Fig. 2 Cyclic voltammogram of polymer 3 in PC with 0.1 mol l 21 Bu 4 NBF 4 ; sweep rate, 100 mV s 21Fig. 3 Spectral change during electrochemical BF 4 2 doping of polymer 3. Applied voltage: (a) 0 , (b) 1.0 and (c) 1.2 V.

A series of mono- and bisazo dyes were synthesized to obtain soluble, thermally stable, and enhanced second-order nonlinear optical chromophores (NLOphores). To prepare good sol-gel films, the most important factor was the solubility of NLOphores. Those azo NLOphores showing sufficient solubility were further classified into three groups: non-nitro-containing, nitro-containing, and fluorine-containing derivatives. Though non-nitro-containing NLOphores showed high solubility, their second-order nonlinearity was low. Nitro-containing NLOphores showed a rather high Td and a medium nonlinearity. Fluorine-containing NLOphores, especially perfluoroalkylsulfonyl derivatives, showed high nonlinearity and a rather low Td.

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Azo dyes Azo dyes T 0200Survey of Enhanced, Thermally Stable, and Soluble Second-Order Nonlinear Optical Azo Chromophores. -Twenty-one mono-and bisazo dyes are prepared to obtain nonlinear optical chromophores with improved physical properties. Compounds showing sufficient solubility in ethanol are classified into three groups: non-nitro-containing, nitro-containing, and fluorine-containing derivatives. Non-nitro-containing NLOphores display high solubility, but low second-order nonlinearity, cf. (Ia). Nitro-containing NLOphores (Ib) and (Ic) show a rather high decomposition temperature and medium nonlinearity. Fluorine-containing NLOphores (Id) and (Ie) reveal high nonlinearity and a rather low decomposition temperature. A transparent and homogeneous sol-gel film is prepared from (Ic) by an acid-catalyzed process. -(MATSUI*, M.; SUZUKI, M.; HAYASHI, M.; FUNABIKI, K.; ISHIGURE, Y.; DOKE, Y.; SHIOZAKI, H.; Bull. Chem. Soc. Jpn. 76 (2003) 3, 607-612; Dep. Mater. Sci. Technol., Fac. Eng., Gifu Univ., Yanagido, Gifu 501-11, Japan; Eng.) -H. Hoennerscheid 24-149