Synthesis and crystal structure of catena-poly[[[aqua-{2-[(E)-(1-cyano-2-imino-2-meth-oxy-ethyl-idene)hydrazin-yl]benzene-sulfonato}-sodium]-di-μ-aqua] dihydrate].

In the polymeric title compound, {[Na(C10H9N4O4S)(H2O)3]·2H2O} n , sixfold coordinated Na+ cations are linked into a chain parallel to [010] by sharing common water mol-ecules. Next to the four bridging water mol-ecules, each Na+ cation of the chain is bonded to the O atom of a terminal water mol-ecule and an O atom of the SO3 - group of the sulfonate anion. Classical O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonds and additional π-π inter-actions connect these chains into a three-dimensional network.