Syntheses, crystal structures and characterization of three alkaline metal borates
Sambasivam, S (Sambasivam, Sangaraju); Liu, LL (Liu, Lili); Yang, Y (Yang, Yun); Han, GP (Han, Guopeng); Bashir, B (Bashir, Beenish); Yang, ZH (Yang, Zhihua); Pan, SL (Pan, Shilie)
2017
Source PublicationCRYSTENGCOMM
ISSN1466-8033
Volume19Issue:18Pages:2561-2569
Abstract

Three alkaline metal borates Cs2B7O9(OH)(5), K2B4O5(OH)(4).H2O, and K2B4O5(OH)(4).3.6H(2)O have been synthesized by a hydrothermal method. They were structurally characterized by single crystal X-ray diffraction. In the three compounds, the B-O anionic groups are all isolated, which are combined through the Cs/K-O polyhedra to form a three-dimensional (3D) network. The cationic framework presents different dimensions in Cs2B7O9(OH)(5), K2B4O5(OH)(4).H2O and K2B4O5(OH)(4).3.6H(2)O. For Cs2B7O9(OH)(5), which has been reported before, we obtained its large-scale crystal and the UV-vis diffuse reflectance spectral data of Cs2B7O9(OH)(5) indicate that it has a UV cut-off edge of 209 nm which corresponds to an energy gap of 5.93 eV. Theoretical calculations were carried out to evaluate the band gaps of the title compounds, which illuminate that the replacement of K enlarges the band gap. Besides, the structural discrepancy among Cs2B7O9(OH)(5), K2B4O5(OH)(4).H2O and K2B4O5(OH)(4).3.6H(2)O is compared to analyze the effect of the cation number on the polymerization degree of the B-O anionic groups. Density functional theory calculations were employed to evaluate the band structures and the density of states suggest that Cs2B7O9(OH)(5) and K2B4O5(OH)(4).H2O possess wide band gaps of 5.23 and 5.24 eV, respectively. Meanwhile, the large-scale crystal of Cs2B7O9(OH)(5) was obtained.

DOI10.1039/c7ce00450h
Indexed BySCI
WOS IDWOS:000401015000015
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Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/4790
Collection中国科学院特殊环境功能材料与器件重点试验室
材料物理与化学研究室
Corresponding AuthorYang, ZH (Yang, Zhihua); Pan, SL (Pan, Shilie)
Affiliation1.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Xinjiang Key Lab Elect Informat Mat & Devices, Key Lab Funct Mat & Devices Special Environm, 40-1 South Beijing Rd, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Sambasivam, S ,Liu, LL ,Yang, Y ,et al. Syntheses, crystal structures and characterization of three alkaline metal borates[J]. CRYSTENGCOMM,2017,19(18):2561-2569.
APA Sambasivam, S .,Liu, LL .,Yang, Y .,Han, GP .,Bashir, B .,...&Pan, SL .(2017).Syntheses, crystal structures and characterization of three alkaline metal borates.CRYSTENGCOMM,19(18),2561-2569.
MLA Sambasivam, S ,et al."Syntheses, crystal structures and characterization of three alkaline metal borates".CRYSTENGCOMM 19.18(2017):2561-2569.
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