Inorganic Chemistry, Vol.58, No.11, 7537-7544, 2019
Nitrite Reduction by Trinuclear Copper Pyrazolate Complexes: An Example of a Catalytic, Synthetic Polynuclear NO Releasing System
Two trinuclear Cu-II pyrazolato complexes with a Cu-3(mu(3)-E)-core (E = O2- or OH-) and terminal nitrite ligands in two coordination modes were characterized crystallographically, spectroscopically, and electrochemically. One-electron oxidation of the mu(3)-O species produces a delocalized, mixed-valent, formally (Cu2CuIII)-Cu-II-nitrite, but no nitrate. In contrast, under reducing conditions-addition of PhSH as an electron and proton donor-both complexes mediate the reduction of nitrite, releasing NO.