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Synfacts 2007(3): 0271-0271  
DOI: 10.1055/s-2007-968210
Synthesis of Materials and Unnatural Products
© Georg Thieme Verlag Stuttgart · New York

Di(1-azulenyl)methylium-Based Tetracations as Stabilized Electrochromic System

Contributor(s): Timothy M. Swager, Koushik Venkatesan
S. Ito*, K. Akimoto, J. Kawakami, A. Tajiri, T. Shoji, H. Satake, N. Morita
Hirosaki University and Tohoku University, Sendai, Japan
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Publication History

Publication Date:
20 February 2007 (online)

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Significance

The authors describe the preparation of two tetracations composed of di(1-azulenyl)methyl units connected to a benzene ring by either phenyl or 2-thienylacetylene spacers based on the new structural principle of a cyanine-cyanine hybrid for the design of multielectrochromic materials. The synthesis of these cations was accomplished by hydride abstraction from the corresponding hydro derivatives. These cations exhibit high pKR + values despite their tetracationic structure. The tetracations are remarkably unique structures and could find applications in electrochromic materials.