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Calix[5]phyrin for Fluoride Ion Sensing with Visible and Near Infrared Optical Responses
Author(s) -
Higashino Tomohiro,
Kumagai Atsushi,
Imahori Hiroshi
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201800856
Subject(s) - fluoride , ion , infrared , near infrared spectroscopy , visible spectrum , chromophore , optical sensing , materials science , interference (communication) , selectivity , chemistry , photochemistry , optoelectronics , inorganic chemistry , optics , organic chemistry , catalysis , computer science , telecommunications , physics , channel (broadcasting)
Fluoride (F − ) ion sensing is an important topic due to its roles in health, medical, and environmental sciences. In this regard, colorimetric sensors with a near infrared (NIR) optical response are useful in biological systems because they can avoid interference from endogenous chromophores. Although calix[ n ]phyrins are highly attractive as sensors with the NIR optical response, studies on calix[ n ]phyrins are still limited owing to their intrinsic instability against ambient light and air. In this study, we report the synthesis and characterization of a new calix[5]phyrin bearing one sp 3 ‐hybridized carbon atom as a π‐expanded calix[ n ]phyrin. Upon addition of tetrabutylammonium fluoride, the calix[5]phyrin exhibited distinct NIR absorptions at 908 and 1064 nm as well as a visible color change. Importantly, it revealed an excellent selectivity for F − ion. These results demonstrate that calix[5]phyrins are promising colorimetric and NIR sensors of F − ion.