Syntheses, structures, and luminescence of coordination compounds based on N-containing polycarboxylates

Abstract

Six coordination compounds constructed by two structurally related flexible nitrogen-containing polycarboxylate ligands 2,2′-(2,2′-(ethane-1,2-diylbis(oxy))bis(2,1-phenylene))bis(methylene)bis(azanediyl)dibenzoic acid (H₂L1) and 5,5′-(2,2′-(ethane-1,2-diylbis(oxy))bis(2,1-phenylene))bis(methylene)bis(azanediyl)diisophthalic acid (H₄L2) have been synthesized: [Ni(H₂O)₆] · L1 · (C₂H₅OH)_0.5 · H₂O (1), [Co(L1)(L3)] · CH₃OH (2), [Ni(L1)(L3)] · CH₃OH (3), [Zn(L1)(L3)] · CH₃OH (4), [Cd(L1)(L3)] · CH₃OH (5), and [Zn(L2)_0.5(phen)] · C₂H₅OH (6), where L3 = 3,4 : 9,10 : 17,18 : 23,24-tetrabenzo-1,12,15,26-tetraaza-5,8,19,22-tetraoxacyclooctacosan and phen = 1,10-phenanthroline. The crystal structures have been determined by single-crystal X-ray diffraction. Compound 1 displays a discrete structure, which is further linked by hydrogen bonds to form a 2-D supramolecular layer. Compounds 2–5 display similar structures. These compounds possess 1-D meso-chain structures linked by L1 and metals. The C–H ··· π interactions from neighboring chains extend the chains in different directions, giving a 3-D plywood network. Compound 6 possesses 2-D layers, which are further linked by hydrogen-bonding interactions to generate a 3-D supramolecular architecture.

Keywords:

• Coordination polymers
• N-containing polycarboxylate
• Crystal structure

Acknowledgments

We thank the National Natural Science Foundation of China (grant nos 21071028, 21001023), the Science Foundation of Jilin Province (20090137), the Fundamental Research Funds for the Central Universities, the Specialized Research Fund for the Doctoral Program of Higher Education, the China Postdoctoral Science Foundation (20080431050 and 200801352), the Training Fund of NENU's Scientific Innovation Project, and the Analysis and Testing Foundation of Northeast Normal University for support.