Syntheses and characterization of two copper pyridine-dicarboxylate compounds containing water clusters

Okan Zafer Yeşilel, Nci Lker, Moamen S. Refat, Hiroyuki Ishida

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A new homonuclear and heterodinuclear pyridine-2,6-dicarboxylate complexes, formulated as (enH2)[Cu(dipic)2]·2.5H2O (1) and [Cu(μ-dipic)2Zn(H2O)5] ·2H2O (2) (en = ethylenediamine, dipic = pyridine-2,6- dicarboxylate) were synthesized according the reactions between the three species of copper(II) and zinc(II) nitrate, ethylenediamine and pyridine-2,6-dicarboxylic acid. Complexes have been characterized by the methods of elemental, spectroscopic (IR and UV-Vis), thermal (TG/DTG, DTA) analysis, magnetic measurement and single crystal X-ray diffraction. Correlation coefficient, activation energies, E; pre-exponential factor, A; entropies, S; enthalpies, H and Gibbs free energies, G of the thermal decomposition reactions have been calculated under the derivations from thermogravimetric (TG) and differential thermogravimetric (DTG) curves, using the Coats-Redfern and Horowitz-Metzger methods. Complex 1 belonged to a six-coordinate behavior with a distorted octahedral geometry around Cu(II), that the structure contains two pyridine-2,6-dicarboxylate species as a tridentate ligands and ethylenediaminium cation as a counter ion as well as 2.5 uncoordinated water molecules. On the other hand complex 2 contains six-coordinated Cu(II) and Zn(II) ions, which are linked by two O atoms of the same carboxyl group from dipicolinic acid. The dipicolinate dianions again behave as tridentate ligands in 2. Two uncoordinated water molecules are also present in the structure. The structure units of 1 and 2 are mutually held by the hydrogen bonds and π⋯π interactions. There is also a C-O⋯π interaction in 2. The Cu(II) complexes are connected to one another via O-H⋯O hydrogen bonds, forming water clusters, which play an important role in the stabilization of the crystal structure. In the water clusters, the water molecules are trapped by the cooperative association of coordination interactions as well as hydrogen bonds.

Original languageEnglish
Pages (from-to)2345-2351
Number of pages7
JournalPolyhedron
Volume29
Issue number11
Publication statusPublished - Jul 28 2010

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ethylenediamine
Pyridine
Copper
pyridines
copper
Water
synthesis
Hydrogen bonds
water
hydrogen bonds
Molecules
Ligands
molecules
ligands
Radiation counters
Acids
dicarboxylic acids
Magnetic variables measurement
carboxyl group
interactions

Keywords

  • C-O⋯π interaction
  • Heterodinuclear complex
  • Pyridine-2,6-dicarboxylate complexes
  • Pyridine-2,6-dicarboxylic acid
  • Water cluster

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Materials Chemistry
  • Physical and Theoretical Chemistry

Cite this

Syntheses and characterization of two copper pyridine-dicarboxylate compounds containing water clusters. / Yeşilel, Okan Zafer; Lker, Nci; Refat, Moamen S.; Ishida, Hiroyuki.

In: Polyhedron, Vol. 29, No. 11, 28.07.2010, p. 2345-2351.

Research output: Contribution to journalArticle

Yeşilel, Okan Zafer ; Lker, Nci ; Refat, Moamen S. ; Ishida, Hiroyuki. / Syntheses and characterization of two copper pyridine-dicarboxylate compounds containing water clusters. In: Polyhedron. 2010 ; Vol. 29, No. 11. pp. 2345-2351.
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N2 - A new homonuclear and heterodinuclear pyridine-2,6-dicarboxylate complexes, formulated as (enH2)[Cu(dipic)2]·2.5H2O (1) and [Cu(μ-dipic)2Zn(H2O)5] ·2H2O (2) (en = ethylenediamine, dipic = pyridine-2,6- dicarboxylate) were synthesized according the reactions between the three species of copper(II) and zinc(II) nitrate, ethylenediamine and pyridine-2,6-dicarboxylic acid. Complexes have been characterized by the methods of elemental, spectroscopic (IR and UV-Vis), thermal (TG/DTG, DTA) analysis, magnetic measurement and single crystal X-ray diffraction. Correlation coefficient, activation energies, E; pre-exponential factor, A; entropies, S; enthalpies, H and Gibbs free energies, G of the thermal decomposition reactions have been calculated under the derivations from thermogravimetric (TG) and differential thermogravimetric (DTG) curves, using the Coats-Redfern and Horowitz-Metzger methods. Complex 1 belonged to a six-coordinate behavior with a distorted octahedral geometry around Cu(II), that the structure contains two pyridine-2,6-dicarboxylate species as a tridentate ligands and ethylenediaminium cation as a counter ion as well as 2.5 uncoordinated water molecules. On the other hand complex 2 contains six-coordinated Cu(II) and Zn(II) ions, which are linked by two O atoms of the same carboxyl group from dipicolinic acid. The dipicolinate dianions again behave as tridentate ligands in 2. Two uncoordinated water molecules are also present in the structure. The structure units of 1 and 2 are mutually held by the hydrogen bonds and π⋯π interactions. There is also a C-O⋯π interaction in 2. The Cu(II) complexes are connected to one another via O-H⋯O hydrogen bonds, forming water clusters, which play an important role in the stabilization of the crystal structure. In the water clusters, the water molecules are trapped by the cooperative association of coordination interactions as well as hydrogen bonds.

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