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Issue 34, 2014
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A magnetically isolated cuprate spin-ladder system: synthesis, structures, and magnetic properties

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Abstract

We synthesized and characterized two magnetically isolated spin ladders, Cu2(CO3)(ClO4)2(NH3)6 (1) and Cu2(CO3)(ClO4)2(H2O)(NH3)5 (2), which are the first examples of carbonate bridging molecular spin ladders. Compounds 1 and 2 form a ladder configuration by stacking a structural unit composed of two Cu2+ ions and one CO32−, where the Cu–O–Cu interactions form the rungs and legs of each ladder and the counter anions (ClO4) occupy the space between the ladders and ensure their magnetic isolation. A S = 1/2 magnetically isolated spin-ladder model with a ladder-rung magnetic interaction J1/kB = 364 K (where J is defined as positive for antiferromagnetic interactions) and a ladder-leg magnetic interaction J2/kB = 27.4 K accurately predicts the temperature dependence of the molar magnetic susceptibility for 1. The ladder configuration of 2 is similar to that of 1 except that the CO32− is alternately skewed in different directions in the stacked structural unit. Interestingly, this minor structural variation in 2 results in its remarkably different magnetic behavior; the magnetic susceptibility curve of 2 is accurately described by an alternating chain model with J3/kB = 7.26 K and J4/kB = 4.42 K.

Graphical abstract: A magnetically isolated cuprate spin-ladder system: synthesis, structures, and magnetic properties

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The article was received on 12 Jun 2014, accepted on 01 Jul 2014 and first published on 17 Jul 2014


Article type: Paper
DOI: 10.1039/C4DT01746C
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Citation: Dalton Trans., 2014,43, 12974-12981
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    A magnetically isolated cuprate spin-ladder system: synthesis, structures, and magnetic properties

    X. Zhang, S. Nishihara, Y. Nakano, E. Yoshida, C. Kato, X. Ren, K. Yu. Maryunina and K. Inoue, Dalton Trans., 2014, 43, 12974
    DOI: 10.1039/C4DT01746C

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