MIXED THIOCYANATO-THIONE RHENIUM(V) COMPLEXES

New rhenium(V) complexes were prepared by reaction of a 1:1 mixture of KSCN and 2-benzimidazolethione, (L), or 2-benzoxazolethione, (L'), wi th H-2[ReOCl5]. Although the possible sites of coordination for the tw o ligands are different, identical mixed thiocyanato-thione complexes were obtained. In 6 N HCl, the complexes have the formula [ReOL(or L') (SCN)(2)Cl(OH2)]. H2O, but in 9 N HCl the complexes have the formula [ ReOL(or L')(SCN)Cl-2(OH2)]. The electronic absorption spectra and the magnetic moments prove octahedral configuration, IR and conductivity m easurements combined with thermal analyses show that the organic ligan ds behave as neutral monodentate ligands and the thiocyanate anion as a monodentate monoanionic ligand in respect to the metal atom.