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Effects of Core andor Peripheral Protonation of meso-Tetra(2-, 3-, and 4-pyridyl)Porphyrin and meso-Tetra(3-methylpyridyl)Porphyrin on Their UV-vis Spectra
Joint Authors
Rahiminezhad, Hajar
Mokary Yazdeli, Tahereh
Ghanbelanie Mojarrad, Aida
Zakavi, Saeed
Alizadeh, Robabeh
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-10-15
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
Core and/or peripheral protonation of meso-tetra(pyridyl)porphyrins, H2(py)P, with weak and strong acids have been studied by UV-vis spectroscopy.
The results support the proposal that the position of the Soret as well as the Q(0,0) bands of the dications is influenced by π donation from the meso substituents to the porphyrin core.
The red shift of the Q(0,0) band of H2t(py)P dications with 2-, 3-, and 4-pyridyl substituents does not correlate with the order of π electron donor ability of the meso groups.
The decreased electron donation from the central nitrogen atoms to the acids on going from 3-pyridyl group to 4- and 2-pyridyl ones has been used to explain this observation.
In spite of the negative effect of N-methylation of pyridyl substituents on the basicity of the central nitrogen atoms of meso-tetra(3-methylpyridyl)porphyrin, H2t(3-Mepy)P, protonation of H2t(3-Mepy)P occurs with weak and strong acids.
The blue shift of the Q(0,0) bands upon protonation of H2t(3-Mepy)P with weak and strong acids clearly shows the importance of resonance interactions between the π-systems of porphyrin and the aryl substituents on the position of the band.
American Psychological Association (APA)
Zakavi, Saeed& Rahiminezhad, Hajar& Ghanbelanie Mojarrad, Aida& Mokary Yazdeli, Tahereh& Alizadeh, Robabeh. 2012. Effects of Core andor Peripheral Protonation of meso-Tetra(2-, 3-, and 4-pyridyl)Porphyrin and meso-Tetra(3-methylpyridyl)Porphyrin on Their UV-vis Spectra. Journal of Spectroscopy،Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-492656
Modern Language Association (MLA)
Zakavi, Saeed…[et al.]. Effects of Core andor Peripheral Protonation of meso-Tetra(2-, 3-, and 4-pyridyl)Porphyrin and meso-Tetra(3-methylpyridyl)Porphyrin on Their UV-vis Spectra. Journal of Spectroscopy No. 2013 (2013), pp.1-7.
https://search.emarefa.net/detail/BIM-492656
American Medical Association (AMA)
Zakavi, Saeed& Rahiminezhad, Hajar& Ghanbelanie Mojarrad, Aida& Mokary Yazdeli, Tahereh& Alizadeh, Robabeh. Effects of Core andor Peripheral Protonation of meso-Tetra(2-, 3-, and 4-pyridyl)Porphyrin and meso-Tetra(3-methylpyridyl)Porphyrin on Their UV-vis Spectra. Journal of Spectroscopy. 2012. Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-492656
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-492656