Studies in aryltin chemistry Part XIV. Crystal and molecular structures oftris(o-methoxyphenyl)tin(IV) chloride, fluoride and oxide

Full crystal structures are reported for the tris(o-methoxyphenyl)tin compo unds, (o-CH3OC6H4)(3)SnX [X = Cl (A), F (B)] and [(o-CH3OC6H4)(3)Sn](2)O (C ), together with both solid-state and solution (CDCl3 Sn-119 NMR data for B and C as well as (Mes)(3)SnF and [(o-Tol)(3)Sn](2)O. Compound B like A is monomeric with a similar but not identical arrangement of aryl groups aroun d the tin while NMR data indicate that B has almost the same geometry in so lution as in the solid state. The anomalously lower frequency delta(Sn-119) value for B is consistent with the more ionic character of the Sn-F bond c ompared with other Sn-X (X = Cl, Br, I) bonds. Compound C is the first (Ar3 Sn)(2)O with an Sn-O-Sn bond angle between 140 and 180 degrees. The compari son of solid-state with solution (2)J(Sn-119,Sn-119) values for C and [(o-T ol)(3)Sn](2)O suggests that the solid state favours structures having large r Sn-O-Sn angles. Reacting C with water gives (o-CH3OC6H4)(3)SnOH only in s olution, identified by its C-13 and Sn-119 NMR spectra. (C) 1999 Elsevier S cience S.A. All rights reserved.