title: The unexpected motional isotropy of the tin atom in a tricoordinate stannylium cation.
abstract: The dynamics of the metal atom in the recently isolated tricoordinate tin complex tris(2,4,6-triisopropylphenyl)stannylium tetrakis(pentafluorophenyl)borate was examined by temperature-dependent (119)Sn Mössbauer spectroscopy over the temperature range 90 K < T < 170 K. Contrary to expectation, the metal atom motion in this temperature range is isotropic within experimental error of the Mössbauer data, and is only moderately anisotropic, even at 293 K, as evidenced by single crystal X-ray diffraction data. The hyperfine parameters at 90 K are completely consistent with trigonal coordination involving sp(2) hybridization of the 5s5p bonding orbitals of tin.
authors.affiliation: Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
authors.forename: Joseph B
authors.initials: JB
authors.lastname: Lambert
authors.forename: Lijun
authors.initials: L
authors.lastname: Lin
authors.forename: Israel
authors.initials: I
authors.lastname: Nowik
authors.forename: Rolfe H
authors.initials: RH
authors.lastname: Herber