fulltext.study @t Gmail

Spectroscopic probing of acid–base properties and photocharacterization of phthalocyanines in organic solvents and polymer matrices

Paper ID Volume ID Publish Year Pages File Format Full-Text
28279 44067 2009 9 PDF Available
Title
Spectroscopic probing of acid–base properties and photocharacterization of phthalocyanines in organic solvents and polymer matrices
Abstract

This work reveals spectral characterization of newly synthesized metal-free (Pc-1) and Zn(II) (Pc-2) phthalocyanines (Pcs) in conventional solvents and two solid matrices; ethyl cellulose (EC) and polyvinyl chloride (PVC). Fluorescence lifetime (τF) and fluorescence quantum yield values (ϕF) of the Pcs were calculated in tetrahydrofuran (THF), dimethylsulfoxide (DMSO) and solid matrices of EC and PVC. The respective protolytic forms were characterized by absorption and emission spectra as well as apparent pKa values. The immobilized metal-free phthalocyanine exhibited strong and pH-dependent fluorescence due to a protolytic equilibrium within a large pH range yielding three different pKa values. The Zn-II phthalocyanine also exhibited optical emission based response to proton in the pH range of 2.0–9.0. Upon exposure to proton, reversible relative signal changes for PVC-doped Pc-1 and Pc-2 were approximately 90 and 95%, respectively. Presence of polyvalent metal ions in test medium did not restrict the proton sensing ability of the dyes.

Keywords
Luminescent pH probe; Phthalocyanine; NIR dye; Fluorescent pH indicator
First Page Preview
Spectroscopic probing of acid–base properties and photocharacterization of phthalocyanines in organic solvents and polymer matrices
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 202, Issues 2–3, 25 February 2009, Pages 205–213
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us