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Third-Order Nonlinear Optical Properties and Electroabsorption Spectra of an Organic Biradical, [Naphtho[2,1‑d:6,5‑d′]bis([1,2,3]dithiazole)]

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journal contribution
posted on 27.02.2014, 00:00 by Keigo Takauji, Rie Suizu, Kunio Awaga, Hideo Kishida, Arao Nakamura
Thin films of a thiazyl biradical, naphtho­[2,1-d:6,5-d′]­bis­([1,2,3]­dithiazole), abbreviated as NT, exhibit nonlinear optical properties with a large third-order nonlinear susceptibility of 2.1 × 10–11 esu. The electroabsorption and low-temperature-absorption measurements reveal a series of degenerate electronic states, which is probably caused by the biradical character of NT. It is concluded that this degeneracy should enhance the third-order nonlinear optical properties.