posted on 2022-05-11, 19:03authored bySayed
Ali Akbar Razavi, Ali Morsali, Maryam Piroozzadeh
Pore
decoration of metal–organic frameworks (MOFs) with
functional groups is a useful strategy to attain high selectivity
toward specific analytes, especially in the presence of interfering
molecules with similar structures and energy levels, through selective
host–guest interactions. In this work, we applied a dihydrotetrazine-decorated
MOF, TMU-34, with the formula [Zn(OBA)(H2DPT)0.5]n·DMF, where H2OBA is
4,4′-oxybis(benzoic acid) and H2DPT is 3,6-bis(pyridin-4-yl)-1,4-dihydro-1,2,4,5-tetrazine,
for the highly selective detection of phenolic NACs, especially TNP
(94% quenching efficiency, detection limit 8.1 × 10–6 M, KSV = 182663 mol L–1), in the presence of other substituted NACs especially −NH2-substituted NACs. Investigations reveal that the quenching
mechanism is dominated by photoinduced MOF-to-TNP electron transfer
through possible hydrogen-bonding interactions between the phenolic
hydroxyl group of TNP and dihydrotetrazine functions of TMU-34. Despite
extensive publications on the detection of TNP in the presence of
other NACs, the significance of this work will be elucidated if attention
is paid to the fact that TMU-34 is among the rare and highly selective
MOF-based TNP sensors in the presence of −NH2-substituted
NACs as the serious interferers.