Mixed Ligand Isothiocyanato Complexes of Mo₂O⁺⁴₃and Mo₂O⁺²₄

Abstract

Abstract Binuclear mixed ligand isothiocyanato complexes of Mo(V) of the types Mo2O3L2(NCS)4 (where L = 2,2′-bipyridyl, 1,10-phenanthroline or 2,9-dimethyl-1,10-phenanthroline) and Mo2O4L′2(NCS)2 (where L′ = the above diimines; N-oxides of pyridine, 2-picoline, quinoline or 1,10-phenanthroline and 2,2′-bipyridyl-N,N′-dioxide) have been prepared. The complexes containing the Mo2O+4 3 moiety have been obtained by reacting MoO(OH)3 (dissolved in HSCN) or (pyH) (dissolved in ethanol) with the respective diimines. The complexes containing the Mo2O+2 4 unit have been obtained from the above starting materials and also from (Me4N) in dilute HSCN or an aqueous or ethanolic solution. The complexes of the type Mo2O3L2 (NCS)4 are converted to the corresponding complexes of the type Mo2O4L2(NCS)2 on digestion with water. All the complexes are very weakly paramagnetic. The i.r. and the electronic spectra show the characteristic features of complexes containing the Mo2O+4 3 and Mo2O+2 4 moiety. The i.r. spectra also show that the compounds are isothiocyanato complexes (N-bonded NCS) and in the case of the N-oxide complexes the molybdenum atom is bonded to the O-atom.