Rigid, highly conjugated tetraalkynyl-calix[4]arenes synthesised via Sonogashira coupling give rise to improved second-order hyperpolarizability values as determined by hyper-Rayleigh scattering-a technique that in addition to X-ray crystallography also allows for the conformational analysis of the calixarene structures in solution.
G. Hennrich, M. T. Murillo, P. Prados, K. Song, I. Asselberghs, K. Clays, A. Persoons, J. Benet-Buchholz, J. de Mendoza
Chem. Commun. 2005, 2747-2749
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