RE(SO4)[B(OH)4](H2O), RE(SO4)[B(OH)4](H2O)2, and RE(SO4)[B(OH)4](H2O)·H2O:
Rare-Earth Borate-Sulfates Featuring Three Types of Layered Structures
Posted on 2017-12-14 - 17:55
Using
hydrothermal reactions, three series of rare-earth borate-sulfates,
namely, RE(SO4)[B(OH)4](H2O) (RE = La (1), Sm (2), Eu (3)), RE(SO4)[B(OH)4](H2O)2 (RE = Pr (4), Nd (5), Sm (6), Eu (7), Gd (8)), and RE(SO4)[B(OH)4](H2O)·H2O (RE = Tb (9), Dy (10), Ho (11), Er (12), Tm (13), Yb (14), Lu (15), Y (16)), have been synthesized,
which represent the first rare-earth borate-sulfate mixed-anion compounds.
All these compounds possess the same fundamental building anionic
units of SO4 and B(OH)4 tetrahedra; however,
they exhibit three different types of two-dimensional (2D) layered
structures composed of 1D RE–B–O and RE–S–O chains. The rare-earth borate chains
are similar in all compounds, while the rare-earth sulfate chains
differ in each type of compound due to the various coordination modes
of sulfate groups. On the basis of the measured UV–vis diffuse
reflectance spectra, the optical band gaps of compounds 2, 3, 6, and 7 are estimated
to be 4.66, 4.53, 4.62, and 4.50 eV, respectively. Luminescence studies
show that compounds 2, 3, 6, and 7 exhibit strong emission in the orange or red
regions. Furthermore, thermal analysis and magnetic susceptibility
measurements for these four representative compounds have also been
performed.
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Wang, Wen-Wen; Xu, Xiang; Kong, Jin-Tao; Mao, Jiang-Gao (2017). RE(SO4)[B(OH)4](H2O), RE(SO4)[B(OH)4](H2O)2, and RE(SO4)[B(OH)4](H2O)·H2O:
Rare-Earth Borate-Sulfates Featuring Three Types of Layered Structures. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.7b02317
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