Table 2. Effect of the QH-240 Amount as a Catalyst on the Reduction Efficiency of 4-NP^a.

entry	catalyst dosage (mg)	4-NP conversion (%)	reduction time (min)b	4-AP yield (%)c
1	0	0	1 week	0
2	0.05	75	60	53.1
3	0.1	87	15	78.8
4	0.2	98.3	6	89.5
5	0.5	99.5	4	92.1
6	1.0	99.8	3	93.4

^aExperimental conditions: [4-NP] = 0.05 mM, [NaBH₄] = 10 mM, and T = 25 °C.

^bReduction time = time after subtraction of induction time for each catalytic run.

^cThe concentration changes of 4-AP obtained from the absorption changes in λ_max = 300 nm.