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Na 8 [Cr 4 B 12 P 8 O 44 (OH) 4 ][P 2 O 7 ]⋅ n H 2 O: A 3D Borophosphate Framework with Spherical Cages
Author(s) -
Yang Tao,
Sun Junliang,
Li Guobao,
Eriksson Lars,
Zou Xiaodong,
Liao Fuhui,
Lin Jianhua
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200800789
Subject(s) - crystallography , ring (chemistry) , boron , cluster (spacecraft) , hydrothermal circulation , chemistry , ion , unit (ring theory) , molecule , hydrothermal synthesis , chromium , center (category theory) , combinatorics , physics , mathematics , geology , computer science , mathematics education , organic chemistry , seismology , programming language
A chromium borophosphate–phosphate (Na 8 [Cr 4 B 12 P 8 O 44 (OH) 4 ][P 2 O 7 ] ⋅ n H 2 O, 1 ), which has an unusual 3D framework structure, was synthesized under hydrothermal conditions. The framework consists of spherical cages composed of CrO 6 , PO 4 , BO 4 , and BO 3 polyhedra. The cages are located at the vertices and the body center of the cubic cell and are interconnected through 12‐membered‐ring windows along the {111} direction. The actual framework structure is very complex, but the description can be simplified by using the 5‐connected fundamental building cluster [CrP 5 B 3 O 24 ] 11− . In addition, 1 represents the first borate‐rich borophosphate that contains a 3D borophosphate partial framework ( ${{{\hfill 3\atop \hfill \infty }}}$ [B 3 P 2 O 11 (OH)]) in which the fundamental building unit is an oB dreier single ring (Δ4□:□<Δ2□>□). The cavities of the framework are filled with disengaged water molecules and Na + counterions. The former can be reversibly desorbed and reabsorbed and the latter can be exchanged by Li + ions, which results in significant shrinkages of the cell volume.