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Synthesis and crystal structure of hexaaquamagnesium hydrogen phosphododecatungstate tetrahydrate [Mg(H 2 O) 6 ][HPW 12 O 40 ]·4H 2 O
Author(s) -
Kremenović A.,
Poleti D.,
Ghermani N. E.,
Karanović L.,
Mioč U. B.,
Nedić Z.,
Spasojevićde Biré A.
Publication year - 2007
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200610778
Subject(s) - chemistry , molecule , tetrahydrate , crystal structure , crystallography , hydrogen bond , aqueous solution , ion , inorganic chemistry , organic chemistry
Crystals suitable for X‐ray structure analysis were obtained after the slow evaporation of the reaction mixture containing equimolar quantities of magnesium chloride and dodecatungstophosphoric acid aqueous solution insuring pH of the solution between 1.0 and 1.2. This simple synthetic route yielded stability of Keggin anion and high quality [Mg(H 2 O) 6 ][HPW 12 O 40 ]·4H 2 O single crystals. The obtained compound belongs to the group of heteropoly compounds and its structure is composed of Keggin [PW 12 O 40 ] 3– anions, [Mg(H 2 O) 6 ] 2+ cations and lattice water molecules. Zigzag arrangement of Keggin anions along c ‐axis creates irregular channels occupied by [Mg(H 2 O) 6 ] 2+ cations and lattice H 2 O molecules. The calculation of the total potential solvent volume indicated the presence of 4.1 lattice H 2 O lattice molecules per formula unit, which is in agreement with the here presented structural model. The position of one lattice water molecule is well defined, while each of three other molecules is statistically distributed over two locations. Hydrogen bonds involve all coordinated and lattice H 2 O molecules, as well as some oxygen atoms from the Keggin anion. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)