Abstract
A new heterometallic supramolecular coordination polymer, namely [(1-mimH)[Nd(pydc)3Ca(pydcH2)(H2O)2]·4H2O] n (where pydcH2 = pyridine-2,6-dicarboxylic acid (dipicolinic acid), 1-mim = 1-methylimidazole) has been prepared and characterized by elemental analysis, spectral (IR, UV–Vis), 1H NMR and 13C NMR spectroscopy, thermal analysis as well as single-crystal X-ray diffraction. The X-ray diffraction study demonstrates that the compound has a 1D network; the layers of this compound are connected by complicated hydrogen bonds to form 3D supramolecular architecture. The polymeric chain contains Nd(III) ions and Ca(II) ions bridged by (pydc)2− ligands. Each (pydc)2− ion is connected to one neodymium(III) ion as a tridentate ligand and one calcium ion via bridging carboxylate group. The equilibrium constants of dipicolinic acid and 1-methylimidazole, pydc/1-mim proton transfer system, as well as those of the complexes (binary, ternary, and quaternary) were investigated by potentiometric pH titration method.
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Ghadermazi, M., Derikvand, Z., Zahedi, A. et al. A new neodymium(III)–calcium(II) one-dimensional coordination polymer constructed from dipicolinic acid: synthesis, crystal structure, spectroscopic and thermal analysis, and solution studies. Monatsh Chem 146, 1257–1266 (2015). https://doi.org/10.1007/s00706-014-1377-4
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DOI: https://doi.org/10.1007/s00706-014-1377-4