Chromogenic chemosensor

Metal ions play a quadruple role in fluorescent and chromogenic chemosensors they are the most common substrates some metal complexes are involved as receptors for anions and neutral molecules and some metal ions (of Ru, Re, Os, Eu, Tb) constitute fluorescent reporters. Furthermore, in some applications metal ions are structural elements of fluorescent chemosensors [7]. 

Martinez-Manez, R. and Sancenon, F. (2003) Fluorogenic and chromogenic chemosensors and reagents for anions. Chemical Reviews, 103, 4419-4476. 

The combination of dyes with microporous materials opens-up a way to develop selective chemosensors microporous zeolites with an anchored squaraine 27 (Fig. 13) and some other types of dyes can be used as chemosensors for the chromogenic discrimination of amines [75], These dye-zeolite hosts are expected to be promising sensor materials allowing the visible discrimination of selected target guests by size and/or polarity within families or closely related molecules. It was found that the response of the solid to amines was basically governed by the three-dimensional architecture of the solid material. 

Chromogenic and fluorogenic chemosensors and reagents for anions (2010-2011) 13CSR3489. 

It also demonstrated chromogenic behavior and turned from colorless to deep purple red, which allowed naked-eye detection of ions. A rhodamine derivative 32 [109] as well as salicylaldehyde fluorescein hydrazine 33 represents a Cu " "-selective fluorescent chemosensor [110]. 

---