Syntheses, structures, and properties of Cd^II and Co^II complexes with 5-(pyridin-4-yl)isophthalate

Abstract

A N-donor containing carboxylic ligand, 5-(pyridin-4-yl)isophthalic acid (H₂L), was applied to construct two new coordination polymers [Cd(L)(DMF)] _n (1, DMF = N,N-dimethylformamide) and {[Co(L)(H₂O)₂] · 0.5CH₃OH · 1.5H₂O} _n (2) under different conditions. The complexes were characterized by IR, elemental, and thermogravimetric analyses, powder and single crystal X-ray diffraction. In 1 each L²⁻ links four Cd^II to form a 3-D framework, while in 2 each L²⁻ connects three metals to form a 2-D layer structure, which is further connected together by hydrogen bonds to form a 3-D architecture. The thermal stability of the complexes and the photoluminescence of 1 were investigated.

Keywords:

• Cd^II complex
• Co^II complex
• Crystal structure
• Photoluminescence

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant no. 91122001 and 21021062) and the National Basic Research Program of China (Grant no. 2010CB923303).