Achieving great optical anisotropy with the well-directed alignment of -conjugated groups due to hydrogen bonds
JOURNAL OF SAUDI CHEMICAL SOCIETY(2024)
摘要
Looking for novel UV birefringent units with great birefringence and discovering new candidates that are constructed by them have always been a hotspot in the field of optical materials. Here, a new imidazole-based [C3N2H5]2C2O4 center dot H2O crystal is synthesized with a cutoff edge (274 nm). According to achieve the welldirected alignment, the millimeter-sized single crystal [C3N2H5]HC2O4 is obtained and possesses a larger birefringence than [C3N2H5]2C2O4 center dot H2O with a similar band gap. What's more, the [C3N2H5]HC2O4 crystals can be grown by a simple aqueous solution volatilization method, and the difference in the measured refractive index of [C3N2H5]HC2O4 is 0.119@546 nm which is similar to the birefringence of the famous alpha-BBO crystal. The birefringence originates from the pi-conjugated [C3N2H5] units and [HC2O4] units, which implies [C3N2H5]HC2O4 is promising candidates for exploring UV materials with large birefringence.
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关键词
Birefringent material,Optical anisotropy,Synthesis design,Crystal growth
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