Hydrogen-bonded assemblies of trinuclear metal string complexes

Three kinds of trinuclear metal string complexes, [Ni-3(dpa)(4)(L-1)(2)]center dot H2O center dot C2H5OH (L-1 = (E)-3-(2-hydroxyl-phenyl)- acrylic acid) (1), [Ni-3(dpa)(4)(L-2)(2)]center dot 2C(2)H(5)OC(2)H(5) (L-2 =(E)-3-(3-hydroxyl-phenyl)- acrylic acid) (2) mid [Ni-3(dpa)(4)(L-2)(2)]center dot 3CH(2)Cl(2)center dot 1.5CH(3)OH (L-3 =(E)-3-(4-hydroxyl-phenyl)-acrylic acid) (3). (dpa(-) = bis(2-pyridyl)amido), have been synthesized. The structures of 1 and 2 have been analyzed by the X-ray single-crystal diffraction showing hydrogen-bonded networks.