Table 2. Photocatalytic Performances of fac-[Re(4,4′-X₂-bpy)(CO)₃(PR₃)]⁺ Complexes and Their First Reduction Potentials.

fac-[Re(4,4′-X2-bpy)(CO)3(PR3)]+
X	R	ΦCOa	TONCOa	E1/2redb/V
Me	OEt	0.18	4.1	–1.55
H	OiPr	0.20	6.2	–1.44
H	OEt	0.16	5.9	–1.43
H	OMe	0.17	5.5	–1.41
H	Et	0.024	0.83	–1.39
H	nBu	0.013	0.65	–1.39
CF3	OEt	0.005	0.10	–1.03

^aA DMF-TEOA (5:1 v/v, 4 mL) solution of the complex (2.6 mM) was irradiated at 365 nm under CO₂ atmosphere.

^bRedox potentials measured in MeCN containing 0.1 M ⁿBu₄NClO₄ using Ag/AgNO₃ (10 mM) as a reference electrode.