中国科学院福建物质结构研究所叶宁团队合成了KBe2BO3F2族中第一个具有很强的二次谐波响应的负离子混合范德华成员，Be2(BO3)(IO3)。相关研究成果发表在2021年5月26日出版的《德国应用化学》。

获得具有大二次谐波效应的非线性光学材料一直是一个巨大的挑战。

该文通过对保持KBe2BO3F2(KBBF)结构特征的KBBF进行巧妙的多组分改性，并将(IO3)- 基团连接到蜂窝状 [Be2BO3O2] ∞ 上，合成了第一种金属硼酸盐碘酸盐NLO晶体Be2(BO3)(IO3) (BBIO)。得益于(IO 3  ) -  , (BO 3  ) 3- 和 (BeO 4  ) 6- 基团的协同作用，BBIO是KBBF家族中第一个混合阴离子的成员，表现出很强的SHG响应（约为7.2 × KH 2  PO 4  (KDP, @1064 nm)）和大的双折射(Δn）(在1064nm处为0.172)。此外，BBIO意外地显示出通过范德华力优化生长习性的潜在能力。

该研究不仅表明碘酸硼是一种新型的NLO材料，而且为KBBF结构工程提供了巨大的发展机遇。

附：英文原文

Title: Be2(BO3)(IO3): The First Anion-mixed Van der Waals Member in KBe2BO3F2 Family with Very Strong Second Harmonic Generation Response

Author: Guang Peng, Chensheng Lin, Huixin Fan, Kaichuang Chen, Bingxuan Li, Ge Zhang, Ning Ye

Issue&Volume: 2021-05-26

Abstract: To obtain new nonlinear optical (NLO) materials with a large second harmonic generation (SHG) effect has always been a great challenge. Herein, the first metal borate-iodate NLO crystal, Be 2  (BO 3  )(IO 3  ) (BBIO), was synthesized by ingenious multi-component modification of KBe 2  BO 3  F 2  (KBBF), in which the structural features of KBBF was maintained and (IO 3  ) -  groups were connected to honeycomb [Be 2  BO 3  O 2  ] ∞  layers. As the first KBBF family member with mixed anionic groups, BBIO benefited from the synergistic effect of (IO 3  ) -  , (BO 3  ) 3-  and (BeO 4  ) 6-  groups, and exhibited a very strong SHG response of ~7.2 × KH 2  PO 4  (KDP, @1064 nm) and a large birefringence (Δn) of 0.172 at 1064 nm. Besides, BBIO unexpectedly showed the potential ability to optimize growth habits via  van der Waals force. This study not only showed borate-iodate as a new excellent NLO material, but also provided enormous opportunities in KBBF structural engineering.

DOI: 10.1002/anie.202105777

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202105777