Premium
PKU‐5: An Aluminoborate with Novel Octahedral Framework Topology
Author(s) -
Ju Jing,
Yang Tao,
Li Guobao,
Liao Fuhui,
Wang Yingxia,
You Liping,
Lin Jianhua
Publication year - 2004
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.200400066
Subject(s) - octahedron , topology (electrical circuits) , computer science , materials science , crystallography , chemistry , mathematics , combinatorics , crystal structure
Abstract A new anhydrous aluminoborate Al 4 B 6 O 15 (PKU‐5) has been synthesized in a boric acid flux in a closed system at 350 °C. PKU‐5, which crystallizes in the space group R 3 with the lattice constants a =11.43398(9) and c =6.48307(5) Å, consists of Al octahedra and triangularly coordinated boron. The Al octahedron adopts the (10,3)‐a network, in which each octahedron shares three edges with the neighboring octahedra forming ten‐membered‐ring channels. The octahedral backbone in PKU‐5 can be considered as a primary octahedral framework topology and, setting out from the structures of the aluminoborates (PKU‐1 and PKU‐5), we propose construction rules for the octahedral frameworks. There are two types of connections for edge‐sharing octahedra in porous frameworks, trans and cis type, by which various microporous octahedral frameworks of different topologies can be constructed. The borate groups share oxygens with the Al octahedral frameworks forming two kinds of three‐membered‐ring units consisting of two octahedra and one triangle (2Al+B) and one octahedron and two triangles (Al+2B), respectively.