Stibinidene complexes

An intriguing 3-coordinate organoantimony compound, which is the first example of trigonal-planar Sb, has been characterized. " The stibinidene complex [PhSb Mn(CO)2(rj -CsH5))2] has been isolated as shiny golden metallic crystals (mp 128°) from the crown-ether catalysed reaction ... 

Arsinidene and stibinidene complexes. Arsenic and antimony in their +1 oxidation state can be stabilized by a metal-arsenic (or antimony) n bond with a trigonal planar coordination. PhE[Mn(CO)2Cp]2 was prepared as its arsenic " and antimony derivatives . 

Low-coordination organoantimony compounds are species with the coordination numbers 1 or 2 at the antimony centers, for example, stibinidenes R-Sb, distibenes R-Sb=Sb-R, stibaalkenes, R-Sb=CR2, or cyclic compounds. Stable monomeric stibinidenes or stibaalkenes are not known. Complexes with stibinidene ligands are, however, well established, and trapping of a sterically hindered stibinidene, RSb, R = 2,4,6-(MesSi)2CH]3C6H2 is achieved as a cycloadduct... 

Table 15.6 Geometric parameters of selected structurally characterized stibinidene and bismuthinidene complexes.

As coordinatively unsaturated species, four-electron donor stibinidenes and bismuthinidenes readily form adducts with neutral and anionic donors. The stabilizing effect of these interactions has been exploited to prepare otherwise unisolable pnictinidene complexes by addition of Lewis bases [227]. This Lewis base stabilization can also originate from a pendant donor group [30, 62, 233]. This last... 

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