Frequent use of antibiotics and the growth of industry
lead to
the pollution of several natural resources which is one of the major
consequences for fatality to human health. Exploration of smart sensing
materials is highly anticipated for ultrasensitive detection of those
hazardous organics. The robust porous hydrogen bonded network encompassing
a free-NH2 moiety, Zn(II)-based metal–organic framework
(MOF) (1), is used for the selective detection of antibiotics
and toxic oxo-anions at the ppb level. The framework is able to detect
the electronically dissimilar antibiotic sulfadiazine and nitrofurazone
via fluorescence “turn-on” and “turn-off”
processes, respectively. The antibiotic-triggered reversible fluoro-switching
phenomena (fluorescence “on–off–on”) are
also observed by using the fluorimetric method. An extensive theoretical
investigation was performed to establish the fluoro-switching response
of 1, triggered by a class of antibiotics and also the
sensing of oxo-anions. This investigation reveals that the interchange
of the HOMO–LUMO energy levels of fluorophore and analytes
is responsible for such a fluoro-switchable sensing activity. Sensor 1 showed the versatile detection ability which is reflected
by the detection of a carcinogenic nitro-group-containing drug “roxarsone”.
In view of the sustainable environment along with quick-responsive
merit of 1, an in situ MOF gel composite (1@CS; CS = corn starch) is prepared using 1 and CS due
to its useful potential features such as biocompatibility, toxicologically
innocuous, good flexibility, and low commercial price. The MOF composite
exhibited visual detection of the above analytes as well as antibiotic-triggered
reversible fluoro-switchable colorimetric “on–off–on”
response. Therefore, 1@CS represents a promising smart
sensing material for monitoring of the antibiotics and oxo-anions,
particularly appropriate for the real-field analysis of carcinogenic
drug molecule “roxarsone” in food specimens.
The highly luminescent complex [CdQ2(H2O)2] (1) showed ultra-selective and highly sensitive to explosive organo-toxin trinitro phenol (TNP). This detection is extremely fast with high quenching constant (5.3×104 M-1) and very...
Metal-organic Frameworks (MOFs) are the excellent candidates from chemist to material sciences/engineers for their interesting qualitative features and potential applications. Quite interestingly, the luminescence property of MOFs would be nicely...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.