A lead(II) coordination polymer containing 2-carboxycinnamic acid and 1,10-phenanthroline and its 3-D supramolecular network

Abstract

The coordination polymer {[Pb(cca)(phen)]H₂O} _n (H₂cca = 2-carboxycinnamic acid and phen = 1,10-phenanthroline) was synthesized by hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. The complex possesses a 1-D chain structure composed of infinite Pb-cca-Pb linkages, in which the [PbO₄N₂] subunits are linked by bridging cca in bis(chelating-bridging) coordination mode. The coordination around the lead(II) is hemi-directed and weak Pb···O interactions are observed that result in a double-chain structure. The chains are combined to generate a 3-D supramolecular structure through interchain C–H···π, C–H···O, and π···π stacking interactions. Fluorescence of the complex originates from π*–π transitions of the ligand.

Keywords:

• Lead coordination polymer
• 2-Carboxycinnamic acid
• Crystal structure

Acknowledgments

The work was supported by the National Natural Science Foundation of China (21071101).