Vibration and Fluorescence Spectra of Porphyrin-Cored 2,2-Bis(methylol)-propionic Acid Dendrimers.

Sensors
Boris Minaev, Mikael Lindgren

Abstract

Bis-MPA dendron-coated free-base tetraphenylporphyrin and zinc-tetraphenyl-porphyrin (TPPH(2) and TPPZn) were studied in comparison with simple porphyrins (H(2)P, ZnP) by theoretical simulation of their infrared, Raman and electronic absorption spectra, as well as fluorescense emission. Infrared and fluorescence spectra of the dendrimers were measured and interpreted along with time-resolved measurements of the fluorescence. The 0-1 emission band of the dendron substituted TPPZn was found to experience a "heavy substitution"-effect. The 0-1 vibronic emission signal is associated with a longer decay time (approx. 7 - 8 ns) than the 0-0 emission (approx. 1 - 1.5 ns). The former contributed with more relative emission yield for larger dendron substituents, in agreement with the appearance of steady-state emission spectra showing increased contribution from the 0-1 vibronic fluorescence band at 650 nm. No such substitution effect was observed in the electronic or vibrational spectra of the substituted free-base variant, TPPH(2). Vibration spectra of the parent porphyrins (H(2)P, ZnP, TPPH(2) and TPPZn) were calculated by density functional theory (DFT) using the B3LYP/6-31G** approximation and a detailed analysis of the most active...Continue Reading

References

Jan 1, 1992·Photochemistry and Photobiology·B W Henderson, T J Dougherty
Jan 1, 1973·Annals of the New York Academy of Sciences·J O AlbenW S Caughey
Oct 13, 2004·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Boris Minaev
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Aug 22, 2006·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Boris MinaevHans Agren

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Citations

Oct 18, 2013·Physical Chemistry Chemical Physics : PCCP·Justyna WójcikRoman Wrzalik
Feb 5, 2016·Photodiagnosis and Photodynamic Therapy·Vanya BogoevaOdrun A Gederaas
Jan 1, 2010·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Ying-Hui ZhangJin Wang
Mar 8, 2013·Macromolecular Rapid Communications·Katriann ArjaK Peter R Nilsson
Jun 20, 2015·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Odrun A GederaasMikael Lindgren
Jun 3, 2017·Chemistry of Materials : a Publication of the American Chemical Society·Kai TaoEhud Gazit

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Methods Mentioned

BETA
NMR
size-exclusion chromatography
fluorescence

Software Mentioned

IBH Data Station

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