Acta Cryst. (2008). E64, m586-m587  [ doi:10.1107/S1600536808008015 ]

Poly[tris{₂-4-[4-(dimethylamino)phenyldiazenyl]benzenesulfonato}tridioxanetrisodium(I)]

K. Sato, H. Shibata and J. Mizuguchi

Abstract: The title compound, [Na₃(C₁₄H₁₄N₃O₃S)₃(C₄H₈O₂)₃]_n, is a polynuclear complex which includes, in the monomeric unit, three units of Na^I-4'-dimethylaminoazobenzene-4-sulfonate [known as methyl orange (MO)] and three molecules of dioxane (C₄H₈O₂). These constitute three kinds of Na^I centres, two of which are seven-coordinate while the third is five-coordinate. One of the seven-coordinate centres is coordinated by six O atoms from the sulfonate groups of four different MOs and by one O atom from dioxane. The other is coordinated by seven O atoms from the sulfonate groups of five different MOs. The five-coordinate centre is coordinated by three O atoms from the sulfonate groups of three different MOs and two O atoms from two different dioxanes. In the crystal structure, a one-dimensional polymer chain is formed along the a axis and this ensures the thermal stability of the title compound. It is also to be noted that the N=N bond lengths of the three azo groups are appreciably different [1.259 (4), 1.196 (4), and 1.253 (4) Å].

Online 29 March 2008

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