Abstract

Certain potential pesticides are of limited use because of their sensitivity to sunlight. Previous attempts to overcome this limitation have been unsatisfactory because of impairment of insecticidal efficiency or unwanted toxic properties. The photosensitivity results from the balance between the processes, such as energy transfer and chemical reaction, by which photoexcited molecules can release excess energy and return to the ground state. The efficiency of the various energy transfer mechanisms1–5 depends, in some cases, on the specific spectroscopic characteristics of donor and acceptor molecules, the distance between them and their relative orientations. We present here an approach aimed at protecting compounds of agricultural interest (for example, pesticides) by exploiting the unique surface properties of certain clays in order to build systems in which fast energy transfer occurs before photodegradation starts.

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