Oligo with nonlinear

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. 

A series of PAI have been condensed using trimellitic acid and also 3-amino-4-methylbenzoic acid and various diamines. It was found that the permeability or helium increases with increasing fluorine content. In addition, nonlinear moieties contribute to the permeability. In PAI with oligo(tetrafluoroethene) segments, the substitution patterns of the phenyl group in the diamine moieties do not notably influence the diffusivity." ... 

While results for almost all metal carbonyl complexes have been reported as P values, data for several complexes are available as (i-p products, and these are collected in Table IV, with efficient examples depicted in Fig. 6. Nonlinearities for these diiron complexes with oligo-ene barbiturate units increase on increasing the 7i-system length, as expected. 

---