Fluorescence emission studies of an azlactone derivative embedded in polymer films

A Fast-Response pH Optode Based on a Fluoroionophore Immobilized to a Mesoporous Silica Thin Film

“…19 The experimentally recorded response times are also faster than for optodes based on plasticized PVC as a substrate, which require up to minutes to establish an equilibrium. [20][21][22] On the other hand, optodes using a hydrogel matrix as the substrate show response times that are below 30 s; however, indicator leaching is clearly observed under continuous flow operation. 23 Finally, the present response times are shorter than in the case of our previously presented sensors 15,24 using porous silica glass (thickness: 1 mm) as the substrate, which required 5 min or longer until equilibrium.…”

Optical pH sensor based on spectral response of newly synthesized Schiff bases

“…An azlactone derivative embedded in plasticized PVC polymer film is used as a fully reversible pH sensor in the pH range of 1-7 [8]. Prussian blue; (C.I.…”

Fluorescence emission studies of 4-(2-furylmethylene)-2-phenyl-5-oxazolone embedded in polymer thin film and detection of Fe3+ ion

“…10 8 /n 2 max 3 max Dn 1/2 , where n max is the wavenumber in cm ÿ1 , 3 max , the molar absorption coefficient at the selected absorption wavelength, and Dn 1/2 , the half-width of the selected absorption in wavenumber units of cm ÿ1 [20].…”

“…In liquid state, the stability of the heterocyclic ring system of the molecule is not satisfactory and fluorescence quantum yields are low. When embedded in a proper polymeric matrix, these structures exhibit higher fluorescence emission and improved stability due to the enhanced molecular rigidity in immobilized phase [20].…”