title: Flexible coordination of the carboxylate ligand in tin(II) amides and a 1,3-diaza-2,4-distannacyclobutanediyl.
abstract: A series of tin(II) amido complexes possessing m-terphenyl carboxylate ligands have been prepared. These complexes, namely [(Me(3)Si)(2)NSn(mu-O(2)CC(6)H(2)Ph(3))](2), [(Me(3)Si)(2)NSn(mu-O(2)CC(6)H(3)Mes(2))](2), and [(Me(3)Si)(2)NSn(mu-O(2)CC(6)H(2)Mes(2)Me)](2) [Mes = 2,4,6-trimethylphenyl], are the first structurally characterized examples of tin(II) carboxylate complexes exhibiting discrete Sn(2)O(4)C(2) heterocyclic cores. Initial reactivity studies led to the isolation of a 1,3-diaza-2,4-distannacyclobutanediyl, [(Mes(2)C(6)H(3)CO(2))Sn(mu-NSiMe(3))](2). This molecule possesses a Sn(2)N(2) heterocyclic core and it was crystallised as both the CH(2)Cl(2) and Et(2)O 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 (CH(2)Cl)(Cl)Sn[N(SiMe(3))(2)](2), the product of oxidative addition of CH(2)Cl(2) to Sn[N(SiMe(3))(2)](2), is also presented herein.
authors.affiliation: Department of Chemistry, Simon Fraser University, Burnaby, BC, Canada.
authors.forename: Diane A
authors.initials: DA
authors.lastname: Dickie
authors.forename: Peter T K
authors.initials: PT
authors.lastname: Lee
authors.forename: Ojisamola A
authors.initials: OA
authors.lastname: Labeodan
authors.forename: Gabriele
authors.initials: G
authors.lastname: Schatte
authors.forename: Noham
authors.initials: N
authors.lastname: Weinberg
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Lewis
authors.forename: Guy M
authors.initials: GM
authors.lastname: Bernard
authors.forename: Roderick E
authors.initials: RE
authors.lastname: Wasylishen
authors.forename: Jason A C
authors.initials: JA
authors.lastname: Clyburne