Abstract
Two new Cu(II) chelate complexes, Cu(imepH) 2+ and Cu(bidH 2) 2+, have been prepared that contain a titratable pyrrole hydrogen of a coordinated imidazole moiety. The deprotonated species, Cu(imep) + and Cu(bidH) +, have been observed to form imidazolate-bridged complexes with Fe(TIM)(CH 3CN) 2 2+ in 60% CH 3CN:40% CH 3OH (V:V). The presence of binuclear complexes at equilibrium with the monomer species in this solvent is confirmed by the appearance of a new CT band (∼620 nm) and altered electron spin resistance (ESR) spectra for the Cu(II) chelates. The binuclear species are O 2 sensitive; the bridged complexes I = [Fe(TIM)(CH 3CN)(imep)Cu] 3+ and II = [Fe(TIM)(CH 3CN) (bidH)Cu] 3+ are discussed in terms of the Palmer model for the heme a 3-Cu(β) interaction in cytochrome oxidase.
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