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Issue 26, 2013
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Crystal structures and variable magnetism of PbCu2(XO3)2Cl2 with X = Se, Te

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Abstract

Novel Cu2+-based compounds PbCu2(SeO3)2Cl2 (space group C2/c; a = 13.056(1) Å; b = 9.5567(9) Å; c = 6.9006(6) Å; β = 90.529(7)°; RI = 0.0371) and PbCu2(TeO3)2Cl2 (space group P21; a = 7.2401(2) Å; b = 7.2688(2) Å; c = 8.2846(2) Å; β = 96.416(2)°; RI = 0.0570) have been obtained by solid-state synthesis. Their crystal structures are remarkably dissimilar and underlie a very different magnetic behavior. While PbCu2(SeO3)2Cl2 can be well described by a spin-chain model with an exchange coupling of J1 ≃ 160 K, PbCu2(TeO3)2Cl2 is a spin-dimer system that, however, features a comparable magnetic nearest-neighbor coupling of J ≃ 213 K. PbCu2(SeO3)2Cl2 orders antiferromagnetically below 12 K, whereas PbCu2(TeO3)2Cl2 lacks long-range magnetic order down to at least 2 K, owing to the strong dimerization of the Cu2+ spins. Crystal structures of both compounds are rationalized in terms of relevant magnetic exchange pathways, and the implications for a broader range of Cu2+ compounds are discussed.

Graphical abstract: Crystal structures and variable magnetism of PbCu2(XO3)2Cl2 with X = Se, Te

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Publication details

The article was received on 14 Feb 2013, accepted on 22 Apr 2013 and first published on 23 Apr 2013


Article type: Paper
DOI: 10.1039/C3DT50426C
Citation: Dalton Trans., 2013,42, 9547-9554
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    Crystal structures and variable magnetism of PbCu2(XO3)2Cl2 with X = Se, Te

    P. S. Berdonosov, O. Janson, A. V. Olenev, S. V. Krivovichev, H. Rosner, V. A. Dolgikh and A. A. Tsirlin, Dalton Trans., 2013, 42, 9547
    DOI: 10.1039/C3DT50426C

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