title: Solid-state 119Sn NMR and Mössbauer spectroscopy of "distannynes": evidence for large structural differences in the crystalline phase.
abstract: The "distannynes" Ar'SnSnAr' (Ar' = C6H3-2,6(C6H3-2,6-Pr(i)2)2) and ArSnSnAr (Ar = C6H3-2,6(C6H2-2,4,6-Pr(i)3)2) were examined by solid-state (119)Sn NMR and Mössbauer spectroscopy. The two compounds display substantially different spectroscopic parameters, while differing only in the absence (Ar'SnSnAr') or presence (ArSnSnAr) of a para-Pr(i) group in the flanking aryl rings of their terphenyl substituents. The spectroscopic differences can be interpreted in terms of a more trans-bent geometry and a longer Sn-Sn bond for ArSnSnAr in comparison to the wider Sn-Sn-C angle (125.24(7) degrees ) and shorter Sn-Sn bond length (2.6675(4)A) determined from the crystal structure of Ar'SnSnAr'. The differences are consistent with previously published calculations by Nagase and Takagi for ArSnSnAr.
authors.affiliation: Department of Chemistry, University of California, Davis, California, 95616, USA.
authors.forename: Geoffrey H
authors.initials: GH
authors.lastname: Spikes
authors.forename: Jason R
authors.initials: JR
authors.lastname: Giuliani
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Augustine
authors.forename: Israel
authors.initials: I
authors.lastname: Nowik
authors.forename: Rolfe H
authors.initials: RH
authors.lastname: Herber
authors.forename: Philip P
authors.initials: PP
authors.lastname: Power