Remarkable accelerating and decelerating effects of the bases on CO2 reduction using a ruthenium NADH model complex

• We report the organic hydride transfer reaction converting CO2 to HCO2–.
• The NADH-type complex shows CO2 reduction ability by the association of the bases.
• The drastic differences in the CO2 reduction rates are observed by changing the bases.
• The base adduct is the key compound in the CO2 reduction.
• Full characterization of the base adduct is reported.

Successful control over the rate of the organic hydride transfer reaction converting carbon dioxide to formate using a ruthenium NADH model complex, [Ru(bpy)2(pbnHH)](PF6)2 (bpy = 2,2′-bipyridine, pbnHH = 2-(pyridin-2-yl)-5,10-dihydrobenzo[b][1,5]naphthyridine) has been accomplished by the tuning of the basicity of the bases. The base adduct being found to be the key compound in the carbon dioxide reduction has been fully characterized through various physicochemical methods.

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