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Novel noncentrosymmetric polar coordination compounds derived from chiral histidine ligands
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-08-20 , DOI: 10.1039/d1qi00869b
Wooyoung Seo 1 , Kang Min Ok 1
Affiliation  

Crystals of chiral coordination compounds, [L-C6H10N3O2ZnBr3] (L-ZnBr), [D-C6H10N3O2ZnBr3] (D-ZnBr), [L-C12H20N6O4Cd2Cl5] (L-CdCl), and [D-C12H20N6O4Cd2Cl5] (D-CdCl), have been grown in high yields by using MX2 (M = Zn or Cd; X = Br or Cl) and L- or D-histidine by a slow evaporation method in acidic media. Single crystal X-ray diffraction reveals that while the structures of L-ZnBr and D-ZnBr crystallizing in the polar space group, P21, consist of slightly distorted ZnOBr3 tetrahedra and the respective chiral histidine ligands, those of L-CdCl and D-CdCl with the triclinic noncentrosymmetric (NCS) space group, P1, are composed of distorted CdOCl4 trigonal bipyramids and the corresponding histidine ligands. Whereas the structures of L-ZnBr and D-ZnBr can be extended to pseudo-1D chains via hydrogen bonds, those of L-CdCl and D-CdCl can be assembled to pseudo-3D frameworks through hydrogen bonds and π–π interactions. UV-vis diffuse reflectance spectra suggest that the title compounds have large optical band gaps of ca. 5 eV. The powder second-harmonic generation (SHG) measurements indicate that the new materials with NCS structures have mild SHG efficiencies of ca. 0.2 times that of KH2PO4, and type-I phase-matching behaviors. Circular dichroism spectra have confirmed the absolute configurations of the title compounds further. The synthesis approach suggests a systematic method toward the discovery of novel coordination compounds with NCS structures.

中文翻译:

源自手性组氨酸配体的新型非中心对称极性配位化合物

手性配位化合物晶体,[LC 6 H 10 N 3 O 2 ZnBr 3 ] ( L -ZnBr ), [DC 6 H 10 N 3 O 2 ZnBr 3 ] ( D -ZnBr ), [LC 12 H 20 N 6 O 4 Cd 2 Cl 5 ] ( L -CdCl ) 和 [DC 12 H 20 N 6 O 4 Cd 2 Cl 5 ] (D -CdCl ) 已通过在酸性介质中通过缓慢蒸发方法使用 MX 2 (M = Zn 或 Cd;X = Br 或 Cl) 和L - 或D -氨酸以高产量生长。单晶 X 射线衍射表明,虽然在极性空间群P 2 1 中结晶的L -ZnBrD -ZnBr的结构由轻微扭曲的 ZnOBr 3四面体和各自的手性组氨酸配体组成,但L -CdClD -CdCl具有三斜非中心对称(NCS) 空间群P1,由扭曲的 CdOCl 4三方双锥和相应的组氨酸配体组成。L -ZnBrD -ZnBr的结构可以通过氢键扩展到伪 1D 链,而L -CdClD -CdCl 的结构可以通过氢键和 π-π 相互作用组装成伪 3D 骨架。UV-vis 漫反射光谱表明标题化合物具有约 100倍的大光学带隙5 电子伏特。粉末二次谐波发生 (SHG) 测量表明,具有 NCS 结构的新材料具有约 10倍的温和 SHG 效率KH的0.2倍2 PO 4和I型相位匹配行为。圆二色光谱进一步证实了标题化合物的绝对构型。合成方法提出了一种发现具有 NCS 结构的新型配位化合物的系统方法。
更新日期:2021-09-06
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