The magnetic susceptibility of the oxidized and reduced iron-sulfur proteins adrenodoxin and putidaredoxin

Characterization of hyperfine‐shifted 1H resonances in oxidized and reduced putidaredoxin, an Fe2S2 ferredoxin from Pseudomonas putida

“…However, more data are required before a reliable estimate of the value of J can be made for Pdx. 27,28 One final observation might be made. The patterns of hyperfine shifts of all the Fe,S, ferredoxins studied so far, plant, bacterial and vertebrate, appear to be similar in the oxidized forms.…”

Oxygen Reduction by the P450 Monoxygenase Systems

“…antiferromagnetic exchange coupling temperature estimated to be at least 60% (52). In summary, Gibson's tetrahedral model with spin coupling provides a consistent explanation of the experimental results, but a more sophisticated model may be required to account for the precise details of covalency, exchange interaction, and the optical and redox transfer properties.…”

Magnetic properties of Cancer magister hemocyanin

“…Hemocyanin may be compared with other members of the rapidly growing class of biologically important polynuclear metal compounds in which association among the metals is so close that exchange coupling is verified or probable. In some members of this class, paramagnetism has been detected at high temperatures so that the strength of the exchange coupling could be measured (Palmer et al, 1971;Moss et al, 1972;Dawson et al, 1972); in others only a lower limit has been reported (Moss et al, 1969(Moss et al, , 1971Moleski et al, 1970). The very strong couplings (>200°K) seen in some iron-sulfur proteins have led to suggestions that there must be a direct metal-metal bond as well as superexchange through bridging sulfides (Lewis et al, 1972;Moleski et al, 1970).…”