Organotin biocides. Part 2. Variable-temperature 119Sn Mössbauer study of phenyl- and cyclohexyl-tin compounds

Abstract

The temperature dependence of the recoil-free fraction (a=–d In f/dT) for 13 phenyl- and 11 cyclohexyl-tin compounds has been investigated, and the results interpreted in terms of the lattice structures of the compounds. This interpretation is aided by a classification of organotin polymers based upon the stereochemical disposition of tin and the bridging groups. Lattices based upon non-interacting units, or polymers which are helical (Class 4) or ‘S’-shaped (Class 3), show the highest a values. The value of this parameter is generally reduced for zigzag (Class 2) polymers, while the most rigid lattices (lowest a) are based upon a rod-like (Class 1) architecture.