Challenging the Auxiliary Donor Effect on Molecular Hyperpolarizability in Thiophene-Containing Nonlinear Chromophores:  X-ray Crystallographic and Optical Measurements on Two New Isomeric Chromophores

To reexamine the established “auxiliary donor” effect of thiophene in nonlinear optical (NLO) chromophores, we have prepared two isomeric donor−acceptor azo dyes, differing only in the position of the thiophene. Experimental analysis of these chromophores, including electric field-induced second har...

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