INIFTA 05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
On the association and structure of radicals derived from dipyridil[3,2-a:23-c]phenazine, dppz. Contrast between the electrochemical, radiolytic and photochemical reduction processes
Autor/es:
M. P. JULIARENA; R. O. LEZNA; M. R. FELIZ; G. T. RUIZ; S. THOMAS; G. FERRAUDI; I. CARMICHAEL
Revista:
JOURNAL OF ORGANIC CHEMISTRY
Editorial:
American Chemical Society
Referencias:
Año: 2006 vol. 71 p. 2870 - 2873
ISSN:
0022-3263
Resumen:
Abstract The reduction of dipyridil[3,2-a:2¢3¢-c]phenazine, dppz, by pulse radiolytically generated esol or by the reaction of the dppz excited states with electron donors produces the radical dppzH. The dimer radical, (dppz)2H, exists in equilibrium with dppz with an association constant, K = 103 M-1. The rate constant for the reaction of dppzH with dppz is k = 4.3 x 106 M-1 s-1. DFT calculations on the structures of dppzH and the doubly reduced and doubly protonated dppzH2 rendered a planar structure for the former species and a bent one for the latter.
