Abstract
Third-order optical nonlinearity of a biradical molecule with open-shell π-electron system, 1,4-bis- (4,5-diphenylimidazole-2-ylidene)-cyclohexa-2,5-diene (BDPI-2Y) was investigated by the third-harmonic generation method. The figure of merit for third-order optical nonlinearity in BDPI-2Y is comparable to those for conjugated polymers, which have elongated closed π-conjugated systems. This indicates that the biradical nature of BDPI-2Y enhances third-order optical nonlinearity.
Published Version
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