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Crystal structures of sodium magnesium selenate decahydrate, Na 2 Mg(SeO 4 ) 2 ·10H 2 O, a new selenate salt, and sodium magnesium selenate dihydrate, Na 2 Mg(SeO 4 ) 2 ·2H 2 O
Author(s) -
Kamburov Stoyan,
Schmidt Horst,
Voigt Wolfgang,
Balarew Christo
Publication year - 2017
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229617009330
Subject(s) - selenate , sodium selenate , magnesium , octahedron , chemistry , inorganic chemistry , sodium , selenium , crystallography , crystal structure , organic chemistry
Metal selenates crystallize in many instances in isomorphic structures of the corresponding sulfates. Sodium magnesium selenate decahydrate, Na 2 Mg(SeO 4 ) 2 ·10H 2 O, and sodium magnesium selenate dihydrate, Na 2 Mg(SeO 4 ) 2 ·2H 2 O, were synthesized by preparing solutions of Na 2 SeO 4 and MgSeO 4 ·6H 2 O with different molar ratios. The structures contain different Mg octahedra, i.e. [Mg(H 2 O) 6 ] octahedra in the decahydrate and [MgO 4 (H 2 O) 2 ] octahedra in the dihydrate. The sodium polyhedra are also different, i.e. [NaO 2 (H 2 O) 4 ] in the decahydrate and [NaO 6 (H 2 O)] in the dihydrate. The selenate tetrahedra are connected with the chains of Na polyhedra in the two structures. O—H…O hydrogen bonding is observed in both structures between the coordinating water molecules and selenate O atoms.