title: A giant polyaluminum species S-Al32 and two aluminum polyoxocations involving coordination by sulfate ions S-Al32 and S-K-Al13.
abstract: The giant polyaluminum species [Al32O8(OH)60(H2O)28(SO4)2](16+) (S-Al32) and [Al13O4(OH)25(H2O)10(SO4)](4+) (S-K-Al13) [S means that sulfate ions take part in coordination of the aluminum polycation; K represents the Keggin structure] were obtained in the structures of [Al32O8(OH)60(H2O)28(SO4)2][SO4]7[Cl]2·30H2O and [Al13O4(OH)25(H2O)10(SO4)]4[SO4]8·20H2O, respectively. They are the first two aluminum polyoxocations coordinated by sulfate ions. The "core-shell" structure of S-Al32 is similar to that of Al30, but the units are linked by two [Al(OH)2(H2O)3(SO4)](-) groups with replacement of four η(1)-H2O molecules. The structure of S-K-Al13 is similar to the well-known structure of ε-K-Al13, but the units are linked by two (SO4(2-))0.5 with replacement of a H3O(+) ion. It was shown that strong interaction exists between the polyoxocations and counterions. On the basis of their structural features and preparation conditions, a formation and evolution mechanism (from ε-K-Al13 to S-K-Al13 and S-Al32) has been proposed. A local basification degree symmetrical equalization principle was extracted based on a comparison of the calculated results of the local basification degree for each central Al(3+) ion included in a polycation. They can be used to explain how the two aluminum species are formed and evolved and why the sulfate ions can coordinate to them and to predict where the OH-bridging positions will be upon further hydrolysis.
authors.affiliation: College of Chemistry and Chemical Engineering, Inner Mongolia University, 235 West University Road, Hohhot 010021, China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Sun
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Honggeer
authors.initials: H
authors.lastname: Tong
authors.forename: Shaofan
authors.initials: S
authors.lastname: Sun
mesh_terms: D017607:Aluminum Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007202:Indicators and Reagents; D008958:Models, Molecular; D008968:Molecular Conformation; D011108:Polymers / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D007202:Indicators and Reagents; D011108:Polymers; D013431:Sulfates