Assembly of a New 2D Heterometallic 3d–4f Coordination Polymer Bearing Planar Tetranuclear Square Building Blocks

Abstract

A new two-dimensional (2D) 3d–4f heterometallic coordination polymer, which is {[Tb 2 Zn 4 (µ 3 -TFMIDC) 4 (µ 4 -HTFMIDC)(H 2 O) 8 ]·2H 2 O} n , has been successfully synthesized by the solvothermal reaction of 2-(trifluoromethyl)-1H-4,5-imidazole dicarboxylic acid (H 3 TFMIDC) with Zn(II) and Tb(III) ions. The title compound was structurally characterized by diverse characterization techniques including single-crystal X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Single-crystal structure analysis reveals that the as-preprared compound is a 2D heterometallic 3d–4f coordination network based on interesting planar tetranuclear squares [Zn 4 (TFMIDC) 4 ] as building blocks, representing the first example of novel heterometallic coordination polymer based on the H 3 TFMIDC ligand. In addition, the title compound exhibits very intense green luminescence and characteristic transitions of the Tb(III) ion when excited at 291 nm. Lattice parameters for the title compound: a = 11.1449(12) Å, b = 12.8498(13) Å, c = 37.553(4) Å, α = β = γ = 90°, V = 5378.0(10) Å 3 , Z = 4. Graphical Abstract: A unique 2D 3d–4f heterometallic coordination polymer containing interesting planar tetranuclear square building blocks has been constructed by the solvothermal reaction of 2-(trifluoromethyl)-1H-4,5-imidazole dicarboxylic acid (H 3 TFMIDC) with Zn(II) and Tb(III) ions. [Figure not available: see fulltext.].