Hydrogen-bonding assemblies constructed from metalloligand building blocks and H2O

New hydrogen-bonding assemblies were synthesized from the reaction of a metalloligand, [Cu(2,4-pydca)2]2− (LCu) (2,4-pydca = 2,4-pyridinedicarboxylate), with a FeII ion or an imidazole in an aqueous medium and crystallographically characterized. The obtained compounds, [Fe(H2O)6][Cu(2,4-pydca)2] (1) and [Cu(2,4-pydca)(imidazole)2] · 2H2O (2), have metalloligand dimer units, [Cu2(2,4-pydca)4]4− and [Cu2(2,4-pydca)2(imidazole)4], respectively, each of which assembles by π–π (1) and hydrogen-bonding (2) interactions to form 1-D metalloligand arrays. The 1-D metalloligand arrays are linked by rich hydrogen-bonding interactions via H2O molecules.