Nonlinear optically active dyes

Fischer, P. Koetse, M. Laschewsky, A. Wischerhoff, E. Jullien, L. Persoons, A and Verbiest, T. (2000) Orientation of Nonlinear Optical Active Dyes in Electrostatically Self-Assembled Polymer Films Containing Cyclodextrins, Macromolecules 33, 9471-9473. 

Orientation of nonlinear optical active dyes in electrostatically self-assembled polymer films containing cyclodex-trins was studied. "The concept of molecular recognition of organic chromophores by coordinating polymers was another novel approach in the construction of nonlinear optical supramolecular assemblies. 

Dehydration or Chemical Stabilization. The removal of surface silanol (Si—OH) bonds from the pore network results in a chemically stable ultraporous soHd (step F, Fig. 1). Porous gel—siHca made in this manner by method 3 is optically transparent, having both interconnected porosity and sufficient strength to be used as unique optical components when impregnated with optically active polymers, such as fiuors, wavelength shifters, dyes, or nonlinear polymers (3,23). 

Electrostatic self-assembly was combined with supramolecular chemistry to obtain inclusion complexes of a polymeric nonlinear optical (NLO) active dye and modified [3-cyclodextrin with induced chromophore orientation [37], The polyanion is a N,N-diallyl-aniline and sodium-2-acrylamido-2-methylpropanesulfonate copolymer functionalized with pendant azo group. The modified /i-cyclodextrin oligo-cation was obtained by treatment of hcptakis(6-dco y-6-iodo-/i-cyclodcxtrin) with excess pyridine. A linear polyamine, chitosan, was also combined with the polyanion, for comparison. Films were deposited on glass slides by dipping them alternatively in aqueous solutions of the cation and the polyanion. UV-visible spectra indicate dye aggregation and suggest the formation of an inclusion complex of the dye with the cyclodextrin, thus isolating the chromophores. 

J. Lu, L. Wu, L. Jing, X. Xu, X. Zhang, Synthesis, circular dichroism, and third-order nonlinear optical properties of optically active poiphyrin derivatives bearing four chiral citronellal moieties. Dyes Pigm. 94, 169-174 (2012)... 

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