Comparative studies on structure–nonlinearity relationships in a series of novel second-order nonlinear optical chromophores with different aromatic amine donors

摘要: Abstract A series of second-order nonlinear optical chromophores containing an identical π-bridge and electron acceptor but different, aromatic amine electron-donating groups have been synthesized systematically investigated. The donors studied here include traditional carbazole, triphenylamine N,N-diethylaniline novel donor phenothiazine, phenoxazine N-(4-methoxyphenyl)phenoxazine. ultraviolet absorption, solvatochromic, redox properties, density functional theory calculations, thermal stabilities electro-optic activities these were to compare the strength illustrate structure–performance relationships within six chromophores. results show that new stronger ability than donors. Moreover, they reduced energy gap, much larger molecular quadratic hyperpolarizability (μβ) r33 value. Exemplified by N-(4-methoxyphenyl)phenoxazine chromophore, it showed nearly three times higher μβ more four value N-hexylcarbazole chromophore.