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- W2022577901 abstract "Abstract Two novel bimetallic compounds have been prepared from the copper(II) precursor [Cu(obp)]2−, namely CoCu(obp)(H2O)3·H2O (1) and NiCu(obp)(H2O)5·3.5H2O (2), obp standing for oxamidobis(N,N′-propionato). The crystal structures of 1 and 2 have been solved. Both compounds crystallize in the triclinic system, space group P 1 . ,The lattice parameters for 1 area a=8.642(1), b=9.197(1), c=10.645(2) A, α=67.14(1), β=62.28(1), γ=73.95(1)°, Z=2. Those of 2 are a=11.444(1), b=12.295(1), c=15.100(2) A, α=68.89(1), β=72.94(1), γ=76.26(1)°, Z=4 NiCu units. The structure of 1 consists of bimetallic chains in which the Co(II) and Cu(II) ions are alternately bridged by oxamido and carboxylato groups. In contrast, the structure of 2 consists of isolated oxamido-bridged Ni(II)Cu(II) units. The magnetic properties of both compounds have been investigated and quantitatively interpreted. In spite of its chain structure 1 does not show the one-dimensional ferrimagnetic behavior. It has been assumed that the interaction through the carboxylato bridged was very small. The magnetic data have been fitted with a model taking explicitly into account the orbital degeneracy of the Co(II) ion in a weak octahedral field. The magnetic behavior of 2 is in line with its structure with a strong intramolecular antiferromagnetic interaction between the spin carriers. Finally, the JMnCu, JCoCu and JNiCu interaction parameters through the oxamido bridge in related compounds have been compared." @default.
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- W2022577901 date "1993-10-01" @default.
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- W2022577901 title "Structures and magnetic properties of Co(II)Cu(II) and Ni(II)Cu(II) compounds incorporating the obp=oxamidobis(N,N′-propionato) ligand" @default.
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- W2022577901 doi "https://doi.org/10.1016/s0020-1693(00)92334-x" @default.
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