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Comparison of aggregation properties and photodynamic activity of phthalocyanines and azaphthalocyanines

Paper ID Volume ID Publish Year Pages File Format Full-Text
28777 44091 2006 10 PDF Available
Title
Comparison of aggregation properties and photodynamic activity of phthalocyanines and azaphthalocyanines
Abstract

Phthalocyanines (Pc) and their aza-analogues azaphthalocyanines (AzaPc) (tetrapyrazinoporphyrazines) with eight n-octylsulfanyl or tert-butylsulfanyl peripheral substituents and different central metals (Mg, Zn, metal-free) were synthesized. Dimerization constants Kd and absorption spectra of pure monomeric and dimeric magnesium complexes in toluene were calculated using series of absorbances at different concentrations. The bulky tert-butylsulfanyl substituents were found to be much better inhibitors of aggregation than long alkyl chains. Also Pc are less aggregated in organic solvents then AzaPc, short explanation is given. Singlet oxygen production of Pc and AzaPc was compared using dye-sensitized photooxidation of 1,3-diphenylisobenzofuran in pyridine. Both Pc and AzaPc showed similar activity not dependent on type of peripheral substitution. Zinc complexes of both Pc and AzaPc exceeded the magnesium ones and metal-free dyes in singlet oxygen production approximately twice.

Keywords
Phthalocyanine; Azaphthalocyanine; Dimerization; Singlet oxygen; Aggregation
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Comparison of aggregation properties and photodynamic activity of phthalocyanines and azaphthalocyanines
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 178, Issue 1, 20 February 2006, Pages 16–25
Authors
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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
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