Table 2.

Optimization of the Reaction Conditions^a

entry	solvents	CH2Br2	indole	2ab	time (h)
1	CH2Cl2/pentane (1:1 v/v)		31	trace	24
2	CH2Cl2/pentane (1:1 v/v)	50 μL	26	5	24
3	CH2Cl2/pentane (1:1 v/v)	100 μL	22	~10	24
4	CH2Cl2/pentane (1:1 v/v)	200 μL	20	~10	4
5	pentane	100 μL	10	43	4
6	CH3CN/pentane (1:1 v/v)	100 μL	5	63	6
7c	CH2Br2 only	2 mL		41	8
8	CH3CN only	100 μL	7	53	6
9d	CH3CN/pentane (1:1 v/v)	100 μL			6
10e	CH3CN/pentane (1:1 v/v)	100 μL		79	6

^aReaction conditions: 1a (0.05 mmol), CsPbBr₃ NCs (1 mg), open to air, 500 μL of solvents, irradiation with a blue 456 nm LED at room temperature.

^bIsolated yield.

^cMultiple bromination side products observed.

^dNo photocatalyst added.

^eIndole as the starting material, under an air-free condition.