We have investigated the effect of solvent polarity on the conformations of two zwitterions. A Nuclear Magnetic Resonance (NMR) study shows that changing the solvent results in large intramolecular charge transfer. However NMR measurements indicated that a benzenoid ring structure predominates the ground state structure for both zwitterions in polar and non polar solvents. In spite of their very different solvatochromic behaviors, both compounds present a sharp enhancement of the quadratic hyperpolarizability on increasing the solvent polarity.

Date Published: 23 September 1994
PDF: 9 pages
Proc. SPIE 2285, Nonlinear Optical Properties of Organic Materials VII, (23 September 1994); doi: 10.1117/12.187499

Published in SPIE Proceedings Vol. 2285:
Nonlinear Optical Properties of Organic Materials VII
Gustaaf R. Moehlmann, Editor(s)