Heavy atom effect zeolite

Figure 37 Heavy-atom effect in zeolites singlet versus triplet photochemistry.

L. S., Lakshmi, S., and Ramamurthy, V. (2003) Triplet photochemistry within zeolites through heavy atom effect sensitization and light atom effect. Tetrahedron, 59 (30), 5763-5772. 

The triplet state photophysics of naphthalene and a,u-diphenylpolyenes photogenerated in trapped heavy cation exchanged zeolites have been characterized. 0 The application of the modified zeolite environment provides a powerful new method for induction and observation of external heavy atom effects. Triplet excitation energy transport kinetics in vapour deposited naphthalene has been followed by an analysis of the kinetics of phosphorescence and delayed fluorescence. The assorted decays... 

Sadeghpoor, R., Ghandi, M., Najafi, H.M., and Farzaneh, F. (1998) The oxa-di-jt-methane rearrangement of p.y-unsaturated ketones induced by the external heavy atom cation effect within a zeolite. Chemical Communications, (3), 329-330. 

Very often atoms of heavy elements, such as 4d and 5d metals, form a part of these surface systems, either as adsorbate or substrate. In many cases, an accurate description of the electronic structure and chemical features should take relativistic effects into account. Several relativistic DF studies performed in our group, outlined in the following, comprise supported heavy metal species on ionic metal oxides MgO and AI2O3 as weU as in zeolite cavities metal and gas phase molecules interactions with metal surfaces will also briefly be addressed. For details we refer the reader to the original publications cited below and recent review articles devoted to supported metal particles on metal oxides and in zeolites [250,251]. 

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