Studies of the 24-electron nido-5-vertex clusters [M(eta(4)-P2C2Bu2t)] (M = Ge, Pb, Sn): Synthesis and characterization of M eta(4)-P2C2Bu2t] (M = Ge, Pb), [Sn(eta(4)-P2C2Bu2t){W(CO)(5)}(n)] (n = 1, 2), and [I2GeP2C2Bu2t] and the Mossbauer spectrum o

摘要

The group 14 1,3-diphosphacyclobutadienyl complexes [M(eta(4) -P2C2Bu2t)] (M = Ge, Ph) have been synthesized by the reaction of [Zr(eta(5)-C5H5)(2)(PCBut)(2)] with GeCl2.(dioxane) or PbI2 and fully characterized by multinuclear NMR spectroscopy and single-crystal X-ray diffraction studies. Structurally they can be viewed as 24-electron nido-5-vertex clusters. The significant solvent dependence of the Pb-207 chemical shift of [Pb(eta(4)-P2C2Bu2t)] suggests the possibility of formation of an adduct with Lewis bases. The oxidative addition of [Ge(eta(4) P2C2Bu2t)] with 12 has been studied as well as the reactivity of the previously reported tin analogue [Sn(eta(4)-P2C2Bu2t)] with [W(CO)(5)(THF)] in which it coordinates via its P lone pairs. The Mossbauer spectrum of [Sn(eta(4)-P2C2Bu2t)] is reported and shows an isomer shift consistent with it being an organo tin(II) complex. [References: 28]