A new nickel(II) complex with two imidazole-4-acetate (ima) and a 1,10-phenanthroline (phen) was synthesized and characterized. The monomeric units are assembled by two NH center dot center dot center dot O-C intermolecular hydrogen bonds and pi-pi interactions, yielding two-dimensional layers. This complex includes six-water molecules per a nickel atom between the layers. The assembled interlayered host framework reversibly releases and reincludes water molecules.