Received 3 August 2013
aHanoi University of Mining and Geology, Dong Ngac, Tu Liem, Ha Noi, Vietnam,bPeoples' Friendship University of Russia, 6, Miklukho-Mallaya, 117198 Moscow, Russian Federation, and cKarpov Institute of Physical Chemistry, 10, Vorontsovo Pole, 105064 Moscow, Russian Federation
Correspondence e-mail: firstname.lastname@example.org
In the title compound, [Ba(C7H5N2O5)2(H2O)6]·4H2O, the Ba2+ cation lies on a twofold rotation axis and is ten-coordinated by two 3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanide oxo O atoms [Ba-O = 2.8715 (17) Å], two hydroxyimino N atoms [Ba-N = 3.036 (2) Å], and six water molecules [Ba-O = 2.847 (2), 2.848 (2), and 2.880 (2) Å]. The 3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanide monoanions act in a bidentate chelating manner, coordinating through an N atom of the non-deprotonated hydroxyimino group and an O atom of the neighboring oxo group. Two lattice water molecules are located in the cavities of the framework and are involved in hydrogen bonding to O atoms of one of the coordinating water molecules and the O atom of a keto group of the ligand. As a result, a three-dimensional network is formed.
For the synthesis and crystal structure of sodium 3,5-bis(hydroxyimino)-1-methyl-2,4,6- trioxocyclohexanide, see: Kovalchukova et al. (2012). For related structures of metal complexes with 1,2-benzo(naphto)quinone-1-oximes, see: Chakravorty (1974); Charalambous et al. (1993, 1995, 1996); Adatia et al. (1996); Basu & Chakravorty (1992); McPartlin (1973); Djinovic et al. (1992); Liu et al. (2010). For applications of related complexes as catalysts, see: Gharah et al. (2009).
Data collection: CAD-4-PC (Enraf-Nonius, 1993); cell refinement: CAD-4-PC; data reduction: CAD-4-PC; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: CIFTAB97 (Sheldrick, 2008) and SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BV2225 ).
This research was supported by the Russian Foundation for Basic Research (grant 13-03-00079).
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