青岛大学尉琪团队报道了源于π共轭单元均匀排列的强双折射层状(C₅H₆ON)₂[Sb₂O(C₂O₄)₃]。相关研究成果发表在2024年4月15日出版的国际学术期刊《结构化学》。

通过将π-共轭的4-羟基吡啶和具有立体化学活性Sb（III）阳离子的(C₂O₄)^2-基团同时结合，成功地获得了有机-无机杂化草酸锑（III）(C₅H₆ON)₂[Sb₂O(C₂O₄)₃]。该化合物具有层状结构，SbO₆单元的赤道平面，π-共轭的(C₂O₄)^2-和(C₅H₆ON)⁺ 基团更接近平面排列，表现出强烈的结构各向异性，有利于大的双折射。

正如预期的那样，(C₅H₆ON)₂[Sb₂O(C₂O₄)₃]在546nm处表现出0.279的大双折射。结构和理论分析表明，多个π-共轭单元的组合是设计和探索新型优良双折射材料的可行方法。

附：英文原文

Title: Layered (C5H6ON)2[Sb2O(C2O4)3] with a large birefringence derived from the uniform arrangement of π-conjugated units

Author:Dong-Xue Jiao, Hui-Li Zhang , Chao He, Si-Yu Chen, Ke Wang, Xiao-Han Zhang, Li Wei, Qi Wei

Issue&Volume: 2024-04-15

Abstract: An organic-inorganic hybrid antimony(III) oxalate (C5H6ON)2[Sb2O(C2O4)3] was successfully obtained by simultaneous combination of π-conjugated 4-hydroxypyridine and (C2O4)2- group with stereochemical active Sb(III) cation. The compound features a layered structure, and the equatorial planes of SbO6 units, the π-conjugated (C2O4)2- and (C5H6ON)+ groups are closer to planar arrangement, represent strong structural anisotropy that favors a large birefringence. As expected, (C5H6ON)2[Sb2O(C2O4)3] exhibits a large birefringence of 0.279 at 546 nm. Structural and theoretical analyses indicate that the combination of multiple π-conjugated units is a feasible approach for designing and exploring new superior birefringent materials.

DOI: 10.1016/j.cjsc.2024.100304

Source: http://cjsc.ac.cn/cms/issues/605