Thiocyanatomolybdenum(V) Complexes

Abstract

Formation of thiocyanatomolybdenum(V) complex ions [MoO(NCS)2]+, H3[MoOCl3(NCS)2]+, H4[MoOCl4(NCS)]2+, H4[MoOCl5]2+, H4[MoOCl3(NCS)]3+, and H2[MoOCl2]3+ (within the range of 0.7-5 mol/l HCl) and H4[MoOBr3(NCS)2]2+ and H4[MoOBr5]2+ (for 5 mol/l HBr) in aqueous solution was shown by means of spectrophotometry and mathematical simulation. As compared to bromide ions, Cl- ions demonstrate a higher competitive ability when thiocyanato ions occur in the coordination sphere of molybdenum(V). The absence of polymeric complex species confirms the depolymerizing properties of the ligand under investigation.