Syntheses, structures, and fluorescence of two cadmium compounds [Cd₂(pqc)₄(phen)₂(H₂O)₂] · 2H₂O and {[Cd(pqc)₂(bpy)(H₂O)₂] · 2H₂O}_n

Abstract

Assembly of 2-phenylquinoline-4-carboxylic acid and Cd(CH₃COO)₂ · 2H₂O or CdSO₄ · 8H₂O gave two new complexes [Cd₂(pqc)₄(phen)₂(H₂O)₂] · 2H₂O (1) and {[Cd(pqc)₂(bpy)(H₂O)₂] · 2H₂O} _n (2) (pqcH = 2-phenylquinoline-4-carboxylic acid, phen = 1,10-phenanthroline, bpy = 4,4′-bpy). Complexes 1 and 2 have been characterized by single-crystal X-ray diffraction, IR, powder X-ray diffraction, thermogravimetric analyses, and fluorescence spectra. Structural analyses reveal that 1 is binuclear; the binuclear Cd(II) units are linked by intermolecular hydrogen bonds and π–π interactions to generate a supramolecular structure. Complex 2 possesses a 1-D infinite chain with chains further assembled into a 3-D supramolecular network by π–π, H-bonding, and C–H ··· π interactions.

Keywords:

• Cadmium compounds
• Crystal structures
• Fluorescence

Acknowledgments

The work was supported by the National Natural Science Foundation of China (20971075), the “Qianjiang Talent” Projects of Zhejiang Province (2009R10032), the Ningbo Natural Science Foundation (2010A610060), the Program for Innovative Research Team of Ningbo Novel Photoelectric Materials and Devices (2009B21007), and the K.C. Wong Magna Fund in Ningbo University.