A cyclic water octamer in a binuclear copper(II) complex: synthesis, crystal structure, and properties

Abstract

A cyclic octameric water cluster is trapped in a 3-D supramolecular architecture [Cu₂(H₂O)₂(bpca)₂L]8H₂O, where bpca = bis(2-pyridylcarbonyl)amide and L = sebacic acid. The striking feature of the octameric cluster is that each water donates one hydrogen to adjacent waters to form a circular water ring in a (O–HO–H)₄ connecting fashion, with the same orientations of OH bonds in the ring. Thermogravimetric and magnetic properties are also reported.

Keywords:

• Cu(II) complex
• Water cluster
• Crystal structure
• Magnetic property

Acknowledgments

This project was supported by the Scientific Research Fund of the Zhejiang Provincial Education Department (grant no. Y201017782). The honest thanks are also extended to K.C. Wong Magna Fund of Ningbo University.