Derivatives of bivalent germanium, tin, and lead. Part XX. Complex formation between tin(II) compounds and tetracyanoethylene, 7,7,8,8- tetracyanoquinodimethane, and 2,3,5,6-tetrachlorobenzoquinone

Abstract

Complexes of tin(II) halides and bis(β-ketoenolates), bis(cyclopentadienyi)tin(II), and triethylammonium trichlorostannate(II) with tetracyanoethylene (tcne), 7,7,8,8-tetracyanoquinodimethane (tcnq), and 2,3,5,6- tetrachlorobenzoquinone (tcbq) have been synthesised and examined by i.r. and tin-119m Mössbauer spectroscopy. Complexes of [Sn(C₅H₅)₂] with tcne and tcnq are formulated as charge-transfer complexes involving the π-electron system of the cyclopentadienyl rings, whereas the complexes [SnX₂(tcne)·thf](X = Cl, Br, or I) and [NEt₃H][SnCl₃(tcne)] are considered to contain a tin-substituted radical species. Linear chain structures in which theoraanicmolecule bridaes adiacenttin atoms are proposed for the complexes of tin(II) bis(β-ketoenolates) with tcne, tcbq, and tcnq.