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Exploitation of the Z-scan technique as a method to optically probe pK(a) in organic materials: application to porphyrin derivatives.

Authors
Type
Published Article
Journal
Optics letters
Publication Date
Volume
25
Issue
5
Pages
323–325
Identifiers
PMID: 18059868
Source
Medline

Abstract

We demonstrate the use of the Z-scan technique as a method to measure a chemical parameter, the pK(a) value, that characterizes the equilibrium constant in acid-base reactions. The measurements were performed with picosecond pulses at 532 nm in Fe(III)-meso-tetrakis(4-N-methyl-pyridyl) porphyrin. The results were compared with linear absorption measurements and electron paramagnetic resonance, the usual techniques employed to determine pK(a) values in aqueous solutions, and showed excellent agreement.

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