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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 15 (2010) pp 3-4

Classroom Demonstration of A Novel Colorless Cupric Complex

Luo Yang-he, , Yang Hai-jun, Zhang Hao, and Li Yong,*

Department of Chemical and Biological Engineering, Hezhou University, Hezhou, Guangxi 542800, People's Republic of China; Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China,
Received November 21, 2008. Accepted June 26, 2009.

Published: 9 January 2010

Abstract. A novel colorless 3dz2 ground-state doublet [Cu(15C5)(H2O)2](ClO4)2 complex in CH3CN was prepared in the molar ratio of 1:3 Cu(ClO4)2 to 15-Crown-5 and in the concentration range of Cu(ClO4)2 from 6.0 10-3 mol/L to 1.0 10-2 mol/L . The UV-Vis spectrum shows that the complex has scarcely any absorption in the range of 400~800nm. A simple and quick classroom demonstration is described for the formation of the colorless Cu(II) complex.

Key Words: Laboratories and Demonstrations; general chemistry

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