Chromogenic Chemosensor Research Articles

Highly selective chromogenic signaling of Hg2+ in aqueous media at nanomolar levels employing a squaraine-based reporter.

A chromogenic chemosensor for Hg(2+) detection in aqueous media at the nanomolar level has been developed from squaraine scaffoldings.

1,3,5-Triaryl-2-penten-1,5-dione anchored to insoluble supports as heterogeneous chromogenic chemosensor

N-Allyl substituted 1,5-diphenyl-3-(4- N-methylaminophenyl)-2-penten-1,5-dione ( 1a ) has been immobilized on a polystyrene backbone, on the surface of mercaptopropyl-functionalized silica or inside the cavities of zeolite NaY. These solids either in suspension or in films act as chemosensors of Fe 3+ and other strong Lewis acid metal ions such as Cu 2+ and Pb 2+ in buffered water or ethanol. Brönsted acids in low pH aqueous solutions also produce the response of the sensor. For sensing of Fe 3+, depending on the loading of 1a (typically from 2.5 to 0.5 wt%) the solids can test from 10 −2 to 10 −4 M aqueous solutions. The time response can vary from tens of minutes to below a minute depending on hydrophilic/hydrophobic nature of the support and also on the 1a loading. The solid sensor was reused up to 10 times by regenerating after every use the initial form with NaAcO treatment.

A new fluorescent as well as chromogenic chemosensor for anions based on an anthracene carbamate derivative

A new fluorescent as well as chromogenic anion sensor, 1,8-anthradiol bis( N-phenylcarbamate) 2 , was synthesized. It exhibits new selective red-shifted absorption and fluorescence bands with F − and AcO −, which could be attributed to the anthracene moiety directly involved in the bonding interaction with the anions.

Fluorogenic and Chromogenic Chemosensors and Reagents for Anions

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Fluorogenic and chromogenic chemosensors and reagents for anions.

Fluorogenic and chromogenic chemosensors and reagents for anions.

A new fluoride selective fluorescent as well as chromogenic chemosensor containing a naphthalene urea derivative.

A new naphthalene derivative containing a urea group at the 1,8-position of naphthalene was synthesized and showed a unique absorption and fluorescence peak with a fluoride ion. Calculations suggested that a new peak was attributed to the increased anion character of urea nitrogen due to the strong interaction of the fluoride and N-H protons.