catena-poly[[[aqua(1,10-phenanthroline-κ2N,N′)sodium(I)]-μ-aqua-[diaqua(1,10-phenanthroline-κ2N,N′)sodium(I)]-μ-aqua] dibromide 1,10-phenanthroline solvate]

In the title compound, {[Na-2(C12H8N2)(2)(H2O)(5)]Br-2 center dot C12H8N2}(n), the Na-I ions in polymeric chains adopt two different types of coordination geometry. In one type, the Na-I ion is coordinated by two N atoms from 1,10-phenanthroline (L) and four water molecules in a distorted octahedral geometry, while in the other type, the Na-I ion is coordinated by two N atoms from L and three water molecules in a distorted trigonal-bipyramidal geometry. The coordinating bond lengths Na-N [2.425(5)-2.517(5) angstrom] and Na-O [2.353(5)-2.574(4) angstrom] are normal. The crystal packing exhibits an extensive hydrogen-bonding network (O-H center dot center dot center dot N,O-H center dot center dot center dot O andO-H center dot center dot center dot Br) and pi-pi interactions (centroid-centroid distances are 3.821 and 3.896 angstrom).