Table 3. Photocatalytic formation of CO at 1 h or 15 h of irradiation and quantum yields of CO formation under irradiation at λ _ex = 436 nm or 405 nm ^a .

Entry	PS	n CO/μmol (TONCO) b		Φ CO c
		1 h	15 d h	λ ex b = 436 nm	λ ex e = 405 nm
1	R(4)	5.42 (27)	19.68 (98)	0.53	— f
2	R(5)	4.44 (22)	14.2 (71)	0.61	0.67
3 g	R(5)	1.28 (6)	1.52 (8)	— f
4	R(4·5)	3.95 (20)	6.31 (32)	0.60	0.61
5	R(OMe)	2.13 (11)	9.63 (48)	0.60	0.74
6	R(5)-e	6.37 (32)	6.72 (34)	0.53	— f
7	None	0 (0)	0.32 (1.6)	— f

^aPhotocatalytic CO₂ reduction using a DMF–TEOA mixture (5 : 1 v/v) containing R(X) (0.05 mM) as a PS and Re-ACN as the catalyst.

^bUnder λ _ex = 436 nm with 5.7 × 10^–9 einstein per s light intensity, [Re-ACN] = 0.05 mM.

^c± 2%.

^dLevel off.

^e1.3 × 10^–9 einstein per s light intensity, [Re-ACN] = 0.025 mM.

^fNot determined.

^gWithout Re-ACN.