Construction of one new two-dimensional Zn(II) coordination polymer based on thiophene-2,5-dicarboxylate and bis(imidazole) mixed ligand

ABSTRACT

Under hydrothermal conditions, a new two-dimensional (2D) zinc coordination polymer, [Zn(tdc)(bimm)]_n, was synthesized based on thiophene-2,5-dicarboxylic acid (H₂tdc) and 1,2-bis(imidazol-1′-yl)methane (bimm) mixed ligands. Single crystal X-ray structural analysis shows adjacent Zn²⁺ ions are connected by tdc²⁻ anions to form a one-dimensional (1D) [ZnL]_n chain in the complex. Then flexible bimm ligands expand 1D chains into a 2D layer by linking neighboring Zn²⁺ ions. These adjacent layers are further stacked together by direct C−H···π supramolecular interactions, generating a double-layer 2D supramolecular structure. In topology, the 2D lay could be rationalized to a uninodal 4-connected non-interpenetrated sql net with {4⁴.6²} topology. In addition, solid state properties such as thermogravimetric analysis and luminescence were also investigated.

KEYWORDS:

• Crystal structure
• thiophene-2,5-dicarboxylic acid
• zinc coordination polymer
• 1,2-bis(imidazol-1′-yl)methane

Funding

This work was supported by the National Natural Science of Foundation of China (No. 31270388).

Supplementary materials

Crystallographic data for the structural analysis have been deposited with the Cambridge Crystallographic Data Center with registration number CCDC 1455676. Copies of this information can be obtained free of charge via http://www.ccdc.cam.ac.uk/conts/ retrieving.html, or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: [phone].