Nitrosyl and Thionitrosyl Complexes of Technetium and Rhenium and Their Reactions with Hydrotris(pyrazolyl)borates.

The very limited number of structurally known thionitrosyl complexes of technetium was increased by the synthesis of [Tc(NS)Cl(PPh)] () and [Tc(NS)Cl(PPh)(OPPh)] () and their reaction products with hydrotris(pyrazolyl)borates, {HB(pz)}. Similar reactions were conducted with [Tc(NO)Cl(PPh)(CHCN)] and related rhenium thionitrosyls. Remarkably, most such reactions result in a rapid cleavage of the boron-nitrogen bonds of the ligands and the formation of pyrazole complexes of the two group 7 metals.