synthesis and spectroscopic characterization of some new po43-, hpo42- and hpo32- containing organotin (iv) derivatives

Four new organotin (IV) derivatives containing coordinating phosphate, hydrogenophosphate and hydrophosphonate anions have been synthesized and studied by infrared and Mössbauer spectroscopies. Discrete, infinite chain or oligomeric structures have been suggested, the anion behaving as a bi- or a tridentate ligand, the environment around the tin (IV) center being in all cases trans trigonal bipyramidal. The starting HPO3H2 in three cases has turned into phosphate when reacting with SnPh3OH while in the presence of SnMe3OH this oxidation does not occur. Some of the derivatives are hydrated ones while the others are not, the water molecules deriving from the condensation reaction being kept or not in the lattice. The presence of ethylenediamine in a monoprotonated and diprotonated forms and involved in hydrogen bonding in some of the compounds seems noteworthy and may explain the presence of water molecules or not. Supramolecular architectures are obtained when secondary interactions are considered.