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Synergistic Effect of π-Conjugated [C(NH2)3] Cation and Sb(III) Lone Pair Stereoactivity on Structural Transformation and Second Harmonic Generation
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-11-19 , DOI: 10.1021/acs.inorgchem.1c03050
Man Zhang 1 , Bingbing Zhang 1 , Daqing Yang 1 , Ying Wang 1
Affiliation  

The search for nonlinear optical (NLO) crystals with excellent comprehensive properties is a formidable challenge. In this work, two guanidine antimony fluorides, C(NH2)3Sb2F7 and C(NH2)3SbF4, were obtained by conjunction of [C(NH2)3] groups with π-conjugated configuration and stereochemically active Sb3+ cations. Due to the different coordination modes of Sb–F bonds and H–F hydrogen bonds, the crystal structure of C(NH2)3Sb2F7 is centrosymmetric (CS), while C(NH2)3SbF4 is noncentrosymmetric (NCS). Optical measurements show that the UV cutoff wavelengths of the title compounds were both less than 240 nm. Thermal studies indicate that these crystals are stable up to 250 °C. In addition, the second harmonic generation (SHG) response of C(NH2)3SbF4 is 2 times that of KH2PO4 (KDP) with the phase-matchable capacity. Theoretical calculations reveal that the large SHG effects of C(NH2)3SbF4 were attributed to the synergy between the planar [C(NH2)3] units and the distorted [SbF4] groups. These results demonstrate that the guanidine antimony fluorides will have potential value as UV NLO materials.

中文翻译:

π-共轭 [C(NH2)3] 阳离子和 Sb(III) 孤对立体活性对结构转换和二次谐波产生的协同作用

寻找具有优异综合性能的非线性光学 (NLO) 晶体是一项艰巨的挑战。在这项工作中,通过具有π-共轭构型的[C(NH 2 ) 3 ] 基团和立体化学结合,获得了两种胍锑氟化物,C(NH 2 ) 3 Sb 2 F 7和C(NH 2 ) 3 SbF 4。活性 Sb 3+阳离子。由于Sb-F键和H-F氢键的配位模式不同,C(NH 2 ) 3 Sb 2 F 7的晶体结构呈中心对称(CS),而C(NH 2) 3 SbF 4是非中心对称的 (NCS)。光学测量表明标题化合物的 UV 截止波长均小于 240 nm。热研究表明,这些晶体在高达 250 °C 的温度下是稳定的。此外,C(NH 2 ) 3 SbF 4的二次谐波产生(SHG)响应是具有相位匹配容量的KH 2 PO 4 (KDP)的2倍。理论计算表明,C(NH 2 ) 3 SbF 4的大SHG效应归因于平面[C(NH 2 ) 3 ]单元和扭曲的[SbF 4 ]单元之间的协同作用] 组。这些结果表明胍锑氟化物将具有作为 UV NLO 材料的潜在价值。
更新日期:2021-12-06
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