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B.J. Coe, J.A. Harris, I. Asselberghs, K. Wostyn, K. Clays, A. Persoons, B.S. Brunschwig, S.J. Coles, T. Gelbrich, M.E. Light, M.B. Hursthouse and K. Nakatani Quadratic Optical Nonlinearities of N-Methyl and N-Aryl Pyridinium Salts Advanced Functional Materials 13

Version of Record online: 30 APR 2003 | DOI: 10.1002/adfm.200300026

The static first hyperpolarizabilities of dipolar pyridinium chromophores are greatly increased by a combination of N-arylation and conjugation extension, according to Stark spectroscopic and hyper-Rayleigh scattering data. The salt trans-N-phenyl-4-(4-dimethylaminophenyl-4-buta-1,3-dienyl)pyridinium hexafluorophosphate (see Figure) crystallizes noncentrosymmetrically and gives intense second harmonic generation.

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