The crystal and molecular structures (at –40 °C) of the tetrabenzyls of titanium, hafnium, and tin

Tribenzyl(η5-pentamethylcyclopentadienyl)hafnium(IV)

“…The structures of electronically unsaturated early transition metal benzyl complexes are often distorted by weak MÁ Á ÁPh interactions which lead to reduced MÐCH 2 ÐPh angles and short MÁ Á ÁC ipso contacts. Such 2 -or n -benzyl structures were ®rst observed for M(CH 2 Ph) 4 (M = Ti, Zr, Hf) complexes (Davies et al, 1971;Bassi et al, 1971) and have since been observed in a variety of systems, including cationic group 4 metal benzyl compounds (Jordan et al, 1987(Jordan et al, , 1990Crowther et al, 1993;Bei et al, 1997).…”

Dibenzylmercury

“…C14H14Hg, M r = 382.9, tetragonal, P42/n, Introduction. Studies of the thermal decomposition of dibenzylmercury (Jackson & O'Neill, 1978) raise the possibility that there may be some interaction of the Hg atom with the phenyl ring as in Zr and Hf benzyls (Davies, Jarvis & Kilbourn, 1971). The structure of benzyl(triphenylmethylthio)mercury (Bach, Weibel, Schmonsees & Glick, 1974) shows no such interaction but this could be due to steric effects.…”

Redetermination of the crystal structure of tetrakis(4-chlorobenzyl)tin(IV), C28H24Cl4Sn

“…The crystal structure of the title compound has been described previously based on room temperature data [5,6]. The unsubstituted tetrabenzyls of titanium, hafnium, and tin have also been previously studied [7]. Herein, a low temperature (100 K) redetermination is described for a crystal obtained as a side-product of a reaction involving the (4chlorophenyl) 2 SnCl 2 precursor (see "Source of material").…”