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A novel oxalate-based three-dimensional coordination polymer showing magnetic ordering and high proton conductivity

Abstract

A novel three-dimensional (3D) coordination polymer of formula (C3N2H5)4[MnCr2(ox)6] . 5H2O (2), where ox = oxalate and C3N2H5 = imidazolium cation, is reported. Single crystal X-ray diffraction reveals that this porous coordination polymer adopts a chiral three-dimensional quartz-like architecture, the guest imidazolium cations and water molecules being hosted in its pores. This novel multifunctional material exhibits both, a ferromagnetic ordering at TC=3.0 K, related to the host MnCr2 network, and high proton conductivity [1.86×10-3 S cm-1 at 295 K and 88% relative humidity (RH)] due to the presence of the acidic imidazolium cations and free water molecules. The similarity of the structure of compound 2 with that of the previously reported analogous compound (NH4)4[MnCr2(ox)6] . 4H2O, (1), also allows to analyse the effect of the acidity of the proton donating guest molecules on proton conduction properties. 2 hosts, in one-dimensional (1D) channels, imidazolium cations, more acidic than the ammonium ones in 1 and, as a consequence, 2 shows higher proton conduction than 1 highlighting the effect of the pKa of the proton donating guest molecules on proton conductivity.

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Publication details

The article was received on 13 Sep 2017, accepted on 07 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT03415F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    A novel oxalate-based three-dimensional coordination polymer showing magnetic ordering and high proton conductivity

    M. Mon, J. Vallejo, J. Pasán, O. Fabelo, C. Train, M. Verdaguer, S. Ohkoshi, H. Tokoro, K. Nakagawa and E. Pardo, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03415F

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