Journal
INORGANIC CHEMISTRY
Volume 54, Issue 4, Pages 1597-1605Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic502586a
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Funding
- Departamento de Quimica de la Universidad de La Laguna
- Ministerio Espanol de Ciencia e Innovacion [MAT2010-16981]
- Programa FPI of ACIISI from Gobierno de Canarias
- Fondo Social Europeo
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Two compounds of formula {(H3O)[Cu-7(Hmesox)(5)(H2O)(7)].9H(2)O}(n) (1a) and {(NH4)(0).(6)(H3O)(0).(4)[Cu-7(Hmesox)(5)(H2O)(7)].11H(2)O}(n) (1b) were prepared and structurally characterized by single-crystal x-ray diffraction (H(4)mesox = mesoxalic acid, 2-dihydroxymalonic acid). The compounds are crystalline functional metalorganic frameworks exhibiting proton conduction and magnetic ordering. Variable-temperature magnetic susceptibility measurements reveal that the copper(II) ions are strongly ferro- and antiferromagnetically coupled by the alkoxide and carboxylate bridges of the mesoxalate linker to yield long-range magnetic ordering with a T-c of 17.6 K, which is reached by a rare mechanism known as topologic ferrimagnetism. Electric conductivity, measured by impedance methods, shows values as high as 6.5 x 10(-5) S cm(-1) and occurs by proton exchange among the hydronium/ammonium and water molecules of crystallization, which fill the voids left by the three-dimensional copper(II) mesoxalate anionic network.
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