Issue 5, 2007
From the journal:

Photochemical & Photobiological Sciences

Generation of reactive oxygen species by photolysis of the ruthenium(ii) complex Ru(NH3)5(pyrazine)2+ in oxygenated solution†

Roberto Santana da Silva,*abc   Mario Sergio P. Marchesi,a   Antonio Claudio Tedesco,c   Alexander Mikhailovskyb  and  Peter C. Ford*b  

* Corresponding authors

a Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café s/n, Ribeirão Preto, SP, Brazil

b Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA
E-mail: ford@chem.ucsb.edu

c Departamento de Química da Faculdade de Filosofia Ciencias e Letras de Ribeirão Preto, Av. dos Bandeirantes s/n, Ribeirão Preto, SP, Brazil
E-mail: silva@chem.ucsb.edu

Abstract

Metal-to-ligand charge transfer photolysis of the ruthenium(II) pyrazine complex Ru(NH3)5pz2+ (I) in pH 7.4 oxygenated phosphate buffer solution generates the Ru(III) analog Ru(NH3)5pz3+ plus the reactive oxygen species singlet oxygen and superoxide. Based on the very short MLCT lifetime (re-measured as ∼250 ps in D2O) of I* and the quantum yield for singlet oxygen formation (0.01 for aerated D2O) the rate constant for oxygen quenching of I* was calculated to be ∼(3 ± 1) × 1010 M−1 s−1.

Graphical abstract: Generation of reactive oxygen species by photolysis of the ruthenium(ii) complex Ru(NH3)5(pyrazine)2+ in oxygenated solution

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Article information

DOI
https://doi.org/10.1039/B617350K
Article type
Communication
Submitted
28 Nov 2006
Accepted
06 Mar 2007
First published
20 Mar 2007

Photochem. Photobiol. Sci., 2007,6, 515-518

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Generation of reactive oxygen species by photolysis of the ruthenium(II) complex Ru(NH3)5(pyrazine)2+ in oxygenated solution

R. S. da Silva, M. S. P. Marchesi, A. C. Tedesco, A. Mikhailovsky and P. C. Ford, Photochem. Photobiol. Sci., 2007, 6, 515 DOI: 10.1039/B617350K

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