fulltext.study @t Gmail

Preparation and optical properties of organic nanoparticles of porphyrin without self-aggregation

Paper ID Volume ID Publish Year Pages File Format Full-Text
29299 44147 2007 8 PDF Available
Title
Preparation and optical properties of organic nanoparticles of porphyrin without self-aggregation
Abstract

We report the synthesis and optical properties of organic porphyrin nanoparticles with narrow size distribution and well dispersibility. Ion association between cationic meso-tetrakis(1-methylpyridinium-4-yl) porphine (TMPyP) and tetraphenylborate (TPB) anion or fluorinated derivatives of TPB, in the presence of polyvinylpyrrolidone (PVP), produces the porphyrin nanoparticles of ∼25 nm in aqueous solution. The TMPyP nanoparticles were stable in solution without precipitation for at least 30 days. No self-aggregation of the constituent porphyrin chromophores was confirmed. The TMPyP nanoparticles exhibited interesting optical properties; a large bathochromic shift in the absorption spectra and a resolution increase in the fluorescence spectra compared to those for the solution-phase TMPyP. A flattening of TMPyP molecules within the nanoparticles, which is caused by the twisting of four cationic methylpyridinium moieties, is the main origin for the large red shift. The resolution increase of fluorescence is due to the effect of immobilization of the methylpyridinium groups in the solid-state nanoparticles and/or that of a low polarity environment.

Keywords
Porphyrin nanoparticles; Ion association; Optical properties; Porphyrin flattening
First Page Preview
Preparation and optical properties of organic nanoparticles of porphyrin without self-aggregation
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 189, Issue 1, 10 June 2007, Pages 7–14
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