Abstract
The spin-coupling model of the {[Fe4S4]-Fe} center of the active site of sulfite reductase, which includes the Heisenberg exchange and double-exchange interactions, explains the peculiarities of the induced paramagnetism. The effective hyperfine constants of the SiR–1-NO complex are explained in the model with maximal pair spins S12=S34=9/2 in the ground state formed by strong double exchange.
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