B. Lebeau, C. Sanchez
2002
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0
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Journal
MRS Proceedings
Abstract
Interactions between the dye Red 17 (4-(amino-N, N-diethanol)-2-methyl-4'-nitroazobenzene) having nonlinear optical (NLO) properties and metallo-organic sol-gel precursors M(OR) n (M = Ti, Zr, Si and Sn; R = C n H 2n+1 ) have been investigated by means of UV-VIS spectrophotometry and liquid state NMR ( 1 H, 29 Si and 119 Sn) techniques. The presence of titanium, zirconium or tin alkoxides make strong modifications in the UV-VIS absorption spectrum of the Red 17 in solution. On the contrary, when the Red 17 is grafted to alkoxysilyl groups, only minor changes were observed. The resulting bathochromic shift of about 30 nm observed with transition metal or tin alkoxides was found to be due to Lewis acid-base type interactions between the Red 17 and the metallic centre.