Two Extended 5‐Methyltetrazolate‐Based Magnetic Complexes: Synthesis,Structure, and Magnetic Properties |
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| Authors: | Jing Liu Hui‐Ming Dong En‐Cui Yang Xiao‐Jun Zhao |
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| Institution: | College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic‐Organic Hybrid Functional Material Chemistry, Ministry of Education, Tianjin Normal University, Tianjin 300387, P. R. China |
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| Abstract: | Two 5‐methyl‐tetrazolate (mtz–)‐based paramagnetic metal coordination polymers, {Cu2(H2O)2(mtz)(μ3‐OH)(nip)] · H2O}n ( 1 ) and Cu(H2O)(mtz)2]n ( 2 ), were obtained in the presence and absence of aromatic 5‐nitroisophathalate (nip2–) coligand by varying the preparation methods. Structural determinations reveal that 1 is a three‐dimensional (3D) framework with corner‐sharing triangular ribbons infinitely extended by ditopic nip2– connectors. In contrast, 2 is a coplanar (4,4) layer constructed from square‐pyramidal CuII ions and μ‐N1,N4‐mtz– linkers, which is further assembled into a 3D supramolecular network by interlayer hydrogen‐bonding interactions. Magnetically, spin‐frustrated antiferromagnetic ordering is observed in the 3D framework of 1 and canted antiferromagnetic behavior with a slight spin‐flop transition is presented in 2 , which are structurally resulting from the locally Δ‐ribbon in 1 and asymmetric magnetic superexchange mediated by the μ‐N1,N4‐mtz– bridge of 2 . |
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| Keywords: | 5‐Methyl‐tetrazolate Paramagnetic metal complexes Copper Magnetic properties Spin‐flop transition |
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