Two Metal Complexes Based on the Ligand 3, 4‐Pyrazoledicarboxylic Acid: Synthesis, Structures, and Luminescent Properties
Linti Chen, F. Tao, Lidong Wang
Mar 1, 2013
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12
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Journal
Zeitschrift für anorganische und allgemeine Chemie
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Key Takeaway Key Takeaway: Two metal complexes based on 3, 4-pyrazoledicarboxylic acid show promising thermal and photoluminescent properties in the solid state.
Abstract
Two new metal complexes, {[Cd2(μ2-H2pdc)2(H2O)8]·[Cd2(H2pdc)4(H2O)2(μ2-Cl)2]}·2H2O (1), and [Ba2(H2pdc)4(H2O)8]·2H2O (2) (H3pdc = 3, 4-pyrazoledicarboxylic acid), were synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. The crystal structures show that compound 1 is an independent unit consisting of two discrete dinuclear complex ions [Cd2(μ2-H2pdc)2(H2O)8]2+ cation and [Cd2(H2pdc)4(H2O)2(μ2-Cl)2]2– anion, and the two kinds of ions are linked by hydrogen bonds and electrostatic interactions to generate a 3D supramolecular network. Complex 2 is a common dinuclear structure, which is further assembled to a 3D supramolecular network through intermolecular hydrogen bonds and π–π stacks. The hydrogen bonding interactions involving lattice water or coordinated water molecules all exist in complexes 1 and 2. Notably, three coordination modes of 3, 4-pyrazoledicarboxylic acid were observed. The thermal and photoluminescent properties of complexes 1 and 2 in the solid state were also investigated.