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The extended conjugation of the phenoxide O atom in the title compound, K+.C7H3N2O6-.2H2O, gives the ring a slight quinonoid character. The substituents deviate significantely from the plane of the ring, the largest deviations being those of the formyl, 2-nitro and 4-nitro groups, which are twisted by 81 (1), 45.06 (15) and 9.08 (12)°, respectively. The structure consists of infinite chains running along the c axis. These chains are stacked perpendicular to the shortest axis (a) on two alternating layers related by the 21 screw axis. The cation is coordinated by six O atoms at distances of 2.750 (2)-2.972 (2) Å. The phenoxide O atom does not belong to the first coordination shell; it is an acceptor from the water molecules in a three-dimensional network of hydrogen bonds.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks nacs, global

hkl

Structure factor file (CIF format)
Contains datablock nacs

CCDC reference: 129996

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