title: Crystal structure of [Al4(OH)6(H2O)12][Al(H2O)6]2Br12: a new polyaluminum compound.
abstract: A vertex-shared tetrahedral [Al(4)(OH)(6)(H(2)O)(12)](6+) (Al(4)) and a disordered [Al(H(2)O)(6)](3+) (Al(1)) that coexist in a 1:2 ratio within each unit cell were observed in the structure of [Al(4)(OH)(6)(H(2)O)(12)][Al(H(2)O)(6)](2)Br(12), which crystallized in a cubic Fd3m space group from a spontaneously hydrolyzed solution of AlBr(3). The former is composed of four AlO(6) octahedra that are connected to each other by sharing three vertexes of each octahedron and form a large regular tetrahedron with ideal T(d) symmetry. The central Al(3+) ion of the latter is coordinated by 6 disordered OH(2) molecules, that form a core-shell structure with ideal D(3d) symmetry.
authors: College of Chemistry and Chemical Engineering, Inner Mongolia University, 235 West University Road, Hohhot 010021, China.
authors: Zhong
authors: Z
authors: Sun
authors: Hui
authors: H
authors: Wang
authors: Huijun
authors: H
authors: Feng
authors: Ying
authors: Y
authors: Zhang
authors: Shuangyan
authors: S
authors: Du
mesh_terms: D017607:Aluminum Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D008958:Models, Molecular
chemical_list: D017607:Aluminum Compounds