Redox potentials of isomeric ethyl 5 ferrocenyl 1H pyrazole 3 carboxylates 2 and ethyl 5 ferrocenyl 1H pyrazole 4 carboxylates 4 were measured and their dependences on the acidity of the medium were determined. The structures of various conformers of neutral molecules and corresponding radical cations were calculated by the B3LYP/6 31G* method. The results of calculations for neutral molecules were confirmed by X ray data.
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