Products of photocatalysis after irradiation for 3 h^a.

Entry	Absence	Product/μmol (TON)
		HCOOH	CO	H2
1	—	1.9 (19)	0.05	n.d.
2b	Os	0.04	n.d.	n.d.
3b	Ru(CO)	n.d.	n.d.	n.d.
4b	BI(OH)H	n.d.	n.d.	n.d.
5c	Light irradiation	n.d.	n.d.	n.d.
6d	CO2	n.d.	n.d.	n.d.

^aA CO₂-saturated DMA solution (2 mL) containing Os (50 μM), Ru(CO) (50 μM), and BI(OH)H (0.2 M) was irradiated with 725 nm light.

^bPhotocatalytic reactions were performed without Os, Ru(CO), or BI(OH)H.

^cThe solution was placed in the dark for 3 h.

^dAn Ar-saturated solution was used.