Structural, electrochemical and photochemical investigation of the water-soluble tin(IV) tetrakis(2-N-hydroxyethyl-4-pyridinium)porphyrin photocatalyst

Luuk L. C. Olijve; Ethan N. W. How; Mohan Bhadbhade; Shiva Prasad; Stephen B. Colbran; Chuan Zhao; Pall Thordarson

doi:10.1142/s1088424611004312

journal article Nov 01, 2011

Structural, electrochemical and photochemical investigation of the water-soluble tin(IV) tetrakis(2-N-hydroxyethyl-4-pyridinium)porphyrin photocatalyst

Luuk L. C. Olijve Ethan N. W. How Mohan Bhadbhade Shiva Prasad Stephen B. Colbran Chuan Zhao

Pall Thordarson

Journal of Porphyrins and Phthalocyanines Vol. 15 No. 11n12 pp. 1345-1353 · World Scientific Pub Co Pte Lt

View at Publisher Save 10.1142/s1088424611004312

Abstract

The water-soluble tin(IV) tetrakis(2-N-hydroxyethyl-4-pyridinium)porphyrin 1 photocatalyst was synthesized in good yield and its structure determined by single crystal X-ray crystallography. Electrochemical measurements on tin(IV) porphyrin 1 reveal a range of complex redox processes that are highly dependent on the pH and electrode used. The cathodic processes at ca. -0.6 to -0.8 V were assigned to electrochemical processes on the pyridyl moiety following differential pulse voltammetry and spectroelectrochemical investigation into the electrochemical properties of tin(IV) porphyrin. Photocatalytic experiment on tin(IV) porphyrin 1 under anaerobic conditions using triethanolamine (TEAO) as a sacrifical donor reveal a phlorin species as the main product which rapidly disappears upon exposure to oxygen. These results suggest that tin(IV) porphyrin π-radical anion is perhaps not the species responsible for the apparent ability tin(IV) porphyrins to photocatalytically reduce various substrates, including water to hydrogen.

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Details

Published: Nov 01, 2011
Vol/Issue: 15(11n12)
Pages: 1345-1353

Authors

L

Luuk L. C. Olijve