Flexible coordination of the carboxylate ligand in tin(ii) amides and a 1,3-diaza-2,4-distannacyclobutanediyl?

Dalton Transactions Pub Date: 2007-05-23 DOI: 10.1039/B704588C

Abstract

A series of tin(II) amido complexes possessing m-terphenyl carboxylate ligands have been prepared. These complexes, namely [(Me3Si)2NSn(μ-O2CC6H2Ph3)]2, [(Me3Si)2NSn(μ-O2CC6H3Mes2)]2, and [(Me3Si)2NSn(μ-O2CC6H2Mes2Me)]2 [Mes = 2,4,6-trimethylphenyl], are the first structurally characterized examples of tin(II) carboxylate complexes exhibiting discrete Sn2O4C2 heterocyclic cores. Initial reactivity studies led to the isolation of a 1,3-diaza-2,4-distannacyclobutanediyl, [(Mes2C6H3CO2)Sn(μ-NSiMe3)]2. This molecule possesses a Sn2N2 heterocyclic core and it was crystallised as both the CH2Cl2 and Et2O solvates. Although the tin atoms in this molecule have a formal oxidation state of 3+, preliminary computational studies on this molecule suggest that it is best described as a ground state singlet. Finally, the X-ray crystal structure of (CH2Cl)(Cl)Sn[N(SiMe3)2]2, the product of oxidative addition of CH2Cl2 to Sn[N(SiMe3)2]2, is also presented herein.

Graphical abstract: Flexible coordination of the carboxylate ligand in tin(ii) amides and a 1,3-diaza-2,4-distannacyclobutanediyl
Recommended Literature