Abstract
Optical chemosensors and ionochromic cellulosic papers based on oxazolidine chromophores were developed for selective photosensing of metal ions and information encryption as security tags, respectively. The oxazolidine molecules have been displayed highly intense fluorescent emission and coloration characteristics that are usable in sensing and anticounterfeiting applications. Obtained results indicated that oxazolidine molecules can be used for selective detection of pb2+ (0.01 M), and photosensing of Fe3+, Co2+ and Ag+ metal ion solutions by colorimetric and fluorometric mechanisms with higher intensity and sensitivity. Also, oxazolidine derivatives were coated on cellulosic papers via layer-by-layer method to prepare ionochromic papers. Prepared ionochromic papers were used for printing and handwriting of optical security tags by using of metal ion solutions as a new class of anticounterfeiting inks with dual-mode fluorometric and colorimetric securities. The ionochromic cellulosic papers can be used for photodetection of metal ions in a fast and facile manner that presence of metal ions is detectable by naked eyes. Also, key-lock anticounterfeiting technology based on ionochromic papers and metal ion solution as ink is the most significant strategy for encryption of information to optical tags with higher security.
Highlights
Optical chemosensors and ionochromic cellulosic papers based on oxazolidine chromophores were developed for selective photosensing of metal ions and information encryption as security tags, respectively
Compared to the other stimuli-chromic materials, chemical structure of the oxazolidine derivatives is very sensitive to characteristics of the surrounding media, where coloration and fluorescence emission could be significantly affected by the solute–solvent interactions
O X1-Anthracene and O X2-Anthracene derivatives were prepared with two indolenine salts and 9-anthraldehyde, and OX1-Nitro and OX2-Nitro were synthesized by using the same indolenine salts and 4-nitrobenzaldehyde
Summary
Optical chemosensors and ionochromic cellulosic papers based on oxazolidine chromophores were developed for selective photosensing of metal ions and information encryption as security tags, respectively. Optical properties of the oxazolidine derivatives upon various metal ions were studied by UV–vis and fluorescence spectroscopies to develop novel molecular colorimetric/fluorometric chemosensors.
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