Article
Acid-Base and Aggregation Behavior of Water Soluble N-confused Porphyrin
Journal of Porphyrins and Phthalocyanines
(2014)
Abstract
The acid-base and aggregation behavior of water soluble meso-tetrakis(p-sulfonato-phenyl)N-confused porphyrin was explored using UV-visible spectroscopy. Stepwise protonation events were observed in acidic media with pK4 = 5.8 and pK3 = 7.7, and spectroscopic evidence suggests the formation of polymeric aggregates at low pH. meso-tetrakis(p-sulfonatophenyl)N-confused porphyrin was found to obey Beer's Law in dimethylformamide and methanol over the concentration range of 10-4 to 10-6 M and at low concentration in water. Deviations in water at higher concentration were analyzed to determine KD values for aggregate formation in the presence and absence of salt and buffer.
Keywords
- porphyrin,
- acid-base properties,
- aggregation; pKa,
- spectroscopic investigation,
- anionic
Disciplines
Publication Date
2014
DOI
10.1142/S1088424613501125
Citation Information
Janet L. Shaw, Jonathan McMurry, Pooya Salehi and Alexander Stovall. "Acid-Base and Aggregation Behavior of Water Soluble N-confused Porphyrin" Journal of Porphyrins and Phthalocyanines Vol. 18 Iss. 3 (2014) ISSN: 1099-1409 Available at: http://works.bepress.com/jonathan_mcmurry/62/