Introduction of 12 nitro substituents on Zn(II) and Ni(II) [meso-tetra-(2,6-dichlorophenyl)porphyrin = TDCPP] was performed by adapting a recently described method for polynitration of metalloporphyrins, allowing the one-pot synthesis of metallodode-canitroporphyrins from commercially available compounds. The corresponding complexes exhibit the highest reduction potentials ever described for such metalloporphyrins, which are shifted by more than + 1.6 V when compared with those of Zn and Ni(TDCPP The Ni (dodecanitroporphyrin) complex underwent four successive. reversible one-electron reductions between + 470 and 555 mV (vs. SCE). The one-electron reduction product of the Ni dodecanitroporphyrin is stable for hours at room temperature even in aerobic conditions. its visible and EPR spectra indicate a Ni (porphyrin radical anion) structure. (C) 2002 Elsevier Science B.V. All rights reserved.
Ozette, Karine; Leduc, Philippe; Palacio, Magali, Journal of the American Chemical Society, 1997, vol. 119, p. 6442 - 6443