Abstract
A novel series of diamino imidazole-type chromophores has been synthesized, which can be chemically incorporated into polymer matrices. Furthermore, their molecular optical nonlinearity, transparency and thermal stability were determined and studied comparatively. Theoretical calculation and experimental results indicate that good nonlinearity-transparency- thermal stability is well balanced in chromophore 4, which possesses a µgβ0 of 554.8×10 -48 esu, a rather blue-shifted absorption peak at 384 nm in THF, and a high decomposition temperature Td of 377°C. It is strongly suggested from these results that multiple substitution strategy should be useful for designing novel NLO chromophores.
Highlights
Organic molecules with large first hyperpolarizabilities (β) have drawn considerable attention over the last 20 years for their potential applications in optical data storage, telecommunications and optical signal processing[1,2]
Significant progress has accrued in the design and synthesis of such onedimensional dipole chromophores[7,8], other properties, such as transparency, thermal stability and capability to be incorporated into bulk materials must be optimized
Chromophores, the increase in NLO response is usually accompanied by bathochromic shifts of the maximum absorption peak and decrease in thermal stability
Summary
Organic molecules with large first hyperpolarizabilities (β) have drawn considerable attention over the last 20 years for their potential applications in optical data storage, telecommunications and optical signal processing[1,2]. It is recognized that imidazole derivatives exhibit excellent thermal stability and solubility in conventional organic solvents.[11] it is possible to incorporate the chromophore into a polymer backbone, if two aminophenyl groups are introduced into the 4- and 5-positions of the imidazole ring. Chromophore 4, which bears two imidazole groups, is an X-type dual charge transfer (CT) system, which is favorable to obtain balanced nonlinearity-transparency-thermal stability properties.
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