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Optics Letters

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  • Vol. 25, Iss. 5 — Mar. 1, 2000
  • pp: 323–325

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

A. G. Bezerra, Jr., I. E. Borissevitch, A. S. L. Gomes, and Cid B. de Araújo  »View Author Affiliations


Optics Letters, Vol. 25, Issue 5, pp. 323-325 (2000)
http://dx.doi.org/10.1364/OL.25.000323


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Abstract

We demonstrate the use of the Z-scan technique as a method to measure a chemical parameter, the pKa 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 pKa values in aqueous solutions, and showed excellent agreement.

© 2000 Optical Society of America

OCIS Codes
(160.4670) Materials : Optical materials
(160.4760) Materials : Optical properties
(190.3270) Nonlinear optics : Kerr effect
(190.4400) Nonlinear optics : Nonlinear optics, materials

Citation
A. G. Bezerra, Jr., I. E. Borissevitch, A. S. L. Gomes, and Cid B. de Araújo, "Exploitation of the Z-scan technique as a method to optically probe pKa in organic materials: application to porphyrin derivatives," Opt. Lett. 25, 323-325 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-5-323


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