期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 14, 页码 6472-6476出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c00060
关键词
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资金
- NSFC [21833010, 21525104, 61975207, 21971238, 21921001, 51872297, 51890864]
- Youth Innovation Promotion of CAS [2016274]
- Fujian Institute of Innovation in CAS [FJCXY18010201]
- Key Research Program of Frontier Sciences of CAS [ZDBS-LY-SLH024]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000, XDB20010200]
Structures composed of SiOxF6-x (x = 1, 2, 3, 4, 5) or SiOxF4-x (x = 1, 2, 3) species have thus far been observed in only a few compounds, and their functional properties are completely unknown in silicate chemistry. By introducing the least electronegative element, cesium, and the most electronegative element, fluorine, into the silicophosphate system, we successfully designed the first noncentrosymmetric fluorooxosilicophosphate with Si-F bonds, CsSiP2O7F, whose structure consists of an unprecedented SiP2O10F moiety containing hexacoordinate SiO5F species. The experimental results highlight CsSiP2O7F as the first fluorooxosilicophosphate deep-UV nonlinear optical (NLO) material. The first-principles calculations reveal that the SiP2O10F moiety is a new type of NLO-active unit and that both cesium and fluorine increase the deep-UV transparency of CsSiP2O7F. This work provides a new source of deep-UV NLO materials and insights into obtaining noncentrosymmetric structures that are indispensable to functional materials in nonlinear optics, piezoelectricity, ferroelectric, pyroelectricity, etc.
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