Tin Carboxylates Research Articles

Derivatives of divalent germanium, tin, and lead. Part VIII. Tin(II) aryl-carboxylates, -sulphonates, and halide methoxides

Tin(II) aryl-carboxylates, Sn[O2CR]2, and -sulphonates. Sn[O3SR]2, have been synthesised by reaction of the appropriate acid with tin(II) dimethoxide or bis(methylcyclopentadienyl)tin(II)(R = Me, Et, Ph, or Me-, Cl-, Br-, H2N-, But-, O2N-C6H4, C6F5, or C10H7). Tin(II) carboxylates, when soluble, are monomeric in benzene and in the vapour phase (mass spectra). The i.r. spectra suggest that the carboxylate ligand functions as a bridging group in the solid. The major fragmentation processes in the mass spectra involve stepwise loss of carboxylate groups and also decarboxylation. Tin(II) dimethoxide and tin(II) dihalides readily disproportionate in tetra-hydrofuran to yield tin(II) halide methoxides. Tin-119m Moossbauer data are reported for all compounds.

MÖSSBAUER STUDIES OF TIN(IV) COMPLEXES WITH ANIONIC CHELATING LIGANDS HAVING OXYGEN DONORS

Abstract Mossbauer spectra have been obtained for thirty-two complexes of tin(IV), including those with kojic acid, tropolone, chloranilic acid, benzoic and ortho- and para-chlorobenzoic acids and salicylic acid, as well as o-phenanthroline complexes with the tin(IV) carboxylates. Quadrupole splittings reveal trans C[sbnd]Sn[sbnd]C bonds in all the octahedral diorganocompounds except diphenylbis(kojato)tin(IV) and diphenylbis(tropolonato)tin(IV). Oxygen-tin and pyridine-type nitrogen-tin dative bonds are observed to effect similar electron densities at the tin nucleus. o-Phenanthroline interacts with the carboxylate compounds to replace chelate C[dbnd]O→Sn and H-(c)o→Sn dative bonds by N→Sn bonds.

The Mössbauer effect in tin(II) compounds. Part IV. The spectra of some tin(II) carboxylates and tricarboxylatostannates(II)

The Mossbauer parameters of some tin(II) carboxylates are reported and discussed in terms of the bonding in compounds containing tin–oxygen bonds. There is no consistent agreement between the Mossbauer chemical shift data for these carboxylates and the ionisation constants of the parent acids. The Mossbauer parameters of a number of tricarboxylatostannates(II) are also reported and compared with those for other tin(II) complexes.