-coordinate cis-dioxorhenium(V) complexes of the general form ula ReO2[R2NCH2CH2S][PPh3] (R2N = Et2N, complex 1 and R2N = (o-CH3O-C6H4N(C H2CH2)(2)N, complex 2) have been synthesized by reacting RCOCl3(PPh3)(2) wi th the respective bidentate ligands R2NCH2CH2SH. The complexes have been ch aracterized by elemental analysis, IR, NMR spectroscopies and X-ray crystal lography. X-ray crystallographic studies showed that the coordination geome try around rhenium is distorted trigonal bipyramidal. The basal plane is de fined by the two doubly bonded oxygen atoms and the sulfur of the bidentate ligand, while the nitrogen of the ligand and the phosphorus occupy the api cal positions. (C) 2001 Elsevier Science B.V. All rights reserved.