On the nature of "RuCl(dmso) 2 {HB(mt) 3 }" (mt = methimazolyl)

Abstract

The high-yield product of the reaction of [RuC12(dmso), 4] (dmso = dimethylsulfoxide) with Na[HB(mt)3] (mt = methimazolyl) is not, as reported, the complex [RuCl(dmso)2{? 3-S,S',S"-HB(mt)3}] but rather the isomeric [RuCl(dmso) 2{?:3-H,S,S'-HB(mt)3}], which features a three-center, two-electron B-H-Ru interaction, as also found for the complex [RuH(PPh 3)2{k3-H,S,S-H2B(mt)2}], which results from [RuHCl(PPh3)3] and Na[H 2B(mt)2].