posted on 2019-09-20, 19:37authored byKai Xing, Ruiqing Fan, Shuang Gai, Xubin Zheng, Ping Wang, Yulin Yang
Anthrax spores have
been a determining risk to human beings and
animals across the world. As such, the qualitative monitoring toward
dipicolinic acid (DPA), the unique biomarker of bacillus anthracis,
is highly desired and being moved forward in health management. Herein,
a breathing zeolite-like supramolecular assembly (ZSA), with the sra topology and 1D hexagon channel, is designed
by controlling the bridging angle of the ditopic ligand after systematic
analysis in topology. The solvent-dependent dynamic behavior is illustrated
by powder X-ray diffraction and reflected in tunable luminescent emission
based on solvent polarity parameters. According to the structural
result and theoretical analysis, Eu3+ is anchored within
the framework to form a ratiometric luminescent sensor successfully
because of the abundant potential active site. After DPA addition,
the resulting composite shows a sensitive and selective response in
the linear range of 0–7.0 μM stemmed from absorbance
energy-transfer emission and preferential coordination. The work we
presented here may enrich the sensing platforms containing lanthanides
and expand the potential application of ZSAs in clinical analysis.