A new mononuclear complex Cu(tdp)Br2·MeCN (1, tdp = 2,2′-(1H-1,2,3-triazole-1,4-diyl)dipyridine) has been synthesized, which can transform to a 1D coordination polymer [Cu(tdp)Br2]n (2) under ambient conditions through an irreversible single-crystal-to-single-crystal transformation process. The loss of lattice MeCN molecules in 1 was accompanied by the generation of new covalent bonds and an increase in dimensionality from 0 to 1D, leading to a change in magnetic exchange couplings between the adjacent Cu(II) ions. Magnetic susceptibility measurements indicate that 1 exhibits ferromagnetic interactions between the adjacent Cu(II) centers, while the intrachain magnetic interactions between Cu(II) ions are antiferromagnetic within 2.
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We are grateful to the National Natural Science Foundation of China (21002076, 21441007), the Open Fund Project NO. KLSAOFM1709 of Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Function Molecules, Hubei University and the Science Foundation of Wuhan Institute of Technology (19QD37).
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Ouyang, F., Jiang, X., Liu, X. et al. Synthesis, structures and magnetic properties of copper(II) complexes with 1,2,3-triazole derivate as ligand: a single-crystal-to-single-crystal transformation from mononuclear to polymeric complex of copper(II). Transit Met Chem 46, 315–322 (2021). https://doi.org/10.1007/s11243-021-00448-6