213014-92-7Relevant articles and documents
Preparation and characterization of novel DPPH-based diradicals
Kozaki, Masatoshi,Nakamura, Shogo,Sato, Kazunobu,Takui, Takeji,Kamatani, Takeaki,Oda, Masaji,Tokumaru, Katsumi,Okada, Keiji
, p. 5979 - 5982 (2007/10/03)
A series of 1,1'(2,4-di-X-benzene-1,3-diyl)bis[1-(4-Y-phenyl)-2- picrylhydrazine]s were prepared an oxidized to generate the corresponding bis-DPPH diradicals. No triplet species was observed for the compounds with X = H in the ESR measurement. Modification of the central benzene ring (x = Me) and N-phenyl group (Y = OMe, P, t-Bu) allowed the detection of their triplet diradicals. Especially, the diradical with X = Me, Y = t-Bu was successfully purified, isolated at O aC as a purple solid, and was shown to be in a triplet ground state.