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Synthesis, crystal structure and magnetic characterization of metal(II) coordination polymers based on 2-carboxyethylphosphonic acid and 1,10-phenanthroline (metal=Cu, Co, Cd) |
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| Authors: | Eva Fernández-Zapico Richard D’Vries Santiago García-Granda Imanol de Pedro |
| Institution: | a Departamentos de Química Física y Analítica y Química Orgánica e Inorgánica, Universidad de Oviedo—CINN, 33006 Oviedo, Spain b Instituto de Ciencias de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain c CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain d Departamento de Física, Universidad de Oviedo, 33007 Oviedo, Spain |
| Abstract: | Three non-isostructural metal(II) coordination polymers (metal=copper, cobalt, cadmium) were synthesized under the same mild hydrothermal conditions (T=408 K) by mixture of the corresponding metal acetate with 2-carboxyethylphosphonic acid and 1,10-phenanthroline (1:1:1 M ratio) and their structures were determined by single-crystal X-ray diffraction. Cu2(HO3PCH2CH2COO)2(C12H8N2)2(H2O)2 and Cd2(HO3PCH2CH2COO)2(C12H8N2)2 are triclinic (space group P-1) with a=7.908(5) Å, b=10.373(5) Å, c=11.515(5) Å, α=111.683(5)°, β=95.801(5)°, γ=110.212(5)° (T=120 K), and a=8.162(5) Å, b=9.500(5) Å, c=11.148(5) Å, α=102.623(5)°, β=98.607(5)°, γ=113.004(5)° (T=293 K), respectively. In contrast, Co2(HO3PCH2CH2COO)2(C12H8N2)2(μ-OH2)](H2O) is orthorhombic (space group Pbcn) with a=21.1057(2) Å, b=9.8231(1) Å, c=15.4251(1) Å (T=120 K). For these three compounds, structural features, including H-bond network and the π-π stacking interactions, and thermal stability are reported and discussed. None of the materials present a long-range magnetic order in the range of temperatures investigated from 300 K down to 1.8 K. |
| Keywords: | Coordination polymers Hydrothermal synthesis Crystal structure Magnetic characterization |
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