Synthesis, crystal structure, and luminescence of a new zinc(II) coordination polymer based on 2-naphthol-5-carboxylate and 4,4′-bipyridine

Abstract

To further explore the coordination possibilities of naphthalene-based carboxylic acids, a Zn^II coordination polymer, [Zn₃(L)₆(bipy)₂] _n (1), with bulky 2-naphthol-5-carboxylate (L) and bridging 4,4′-bipyridine (bipy), was synthesized and characterized. Structural analysis reveals that 1 is a 1-D polymeric chain with trinuclear units as nodes, which are further extended via interchain secondary interactions, such as O–H ··· O hydrogen-bonding and aromatic π ··· π stacking interactions, to form an overall 3-D framework. Complex 1 exhibits strong solid-state luminescence emission at room temperature, mainly originating from intraligand π→π* transition of L.

Keywords:

• Zn^II complex
• 2-Naphthol-5-carboxylate ligand
• Crystal structure
• Luminescent property

Acknowledgments

This work was supported by the National Natural Science Funds of China (Grant Nos. 20801049 and 20771095), the Startup Fund for PhDs of Natural Scientific Research of Zhengzhou University of Light Industry (Grant No. 2007BSJJ001 to Chun-Sen Liu), and the Basic and Frontier Technology Research Program of Henna Province (No. 092300410127 to Li-Ming Zhou).