Jump to main content
Jump to site search

Issue 12, 2008
Previous Article Next Article

3D geometrically frustrated magnets assembled by transition metal ion and 1,2,3-triazole-4,5-dicarboxylate as triangular nodes

Author affiliations

Abstract

Three new chiral metal–organic frameworks, (H2NMe2)[M(tzdc)]·0.5H2O [M[double bond, length as m-dash]Co(II) (1), Mn(II) (2)] and (NH4)[Mn(tzdc)]·2.6H2O (3) (tzdc3 = 1,2,3-triazole-4,5-dicarboxylate), have been solvothermally synthesized. In the frameworks of 1–3, the ratio of metal and tzdc3− is 1 : 1. Each metal ion is chelated by three tzdc3− ligands, and each tzdc3− connects three metal ions, resulting in three-dimensional, 3-connected anionic frameworks. 1 and 2 are isomorphous, and both crystallize in the cubic space groupP213. With the template of H2NMe2+ cations, the frameworks of 1 and 2 have a well-known, porous (10,3)-a network. In contrast, 3 can be obtained by replacing the H2NMe2+ with smaller NH4+ cations, which leads to a significant topological change to a unique uniform etd (8,3) network as well as the change of the space group to P61. Magnetic studies show dominated antiferromagnetic interactions in 1–3 with θ = −46.8(1), −22.3(1) and −25.8(1) K for 1, 2 and 3, respectively. Due to the triangular arrangement of the metal centres, geometrically spin-frustrated magnetism is a characteristic behaviour of 1–3. For 1, spin-glassy behaviour with a freezing temperature Tf of 2.4 K was distinctly observed, and an empirical factor f = |θ |/Tf ≈ 20 > 10 indicates strong spin-frustration effect. For both 2 and 3, no obvious long-range magnetic ordering and/or spin–glassy behaviour was observed down to 2.0 K, which might indicate the f values in them being also larger than 10. By contrast, the observed spin-glassy behaviour above 2.0 K in 1 is probably due to the stronger magnetic anisotropy of Co(II) ion and the stronger antiferromagnetic interactions in 1.

Graphical abstract: 3D geometrically frustrated magnets assembled by transition metal ion and 1,2,3-triazole-4,5-dicarboxylate as triangular nodes

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Jun 2008, accepted on 28 Jul 2008 and first published on 12 Aug 2008


Article type: Paper
DOI: 10.1039/B809838G
CrystEngComm, 2008,10, 1770-1776

  •   Request permissions

    3D geometrically frustrated magnets assembled by transition metal ion and 1,2,3-triazole-4,5-dicarboxylate as triangular nodes

    W. Zhang, W. Xue, J. Lin, Y. Zheng and X. Chen, CrystEngComm, 2008, 10, 1770
    DOI: 10.1039/B809838G

Search articles by author

Spotlight

Advertisements