Fluorescence studies of some protonated cinchona alkaloids in polymers

• Published in: Journal of luminescence Vol. 131; no. 7; pp. 1550 - 1555
• Main Authors: Kumar Joshi, Neeraj, Rautela, Ranjana, Joshi, Hem Chandra, Pant, Sanjay
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2011; Elsevier
• Subjects: Alkaloids; Cinchonidine; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Decay; Doppler effect; Edge excitation red shift (EERS); Exact sciences and technology; Excitation; Luminescence; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics; Polymeric environment; Polymethyl methacrylates; Polyvinyl alcohols; Quinidine; Solid organic materials; Spectra; Cinchonidine; Edge excitation red shift (EERS); Quinidine; Polymeric environment; Fluorescence; Excited states; Spectral line shift; Time resolved spectra; Luminescence decay; PMMA; Excitation spectrum; PVA; Absorption spectra
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2011.02.015

In the present paper we report spectral and photophysical properties of two probes viz. cinchonidine and quinidine in two different polymers viz. polyvinyl alcohol (PVA) and polymethylmethacrylate (PMMA). The emission spectra exhibit edge excitation red shift (EERS) for both the probes and multiexponential decays are observed. Presence of various conformers and geometries is suggested to explain the observed results. The photophysical properties and excited state behavior of Cd++ are more sensitive towards the microenvironment of the polymer. ► We report photophysical properties of cinchonidine and quinidine in PMMA and PVA. ► The emission spectra exhibit edge excitation red shift and multiexponential decays. ► Presence of conformers and geometries is suggested to explain the observed results.