We herein report an unprecedented organic–inorganic hybrid borate incorporating a novel nonlinear-optical (NLO) active unit, namely, [C(NH₂)₃][B(C₂O₂H₄)₂]. The novel NLO active unit was derived from the condensation reaction between two glycol molecules and one (BO₄)^5– group. The title compound exhibits a moderate second-harmonic-generation effect (0.7 × KDP), a significant band gap (5.76 eV), and a suitable birefringence (0.078 at 550 nm). The optical properties are determined by the synergistic interaction between the C(NH₂)₃⁺ cation and the [B(C₂O₂H₄)₂]⁻ group, as indicated by theoretical calculations.

中文翻译：

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[C(NH2)3][B(C2O2H4)2]：一种含有非线性光学活性单元 [B(C2O2H4)2]− 的有机-无机杂化硼酸盐，具有日盲区光学非线性


我们在此报道了一种前所未有的有机-无机杂化硼酸盐，它结合了一种新型非线性光学（NLO）活性单元，即[C(NH ₂ ) ₃ ][B(C ₂ O ₂ H ₄ ) ₂ ]。新型NLO活性单元源自两个乙二醇分子和一个(BO ₄ ) ^5-基团之间的缩合反应。标题化合物表现出中等的二次谐波产生效应（0.7 × KDP）、显着的带隙（5.76 eV）和合适的双折射（550 nm 处为 0.078）。如理论计算所示，光学性质由C(NH ₂ ) ₃ ⁺阳离子和[B(C ₂ O ₂ H ₄ ) ₂ ] ^-基团之间的协同相互作用决定。