Table 2. Photoreduction of CO₂: Results of Photocatalytic CO₂ Reduction Experiments^a.

entry	PS	[CoTCPc] (μM)	n(CO) (μmol)	n(H2) (μmol)	TON(CO)b	TON’(CO)c	CO%	Φ5 min
1	CuBCP	50.0	85.5 ± 5.3	1.33 ± 0.39	428 ± 26	42.8 ± 2.6	98.5	40 ± 5%
2	CuPBCP	50.0	1.10 ± 0.15	0.38 ± 0.13	5.50 ± 0.75	0.55 ± 0.08	74.3	0.5 ± 0.2%
3	CuPPBCP	50.0	140 ± 7	1.95 ± 0.31	700 ± 33	70.0 ± 3.3	98.6	76 ± 6%
4	IrBPY	50.0	78.4 ± 5.7	1.13 ± 0.20	392 ± 28	39.2 ± 2.8	98.6	30 ± 4%
5	CuPPBCP	5.00	38.1 ± 5.0	2.48 ± 0.44	1910 ± 250	19.1 ± 2.5	93.9	45 ± 4%
6	CuPPBCP	0.500	23.6 ± 2.8	1.70 ± 0.24	11 800 ± 1400	11.8 ± 1.4	93.2	9.7 ± 2.2%

^aStandard condition: PS (0.5 mM), xantphos ligand (1.0 mM), phenol (5.0 v%), and BIH (50 mM) in 4 mL CH₃CN/TEA (v:v = 5:1) within 3 h of 425 nm irradiation (20 mW cm^–2) under 1 atm CO₂. The errors represent the standard deviations of three independent measurements.

^bCalculated for the TON values based on the catalyst amount (0.4 μmol).

^cCalculated for the TON values based on the PS amount (4.0 μmol).