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The highly efficient (>350 turnovers/h) catalytic reduction of water by zinc(II) metalloporphyrins has been observed in a defined ‘model system’ containing zinc porphyrin (10–5M), colloidal platinum (10–6M), methylviologen (10–3M), and ethylenediaminetetra-acetic acid or N-phenylglycine (10–2M), and a mechanism is proposed on the basis of the intermediates observed.
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McLendon et al. (1980) studied this question.
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