Two d¹⁰ Complexes Constructed From the N-Heterocycle Spacer and Benzyl-Bicarboxylate Mixed Ligands

Abstract

To investigate the fundamental impact of the spacer to the weak intermolecular interactions in the molecular assembly, the authors synthesized two new complexes, namely {Cd(C₁₀N₅H₉)₂(C₈H₄O₄)}_n (1), and {Zn(C₁₀N₅H₉)(C₈H₄O₄)}_n (2) (H₂bdc = 1,4-benzenedicarboxylic acid; bmi = 1-((benzotriazol-yl)methyl)-1H-1,3-imidazole), which were obtained by the reactions of 1-((benzotriazol-yl)methyl)-1H-1,3-imidazole (bmi) as main ligand, and 1,4-benzenedicarboxylate as organic anions with Zn(II) and Cd(II) salts. The benzimidazole rings act as the directing group for π···π stacking interactions. Such π···π interactions and hydrogen bonds play important roles to extend the 1D chain structures to 3D supramolecular motifs. Additionally, both complexes exhibit strong luminescence emission in the solid state at room temperature.

Keywords:

• crystal structure
• luminescence property
• mixed ligands
• Zn(II)/Cd(II) complexes

Acknowledgments

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Nos. 20971110 and J0830412), and The Talent Supporting Plan of Henan Scientific and Technological Innovation (No. 2010HASTIT016).