METAL-COMPLEXES IN A CONSTRAINED ENVIRONMENT - 197AU MOSSBAUER STUDY AND CHEMICAL BEHAVIOR OF THE AU[S=C(NH2)2]2-EXCHANGED IN UNPILLARED AND IN ALUMINUM PILLARED SYNTHETIC BEIDELLITE CLAY( CATION)

Intercalation of the gold thiourea (T) complex, AuT2+, into beidellite clay and aluminium pillared beidellite was studied by Au-197 Mossbaue r spectroscopy, X-ray diffraction and infrared spectroscopy. At a conc entration close to the cation exchange capacity, the AuT2+ complexes a re found to be oriented diagonal to the clay sheets, while at a much l ower concentration and in the pillared beidellite they lie flat in the interlayer spacing. Thermal decomposition of the intercalated AuT2+ w as studied at temperatures up to 400 degrees C.