ChemInform Abstract: Internal Electron Transfer in a Quinone Adduct of a Nickel(II)-Catecholate Complex.

ChemInform Abstract

The tetrachlorocatecholatonickel(II) complex of the cyclic triamine reacts reversibly with tetrachlorobenzoquinone to give the Ni(I) complex (I), which crystallizes in P2₁/c with Z=4. The two dioxolene moieties interact with each other as shown by the very short distances. The intense absorption band at 12 700 cm^-1 is tentatively attributed to the transition between the HOMO of the semiquinone and the LUMO of the quinone. A MLCT character of this transition is also possible. This compound sheds light on the mechanism of electron transfer in dioxolene molecules in the presence of metal ions.