Molecular structures of organotin tropolonato complexes with tin coordination numbers 5–7, seen by single-crystal x-ray diffraction and solid- and solution-state 119Sn NMR
✍ Scribed by Carlos Camacho-Camacho; Rosalinda Contreras; Heinrich Nöth; Matthias Bechmann; Angelika Sebald; Wolfgang Milius; Bernd Wrackmeyer
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 272 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.975
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✦ Synopsis
Abstract
Organotin tropolonato complexes of the type R~3~Sn(trop) 1 [R = Bu (b), Ph (c)], R~2~Sn(trop)~2~ 2 [R = Me (a), Bu (b), Ph (c)] and RSn(trop)~3~ 3 [R = Bu (b), Ph (c)] were studied by single‐crystal X‐ray diffraction (1c, 2a,b, 3b), ^13^C and ^119^Sn MAS NMR and ^119^Sn NMR in solution. The tin coordination numbers from 5 to 7, as determined for the solid state, are retained in solution. The different distorted octahedral surroundings (cis‐like arrangement of the methyl groups in 2a; trans‐like arrangement of the butyl groups and weak intermolecular association in 2b) of the tin atoms in solid compounds 2 are reflected both by the ^119^Sn chemical shift anisotropies and the magnitude of the coupling constants |^1^J(^117/119^Sn,^13^C)|. The molecular structures of 2a and 2b become more similar to each other in solution, as indicated by differences in the isotropic ^119^Sn chemical shifts in solution and in the solid state, and even more obvious by changes in the magnitude of the corresponding coupling constants |^1^J(^117/119^Sn,^13^C)|. Copyright © 2001 John Wiley & Sons, Ltd.