Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Generation and ESR Spectrum of a Persistent and Oxygen-Insensitive Free Radical. 2,7-Di-t-butyl-1-pyrenoxy
Yozo MiuraEiji YamanoAkira MiyazawaMasashi Tashiro
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1994 Volume 23 Issue 5 Pages 867-870

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Abstract

Oxidation of 2,7-di-t-butyl-1-hydroxypyrene yields persistent and oxygen-insensitive 2,7-di-t-butyl-1-pyrenoxy radical (2) with the following ESR parameters: (aH) 0.532, 0.449, 0.430, 0.389, 0.164, 0.110, and 0.095 mT (aH), and 2.0037 (g). Radical 2 is isolated as a diamagnetic dimer which, upon dissolution, dissociates into 2 at room temperature. The ΔH and ΔS values for the dimer 2 radical equilibrium are determined to be 7.2 ± 2.0 kJ mol−1 and −35 ± 15 J mol−1 K−1, respectively. The negative ΔS value is briefly discussed.

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© 1994 The Chemical Society of Japan
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