Synthesis, structures, and properties of lead(II) and cobalt(II) metal-organic frameworks based on a flexible benzophenone-2,4′-dicarboxylic acid (H₂bpdc)

Abstract

Two new coordination polymers, [Pb(bpdc)] _n (1) and [Co(bpdc)(phen)] _n (2) [H₂bpdc = benzophenone-2,4′-dicarboxylic acid, phen = 1,10-phenanthroline], have been synthesized and structurally characterized. Hydrogen bonding and π ··· π stacking extend 1 and 2 into 3-D supramolecular architectures, where 1 exhibits a 3-D framework with 1-D hairpin-like helicates based on Pb–O covalent bonds and 2 displays a 3-D network with 1-D zipper-like chains based on Co–O and Co–N covalent bonds. The FT-IR spectra, PXRD and TG analyses are discussed for 1 and 2. Fluorescence spectra and luminescent lifetime are studied for 1.

Keywords:

• Coordination polymer
• Hydrogen bonding
• π ··· π Stacking
• Fluorescence
• Luminescent lifetime

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20771090), State Key Program of National Natural Science of China (No. 20931005), Natural Science Foundation of Shaanxi Province (No. 2009JZ001), and Specialized Research Fund for the Doctoral Program of Higher Education (No. 20096101110005).