A hydrogen-bonded 3D coordination network of Cu-II nitrate with pyridine-2,6-dicarboxylic acid and 3-(2-pyridyl)pyrazole: hydrothermal synthesis, characterization and crystal structure

作者：Zou RQ; Bu XH^*; Du M; Sui YX

来源：Journal of Molecular Structure, 2004, 707(1-3): 11-15.

DOI：10.1016/j.molstruc.2004.05.001

• hydrothermal synthesis
• copper(II) complex
• pyridine-2-6-dicarboxylic acid
• 3-(2-pyfidyl)pyrazole
• crystal structure

A pentacoordinate monomeric Cull complex, [Cu(H2O)(HL1)(L-2)](NO3)(H2O) (1), with the mixed ligands (where H2L1 = pyridine-2,6-dicarboxylic acid and L-2 = 3-(2-pyridyl)pyrazole), has been synthesized and characterized by elemental analyses, IR, thermogravimetric analysis and X-ray diffraction techniques. X-ray structural analysis of complex 1 revealed that the Cu-II center has a CuN3O2 distorted square pyramid environment with three N atoms of two different ligands and an O atom of coordinated water molecule constituting the mean plane, and one O atom of ligand HL1 occupying the axial site. The H2L1 ligand is mono-deprotonated in this structure, and only one oxygen atom of the carboxylate group coordinates to the Cu-II center. A striking structural feature of complex 1 is the three-dimensional supramolecular architecture formed through intermolecular C-H...O, O-H...O and N-H...O hydrogen-bonding interactions. The IR and ESR spectra, and thermogravimetfic analysis of complex 1 have been further investigated.

• 出版日期2004-11-22
• 单位南京大学; 南开大学