Antiferromagnetic coupling, irons binuclear clusters

The determination of the exchange integral in binuclear iron-sulfur clusters of proteins of varying complexity has been carried out (Salerno et al, 1977). The well-established model for binuclear iron-sulfur clusters involves two acid-labile sulfur atoms bridging two antiferromagnetically coupled high-spin iron atoms. The values of J obtained are center SI in succinate dehydrogenase, 90 cm Rieske s iron-sulfur center, 65 cm" adrenodoxin, 270 cm The behavior of iron-sulfur center Nla in NADH UQ reductase was also examined Its similarity to that of center SI indicates that center Nla is also binuclear iron-sulfur center with J = 90 cm" The... 

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