Molybdenum and Tungsten Nitrosyl Complexes with Dithiocarbamate Ligands

Abstract

Molybdenum and tungsten nitrosyl complexes with dithiocarbamato ligands have been prepared and characterized by analysis, and ¹H n.m.r, and infrared studies. The molybdenum complexes are formulated as seven-coordinate species [Mo(NCO)L(S₂CNEt₂)₂NO]^- (L = Cl^-, N₃^-, NCS^-),{Mo(NCO)(S₂CNEt₂)₂NO}₂N₂H₄ and [Mo(NCO)B(S₂CNEt₂)₂NO](B = NH₃, pyridine). Likely stereochemistries are discussed. New tungsten complexes have been prepared by photochemical reactions of cis-[W(S₂CNEt₂)₂(NO)₂] to give [WL₂(S₂CNEt₂)₂NO]^-, [WL(S₂CNEt₂)₂(Me₂SO)NO](L = NCO^-, N₃-, NCS^-) and [W(NCO)(S₂CNEt₂)₂(MeCONMe₂)NO]. Assignments for the nitrosyl infrared bands in cis-[MO(S₂CNEt₂)₂(NO)₂] and [Mo(NCO)(S_,CNEt₂)₂(Me₂SO)NO] havebeen made by using ¹⁵NO labelled ligands.