Ab initio calculations on Fe_2S_2Cl_4~(2-)

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Complexes Fe_2S_2(SH)_4~(2-) and Fe_2S_2Cl_4~(2-),which are model of the active sites of 2-Fe fer-rodoxin proteins,have been studied a great deal in the past decade for the interests in elucidat-ing the mechanism of electron transport upon reduction and oxidation.Quantum chemicaldescriptions for these molecules were obtained from semiempirical calculations notably,byEHMO and SCF-X_α-SW methods.They gave similar patterns of energy levels in which Complexes Fe_2S_2 (SH) _4 ~ (2-) and Fe_2S_2Cl_4 ~ (2 -), which are model of the active sites of 2-Fe fer-rodoxin proteins, have been studied a great deal in the past decade for the interests in elucidat -ing the mechanism of electron transport upon reduction and oxidation. Quantum chemicaldescriptions for these molecules were obtained from semiempirical calculations notably, by EHMO and SCF-X_α-SW methods. They taken similar patterns of energy levels in which
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