Syntheses and magnetic properties of a series of discrete Ni(II)-Ln(III) heterometallic complexes based on 2,3-dichlorobenzoate and 2,2′-bipyridine

Herein, a series of zero-dimensional (0D) heterometallic complexes, [Ln2Ni2(2,3-DCB)10(2,2 '-bpy)2] [Ln = Nd (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6), Er (7) and Yb (8)], were obtained by the reactions of Ln(NO3)3.nH2O, Ni(NO3)2.6H2O, 2,3-dichlorobenzoic acid (2,3-HDCB), NaOH and 2,2 '-bipyridine (2,2 '-bpy) under solvothermal conditions. The structures of complexes 1-8 were determined by single-crystal X-ray diffraction and further characterized by elemental analysis, FT-IR, PXRD and TGA. Complexes 1-8 are isostructural, and display discrete linear tetranuclear cluster structures constructed from ten 2,3-DCB anions linking two Ln(III) and two Ni(II) ions by four types of coordination modes. Such linear tetranuclear molecules can be extended into a two-dimensional (2D) supramolecular network through 7C-7C interactions between 2,3-DCB and 2,2 '-bpy. The magnetic properties of complexes 1-8 were also studied.

Automated summary

A series of zero-dimensional heterometallic complexes were synthesized and characterized, showing isostructural features and the ability to form a two-dimensional supramolecular network. The structures and magnetic properties of these complexes were extensively studied.