Constructions of a set of hydrogen-bonded supramolecules from reactions of transition metals with 3,5-dimethylpyrazole and different dicarboxylate ligands

Three new supramolecular coordination complexes [Zn(Hdmpz)(2)(O2C(CH2)(2)CO2)](n) (1), Ni-3(Hdmpz)(4)-(HOOC(CH2)(2)CO2)(2)(O2C(CH2)(2)CO2)(2)(CH3OH)(2) (2) and Co-3(Hdmpz)(2)(HOOC(CH2)(3)CO2)(2)(O2C(CH2)(3)CO2)(2)-(CH3OH)(4) (3) (Hdmpz = 3,5-dimethylpyrazol) have been synthesized and characterized by elemental analyses, IR spectra and single crystal X-ray diffraction analysis. Complex 1 is a polymer with the ZnO4N2 core that is interconnected by bridging succinate moieties into a 1D chain structure. Complexes 2 and 3 are discrete structures, both of them have two types of bridging-coordinated modes of carboxylate ligands (mu(3)-eta(2)-eta(2), mu(2)-eta(1)-eta(1)). And there are rich intra- or intermolecular hydrogen bonds in the crystals of 1-3, thereby forming a set of supramolecular frameworks. In addition, the thermal behaviors of 1-3 were also investigated. (C) 2008 Elsevier B.V. All rights reserved.