ChemInform Abstract: Third‐Order Optical Nonlinearities of Model Compounds Containing Benzothiazole, Benzimidazole, and Benzoxazole Units.

Abstract

Third-Order Optical Nonlinearities of Model Compounds Containing Benzothiazole, Benzimidazole, and Benzoxazole Units.-The model compounds (IV) and (V) are prepared analogously to (III). The trend of the optical nonlinearity in (III)-(V) can be related to structural variations. The molecular hyperpolarizability increases very rapidly in quasi-one-dimensional molecules with the length of the conjugated π-system. Incorporation of a sulfur-containing heteroaromatic linkage in the conjugated structure enhances the nonlinearity. The transition from one-dimensional π-electron configuration to two-dimensional systems such as (V) can enhance third-order optical nonlinearity without reducing the optical transparency window. -(ZHAO, M.; SAMOC, M.; PRASAD, P. N.; REINHARDT, B. A.; UNROE, M. R.; PRAZAK, M.; EVERS, R. C.; KANE, J. J.; JARIWALA, C.; SINSKY, M.; Chem. Mater. 2 (1990) 6, 670-678; Dep. Chem.,