Abstract
2,6-Disubstitute cycloheptimidazole, which possess a low dipole moment in the ground state (μ s ) and large first hyperpolarizability (β), have been designed. These compounds have the reversion of the excited state dipole moment and can he optimized by the donor-acceptor substitution. Of these chromophores studied, 2-dimethylamino-6-nitrocycloheptimidazole (DCNCH) was selected for synthesis and investigations. The experimental values of μ g and β are 5.11D and 34.6×10 -30 esu. respectively. They are good agreement with theoretical results. The second order NLO coefficient (d 33 ) of DANCH-doped polymer film is 12 9) pm/V.
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