Fluorescent agents play an important
role in the peroxyoxalate
chemiluminescence system. However, the effect of different frameworks
on chemiluminescence (CL) has not been explored. Herein two pyrene-based
metal–organic frameworks (MOFs), [Pb2L]
n
·2nDMA·2nH2O (1) and [(Ca2L)·(DMF)3]
n
·2.5nDMF·6nH2O (2) (H4L = 5,5′-(-pyrene-1,6-diyl)-diisophthalic
acid; DMA = N,N′-dimethylacetamide;
DMF = N,N′-dimethylformamide),
have been successfully synthesized and are applied to CL. They both
exhibit strong and lasting emission that is visible to the naked eye
and is significantly stronger than that of the ligand. More importantly,
compared with 2, 1 has notably better CL
performance. We infer that the reason may be that 1 has
higher stability and larger open channels, which can avoid the aggregation
of organic ligands as well as provide an effective pathway for the
active substance to diffuse into the channels.