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Cathodic potential-sweep IR spectroelectrochemistry at R2′ where starting [Re(3,3′-DHBPY-H+)(CO)3Cl]−(↓) undergoes 1e– reduction and ETC conversion to [Re(3,3′-DHBPY)(CO)3Cl]•– (*) and the subsequent reduction of the latter intermediate to [Re(3,3′-DHBPY-2H+)(CO)3]3– (↑). Conditions: an OTTLE cell, THF/Bu4NPF6, T = 298 K. The label ■ corresponds to an unassigned side product.
