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Magnetic, thermal, and neutron diffraction studies of a coordination polymer: bis(glycolato)cobalt(II)

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Abstract

The two-dimensional quadratic lattice magnet, bis(glycolato)cobalt(II) ([Co(HOCH2CO2)2]), showed antiferromagnetic ordering at 15.0 K and an abrupt increase in magnetisation at H = 22 600 Oe and 2 K, thereby acting as a metamagnet. Heat capacity measurements revealed that the associated entropy change ΔS around the transition temperature was evaluated to be 6.20 J K−1 mol−1 and that the Co(II) ion had the total angular momentum of J = 1/2 at low temperatures. Neutron diffraction studies suggested that the magnetic moment vectors of the Co(II) ions had an amplitude of 3.59μB and were not aligned in a fully antiparallel fashion to those of their neighbours, which caused canting between the magnetic moment vectors in the sheet. The canting angle was determined to be 7.1°. Canting induced net magnetisation in the sheet, but this magnetisation was cancelled between sheets. The magnetisations in the sheets were oriented parallel to the magnetic field at the critical magnetic field.

Graphical abstract: Magnetic, thermal, and neutron diffraction studies of a coordination polymer: bis(glycolato)cobalt(ii)

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Publication details

The article was received on 01 Nov 2018, accepted on 28 Nov 2018 and first published on 28 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT04358B
Citation: Dalton Trans., 2019, Advance Article
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    Magnetic, thermal, and neutron diffraction studies of a coordination polymer: bis(glycolato)cobalt(II)

    T. Nakane, S. Yoneyama, T. Kodama, K. Kikuchi, A. Nakao, T. Ohhara, R. Higashinaka, T. D. Matsuda, Y. Aoki and W. Fujita, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C8DT04358B

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