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by filtration, washed with cold water, and dried over P4O10 in vacuo. The compound was recrystallized from cold dichloromethane-hexane; yield 80%. Anal. Caled for Na((C6H5)4As)Ru(C6H5C(S)N0)3.H20: C,

Hemerythrin from sipunculid marine worms consists of an octamer form (Mr 108000) present in the coelomic fluid, each subunit of which contains a binuclear Fe active site capable of binding a single 02 molecule.1-4 A monomer form is present in

Rate constants (25 "C) for the reduction of eight different singly substituted 4-carboxy-2,6dinitrophenyl (cdnp) horse heart cytochrome c derivatives, modified respectively at lysine 7, 13,25,27,60,72,86, and 87, and of one 2,4,6-trinitrophenyl (tnp) derivative modified at lysine 13, by the 2-and 2 + complexes [Fe(edta)l2-(edta = ethylenediaminetetra-acetate) and [Co(sep)]'+ (sep =