Zn selective luminescent ‘off-on’ probes derived from diaryl oxadiazole and aza-15-crown-5 |
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Authors: | Sabir H Mashraqui Subramanian Sundaram AC Bhasikuttan |
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Institution: | a Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz-E, Mumbai 400098, Maharashtra, India b Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India |
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Abstract: | New photo-induced electron transfer (PET) probes OMOX and OBOX, carrying an additional binding site in the form of ‘oxadiazole nitrogen’ have been designed to evaluate binding interactions with biologically significant Li+, Na+, K+, Ca2+, Mg2+, and Zn2+ including environmentally toxic Ba2+ and Cd2+ using optical spectral techniques. While Li+, Na+, and K+ did not appreciably perturb either the absorption or emission spectra, Ba2+, Ca2+, Mg2+, Zn2+, and Cd2+ induced slight red shifts (2-8 nm) in the UV-visible spectra as well as pronounced chelation induced enhanced fluorescence (CHEF). Both OMOX and OBOX exhibited the highest CHEF in contact with the zinc ion, whereas Ba2+, Ca2+, Mg2+, and Cd2+ induced relatively less emission enhancements. OBOX, which is a poorer emitter (Φf=0.0062) than OMOX (Φf=0.015), showed highly promising 160-fold emission enhancement in the presence of Zn2+. Potential, therefore is available in OBOX to function as a selective luminescent ‘off-on’ sensor for Zn2+ in the presence of coordinatively competing Ba2+, Ca2+, Mg2+, and Cd2+ ions. |
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Keywords: | Diaryl oxadiazoles Synthesis Photo-induced electron transfer UV-visible Fluorescence Selective Zn2+ sensor |
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