Grafting of cobalt porphyrins in sol-gel matrices: application to the detection of amines

Grafting in a sol-gel matrix is of interest since it provides materials whi ch are transparent with a good optical quality and which are compatible wit h the use of optical fibers in spectroscopic detection. Grafting of cobalt( II)porphyrins in a sol-gel matrix was realized using a porphyrin substitute d by a triethoxysilyl group and pure tetramethoxysilane as the precursor. C omparison was achieved between grafted and non-grafted porphyrins. Prelimin ary results on pyridine sensing show that the diffusion of pyridine occurs with a lower rate than in organic matrices. (C) 2000 Elsevier Science S.A. All rights reserved.