Tin tetrachloride chelates with 4-dimethylaminobenzaldehyde pyridinoylhydrazones. Molecular and crystal structures of [SnCl4(γ-Idb • H)] • CH3CN and [SnCl4(γ-Idb • H)] • DMF

The reactions of SnCl4 with 4-dimethylaminobenzaldehyde pyridinoylhydrazones (alpha-HPdb, beta-HNdb, and gamma-HIdb) afford complexes [SnCl4(Pdb center dot H)] (I); [SnCl4(Ndb center dot H)] center dot nSolv, Solv = 0 (II), CH3OH (IIa); and [SnCl4(Idb center dot H)] center dot nSolv, Solv = 0 (III), CH3OH (IIIa), CH3CN (IIIb), DMF (IIIc). The complexes are thermally stable to 310-340A degrees C, and desolvation occurs in ranges of 145-190A degrees C (CH3OH), 160-230A degrees C (CH3CN), and 160-190A degrees C (DMF). It is found by IR spectroscopy that the complexes include the form of ligands protonated at N(Py), where the ligands are bonded to tin according to the bidentate-cyclic mode through the azomethine nitrogen atom and the oxygen atom of the oxyazine group. The molecular and crystal structures of complexes IIIb and IIIc are determined by X-ray diffraction analyses (CIF files CCDC nos. 1055248 and 1055249, respectively).