Synthesis, characterisation and fluorescence property of a new one-dimensional polymer constructed from 5-nitroisophthalic acid

Abstract

A new metal-organic coordination polymer [Zn(5-nip)(2,2′-bipy)]·1·5H₂O (1) (5-nip = 5-nitroisophthalic acid; 2,2′-bipy = 2,2′-bipyridine) was synthesised by using hydrothermal reaction of 5-nip, Zn(NO₃)₂·6H₂O as well as 2,2′-bipy. Combined with the characterisation of elemental analysis, infrared spectrum, thermogravimetric analysis and X-ray single crystal diffractometer, it shows that the complex exhibits an infinite one-dimensional zigzag chain that was constructed with repeated units of [Zn(5-nip)(2,2′-bipy)]·1·5H₂O. In each units, the metal Zn(II) centre was coordinated by 2,2′-bipy and 5-nip ligands with five-coordinated number. While the 5-nip ligands link the Zn(II) centre to generate a one-dimensional zigzag chain. In addition, the complex 1 extends to a two-dimensional supramolecular architecture through π–π stacking and hydrogen bonds. The complex shows fluorescence at ambient temperature.

Keywords:

• Coordination polymer
• Crystal structure
• Zigzag chain
• Fluorescence

Acknowledgements

Authors thank the financial support from the National Innovation Fund for College Students (101012607), the Program for Science and Technology Leading Talent and Innovation Team of Inner Mongolia, the Program for the Development of Innovative Teams in Universities of Inner Mongolia (NMGIRT1105) and the Inner Mongolia Natural Science Foundation of China (grant no. 2010MS0202).