Solvothermal synthesis, structure, and luminescence of a 3-D Cd(II) complex assembled with biphenyl-2,5,2′,5′-tetracarboxylic acid involving in situ ligand reaction

Abstract

A 3-D metal-organic framework [Cd₃(L)₂(DMF)₂] · 2H₂O · 2DMF (1) (H₃L = 2-(dimethylcarbamoyl)biphenyl-5,2′,5′-tricarboxylic acid, DMF = N,N-dimethylformamide) with trinuclear Cd(II) units has been prepared. Complex 1 is a (3, 6)-connected (4² · 6)₂(4⁴ · 6² · 8⁸ · 10) coordination net, which results from the solvothermal in situ formation of a new asymmetric ligand, 2-(dimethylcarbamoyl)biphenyl-5,2′,5′-tricarboxylic acid (H₃L), through amidation of biphenyl-2,5,2′,5′-tetracarboxylic acid (H₄bptc). Additionally, the luminescence of 1 has been investigated.

Keywords:

• Trinuclear Cd(II) unit
• Amidation reaction
• Topology
• Photoluminescent

Acknowledgments

We gratefully acknowledge financial support by the NSF of China (Nos. 21071027 and 20771023), the China High-Tech Development 863 Program (No. 2007AA03Z218), and analysis and testing foundation of Northeast Normal University.