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Two-dimensional magnetic materials of cobalt(II) triangular lattices constructed by the mixed benzimidazole-dicarboxylate strategy

Abstract

Frustrated spin systems, like triangular lattice, are of high interest in the field of chemistry, physics and materials science. However, the design and synthesis of such systems are difficult and serendipitous. Herein, we have developed a straightforward and effective strategy for the design and construction of geometrically frustrated triangular lattices based on mixed benzimidazole-dicarboxylate strategy. By using this method, we synthesized and characterized a series of three air-stable CoII coordination polymers (CPs), namely [Co3(1,4-BDC)3(NO2-BIm)2(MeOH)2]n (1), {[Co3(1,4-BDC)3(Cl-BIm)2]·2MeOH2}n (2), and {[Co3(1,4-BDC)3(CH3O-BIm)2]·2DMF}n (3), (1,4-BDC = 1,3-benzenedicarboxylate, NO2-BIm = 5-Nitrobenzimidazole, Cl-BIm = 5-Chlorobenzimidazole, CH3O-BIm = 5-Methoxybenzimidazole), with geometrically frustrated triangular lattices. Single-crystal X-ray diffraction studies reveal that compounds 1-3 exhibit two-dimensional (2D) layer structures formed by linear trimeric Co3 secondary building units. The Co3 units exhibit a Oh-Oh-Oh geometry in 1 and a mixed Td-Oh-Td geometries in 2 and 3. Interestingly, the triangular lattices of 1-3 were tuned by different benzimidazole derivatives, resulting in distinct frustrated structures. Nitrogen adsorption-desorption isotherms indicate their diverse Brunauer−Emmett−Teller (BET) surface areas of 1-3 are 822, 877 and 943 m2 g−1. Magnetic measurements indicate that 1 shows the coexistence of long-range magnetic ordering and spin frustration while 2 and 3 display dominated frustration behavior. This simple synthetic method provides an alternative in the design of frustrated triangular lattices.

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Publication details

The article was received on 24 Jan 2019, accepted on 12 Mar 2019 and first published on 12 Mar 2019


Article type: Paper
DOI: 10.1039/C9CE00129H
Citation: CrystEngComm, 2019, Accepted Manuscript

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    Two-dimensional magnetic materials of cobalt(II) triangular lattices constructed by the mixed benzimidazole-dicarboxylate strategy

    J. Kong, Y. Jiang, J. Zhang, D. Shao and X. Huang, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE00129H

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