Compostosorganometálicos Deestanho(ii) –Estanilas Dealgunsmetais Representativos

Abstract

ORGANOMETALLICCOMPOUNDSOFTIN(II) –SOMEMAINGROUPMETALSTANNYLS.This paper aimsto summarise some chemical information aboutselected main group metalstannyl compounds. The number of these compoundsin the literature are much fewer than those with transition metal cations. Most papersreport details ofstannyls containing Li(I), Na(I) and K(I),such assynthetic routes, spectroscopic results and their molecular structures. This review comprises not only information of stannyls containing these cations, but also some alkaline-earth species containingMg(II),Ca(II),Sr(II),Ba(II), aswell asSn(II).In some compounds,the alkaline or alkaline earth cation is connected to the stannylfragmentthrough aSn –Mbond, evidenced byX-ray crystallographic data or by solutionorsolid-state 119SnNMRexperiments.The introduction part ofthe papersummarizesthe chemical aspects ofthese compounds and their importance in the organometallic chemistry ofSn(II) as a research area.The second part ofthisreviewis dedicated to a broad discussion of the syntheses and structural aspects ofsomeLi(I),Na(I) andK(I) derivatives.The structure ofsome stannyl compounds ofMg(II),Ca(II), Sr(II),Ba(II) are displayed in the third part ofthis paper.Two rare examples of Sn(II)-based stannyl derivatives are shown in the final part ofthe review.Thisreview also highlights how important it isto correlate X-ray crystallographic data with those obtained by solution- or solid-state 119Sn-NMRexperimentsin orderto determine the degree of covalence in the Sn –Mbond.