A Series of Enthalpy/Entropy-Driven Reversible Dissolution/Reorganization Equilibriums in the System of Cu(NO3)2–HL–GdX3–H2O (HL = 5-methylpyrazine-2-carboxylic acid; X = Cl, Br, NO3, ClO4)

Sheng Zhang; Qi Yang; Xiangyu Liu; Gang Xie; Qing Wei; Sanping Chen; Shengli Gao

doi:10.1071/CH13675

RESEARCH ARTICLE

Previous Next Contents Vol 67(11)

A Series of Enthalpy/Entropy-Driven Reversible Dissolution/Reorganization Equilibriums in the System of Cu(NO₃)₂–HL–GdX₃–H₂O (HL = 5-methylpyrazine-2-carboxylic acid; X = Cl, Br, NO₃, ClO₄)

Sheng Zhang ^A , Qi Yang ^A , Xiangyu Liu ^A , Gang Xie ^A , Qing Wei ^A , Sanping Chen ^A ^B and Shengli Gao ^A

+ Author Affiliations

- Author Affiliations

^A Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China.

^B Corresponding author. Email: sanpingchen@126.com

Australian Journal of Chemistry 67(11) 1679-1687 https://doi.org/10.1071/CH13675
Submitted: 10 December 2013 Accepted: 17 March 2014 Published: 15 April 2014

Abstract

Five coordination polymers, [Cu(L)₂]_n (1), {[Cu(L)(Cl)(H₂O)]·H₂O}₂_n (2), [KCu(L)(μ-Cl)₂]_n (3), [Cu(L)(Br)H₂O]_n (4), and {[Cu_0.5(HL)(H₂O)](NO₃)·H₂O}₂_n (5) (HL = 5-methylpyrazine-2-carboxylic acid) were obtained by reactions of a pyramidal Cu^II-containing ligand, {[Cu(L)₂(H₂O)]·3H₂O}_n (L_Cu), with Gd(ClO₄)₃·6H₂O, GdCl₃·6H₂O, GdCl₃·6H₂O/KCl, GdBr₃·6H₂O, or Gd(NO₃)₃·6H₂O in water. Structural analysis reveals that the structures of these compounds range from a 0D block to a 2D network with modification of the environment of the Cu^II ions compared with L_Cu. Interestingly, there occurred a series of reversible dissolution/reorganization equilibriums between the initial reactants and the final products 1–5, which were determined as enthalpy/entropy driven chemical equilibriums by single crystal X-ray diffraction and microcalorimetry. In addition, the thermal stability of 1–4 and the magnetic property of 2 are discussed.

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A Series of Enthalpy/Entropy-Driven Reversible Dissolution/Reorganization Equilibriums in the System of Cu(NO3)2–HL–GdX3–H2O (HL = 5-methylpyrazine-2-carboxylic acid; X = Cl, Br, NO3, ClO4)

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A Series of Enthalpy/Entropy-Driven Reversible Dissolution/Reorganization Equilibriums in the System of Cu(NO₃)₂–HL–GdX₃–H₂O (HL = 5-methylpyrazine-2-carboxylic acid; X = Cl, Br, NO₃, ClO₄)