Quadratic Optical Nonlinearities of N-Methyl and N-Aryl Pyridinium Salts (pages 347–357)
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
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.