Multinuclear-based copper coordination architectures constructed from pyridyl-1H-benzimidazol-derived flexible tripodal connector and the magnetic behaviors

Consideration of multinuclear-based coordination architecture with specific properties, two new copper complexes based on a tripodal flexible ligand 1,3,5-tris[(2-pyridyl-1H-benzimidazol)-1yl-methyl]-2,4,6-trimethylbenzene (TPBT), namely, [CuI4CuII4(TPBT)4(μ-Cl)4Cl8(H2O)17]n (1), [Cu6(TPBT)2(SO4)6(H2O)5]n (2), have been constructed under the solvothermal reactions. Complex 1 is a 2D reticulate structure with the mixed-valence Cu(I,II) centers. While complex 2 features an inclined interpenetration of 2D sheets, which lead to the 3D supramolecular architecture, and its asymmetric unit contains six distinct Cu(II) centers. In addition, upon decreasing the temperature, the χmT value of 1 increases gradually to a maximum at 82 K and then decreases. Whereas the sample of 2 is cooled, the feature of χmT value exhibits antiferromagnetic interactions between Cu(II) centers.

Two multinuclear-based copper complexes based on a tripodal flexible ligand with multidentate branched N-containing domains have been constructed under the solvothermal reaction. Upon decreasing the temperature, the χmT value of complex 1 first increases gradually to a maximum at 82 K and then decreases until 1.8 K. While the sample of 2 is cooled, the feature of χmT value exhibits antiferromagnetic interactions between Cu(II) centers.Figure optionsDownload as PowerPoint slide