title: Coordination chemistry of N-heterocyclic stannylenes: a combined synthetic and Mössbauer spectroscopy study.
abstract: The N-heterocyclic stannylenes (NHSns), [(Dipp) N(CH(2))(n)N(Dipp)S n] (Dipp = 2,6- (i)Pr(2)C(6)H(3); n = 2, 1; n = 3, 5) and [((t)Bu) N(CHMe)(2)N((t)Bu)S n] (10) are competent ligands toward a variety of transition metal centers, as seen in the complexes [W(CO)(5)·1] (2), [(OC)(4)Fe(μ-1)(2)Fe(CO)(4)] (3), [(OC)(4)Fe(μ-1)Fe(CO)(4)] (4), [Fe(CO)(4)·5](n) (6, n = 1 or 2), [(OC)(4)Fe(μ-5)Fe(CO)(4)] (7), [Ph(3)PPt(μ-1)(2)PtPPh(3)] (8), [Fe(CO)(4)·10] (11), and [(η(5)-C(5)H(5))(OC)(2)Mn·10] (12). X-ray crystallographic studies show that the NHSns are structurally largely unperturbed binding to the metal, but in contrast to the parent NHCs, NHSns often adopt a bridging position across dinuclear metal units. The balance between terminal and bridging positions for the stannylene is evidently closely balanced as shown by the observation of both monomers and dimers for 6 in the solid state and in solution. (119)Sn and (57)Fe Mössbauer spectroscopy of the complexes shows the tin atoms in such complexes to be consistent with electron deficient Sn(II) centers.
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol, #BS8 1TS, UK.
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Mansell
authors.forename: Rolfe H
authors.initials: RH
authors.lastname: Herber
authors.forename: Israel
authors.initials: I
authors.lastname: Nowik
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Ross
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Russell
authors.forename: Duncan F
authors.initials: DF
authors.lastname: Wass
mesh_terms: D018360:Crystallography, X-Ray; D006571:Heterocyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009947:Organotin Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D015204:Spectroscopy, Mossbauer; D013237:Stereoisomerism
chemical_list: D006571:Heterocyclic Compounds; D009947:Organotin Compounds