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The incorporation of Crlll into the framework of high content silica zeolite is confirmed by electron spin resonance and photoacoustic spectroscopies.

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The first kinetic study is reported for archetypical substitution reactions of PMe3 and 13CO with the well defined intrazeolite system, M~(l * c o)~-N a~~Y , for which excellent isosbestic points and first order behaviour are obtained, the activation parameters indicate a highly ordered 'supramolecular' transition state consisting of activated M o (~* C O)~ and PMe3 or 13CO all anchored to the Na+ ions in the a-cage of the host lattice.

An electron paramagnetic resonance (EPR) study of crystalline chromosilicalite has been presented with the purpose of characterization of t h e distribution of Cr3+ sites in the solid. In addition, a deconvolution process is described whereby the EPR parameters can be analysed. 135.