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Air-Stable Tetrazene Radical Cation Salts: Structural Requirements and Oxidation Catalysts
Ayari Oshiro1, Yusuke Sasano1, Shu Saito1
1Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
None:
In this study, stable tetrazene radical cation salts were synthesized and characterized for the first time. The radical cation derived from 1,2-di(2-azaadamantan-2-yl)diazene (DAD) was isolated as an air-stable solid, retaining its integrity for at least 120 days at ambient temperature (∼25 °C) and pressure. X-ray crystallography and electron spin-resonance spectroscopy revealed the delocalization of the unpaired electron over the tetrazene core and into the adamantane framework. DAD undergoes two well-separated, reversible redox processes and displays high catalytic activity for alcohol oxidation under mild conditions. Systematic structural modifications identified the key framework features governing the radical cation stability and catalytic performance.
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