REI5O14 (RE=Y and Gd): Promising SHG Materials Featuring the Semicircle-Shaped I5O143- Polyiodate Anion
REI5O14 (RE=Y and Gd): Promising SHG Materials Featuring the Semicircle-Shaped I5O143- Polyiodate Anion
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DOI：
10.1002/anie.201904383
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发表时间：
2019-07-12
影响因子：
16.6
通讯作者：
Mao, Jiang-Gao
中科院分区：
文献类型：
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作者：
Chen, Jin;Hu, Chun-Li;Mao, Jiang-Gao
第一批稀土多碘酸盐，即REI5O14 (RE=Y和Gd)，是由RE2O3和H5IO6在H3PO4 （>= 85 wt %, H2O）中水热反应制备的，收率极高（> 95%）。它们在极空间群Cm中结晶，形成一个全新的半圆形[I5O14]（3-）五聚多元碘酸盐阴离子，由两个IO3和三个IO4多面体组成。值得注意的是，这两种化合物在1064 nm激光辐射下，Y和Gd化合物分别表现出14x和15xKH(2)PO(4) （KDP）的大二次谐波产生（SHG）信号。我们的研究表明，在磷酸介质中的水热反应有利于稀土多碘酸盐的形成。
The first examples of rare-earth polyiodates, namely, REI5O14 (RE=Y and Gd), have been prepared by hydrothermal reactions of RE2O3 and H5IO6 in H3PO4 (>= 85 wt % in H2O), with extremely high yields (>95 %). They crystalize in the polar space group Cm and feature a brand-new semicircle-shaped [I5O14](3-) pentameric polyiodate anion composed of two IO3 and three IO4 polyhedra. Remarkably, both compounds exhibit very large second-harmonic generation (SHG) signals (14x and 15xKH(2)PO(4) (KDP) upon 1064 nm laser radiation for Y and Gd compounds, respectively). Our work shows that the hydrothermal reaction in a phosphoric acid medium facilitates the formation of rare-earth polyiodates.