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We present here the first results that show the different thermal stabilities of the complex (eta6-benzene)tricarbonylchromium(0), [Cr(eta6-C6H6)(CO) 3], when anchored at different sites inside the alpha-cages of zeolite Na56Y, sites 1 and 2. When the system is heated under dynamic vacuum, the complex anchored at site 1, in which the interactions C6H6-Na+ and Na+-OC are stronger, decomposes slower than the complex anchored at site 2, in which such interactions are weaker. When the system is heated under static vacuum, the rates of decomposition of the complex anchored in both sites are comparable. The complex inside Na56Y is less stable than the same complex in the solid state.Apresentamos aqui os primeiros resultados que mostram a diferença de estabilidade térmica do complexo (eta6-benzeno)tricarbonilcromo(0), [Cr(eta6-C6H6)(CO) 3], quando ancorado em sítios diferentes dentro das cavidades alfa do zeólito Na56Y, sítios 1 e 2. Quando o sistema é aquecido sob vácuo dinâmico, o complexo ancorado no sitio 1, onde as interações C6H6-Na+ e Na+-OC são mais fortes, decompõe mais rapidamente que o complexo ancorado no sitio 2, onde tais interações são mais fracas. Sob vácuo estático, a velocidade de decomposição do complexo nos dois sítios é quase a mesma. O complexo no interior de Na56Y é menos estável que o mesmo complexo no estado sólido

Thermal decomposition of (eta6-Benzene)tricarbonylchromium(0) inside the a-cages of the Na56Y zeolite