Thermal behaviour of Tin(II) complex with 8-hydroxyquinolinate in the solid state

Tin(II) complexes with 8-hydroxyquinolinate in solid state have been obtain ed by adding aqueous ammonium to a solution containing stannous chloride an d 8-hydroxiquinoline in medium of HCl and acetone up to pH 5 and 9, respect ively. The products obtained show the same composition, Sn(C9H6ON)(2); howe ver there are some differences regarding both the thermal behaviour in an o xidant atmosphere and morphology. These products were characterised by elem ental and complexometric analysis, TG and DTA curves, infrared and X-ray di ffractometry. TG curves show, above 448 K, the partial oxidation on air atm osphere of Sn(II) complexes to Sn(IV) complexes, SnO(C9H6ON)(2). This behav iour does not depend only on pH in which the compounds were obtained but al so on the heating rate in TG curves. Sn(II) complexes volatilise almost com pletely on nitrogen atmosphere and partially on air atmosphere depending on the oxidation degree of the compound.