Li Xingqi, Chu Dongdong, Qiu Haotian, Wu Yabo, Hou Xueling
Research Center for Crystal Materials; CAS Key Laboratory of Functional Materials and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry, CAS, 40-1 South Beijing Road, Urumqi 830011, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Dalton Trans. 2023 Mar 28;52(13):3942-3946. doi: 10.1039/d3dt00401e.
Borate has become a hot topic because of its rich structural chemistry and excellent properties for functional materials fields. The rearrangement of π-conjugated B-O units is key to enhancing the optical anisotropy, but it remains a challenge. Herein, by introducing [AlO] tetrahedra, a new congruent melting aluminoborate LiCsAlBO with [BO] clusters was discovered. This work confirms that the introduction of [AlO] tetrahedra can lead to the rearrangement of anionic framework of the borate system and thereby enhance the birefringence of LiCsAlBO. The birefringence is about 4.1 times higher than that of its congener LiCsBO with the same [BO] clusters. Similarly, the effects of [AlO] tetrahedra on the rearrangement of the B-O anionic framework are also demonstrated in other known borates.
硼酸盐因其丰富的结构化学和在功能材料领域的优异性能而成为一个热门话题。π共轭B-O单元的重排是增强光学各向异性的关键，但这仍然是一个挑战。在此，通过引入[AlO]四面体，发现了一种具有[BO]簇的新型同成分熔化铝硼酸盐LiCsAlBO。这项工作证实，[AlO]四面体的引入可导致硼酸盐体系阴离子骨架的重排，从而提高LiCsAlBO的双折射。其双折射比具有相同[BO]簇的同类物LiCsBO高约4.1倍。同样，[AlO]四面体对B-O阴离子骨架重排的影响也在其他已知硼酸盐中得到了证明。
