Photocatalysis by tetraphenylporphyrin of the decomposition of chloroform.
Irradiation of solutions of tetraphenylporphyrin (H2TPP) in chloroform causes decomposition of the chloroform at UV wavelengths higher than those that decompose chloroform directly. The catalytic cycle involves photooxidation of the porphyrin followed by thermal reduction. Photocatalysis continues after H2TPP has been completely protonated by the HCl produced during decomposition, and the rate of HCl production accelerates as a second pathway, in which CCl3OOH oxidizes the porphyrin, becomes important.
Muñoz
Zulmarie
Z
Department of Chemistry, Santa Clara University, Santa Clara, CA 95053, USA.
Cohen
Allison S
AS
Nguyen
Linh M
LM
McIntosh
Ted A
TA
Hoggard
Patrick E
PE
D002384:Catalysis; D002725:Chloroform / Q000737:chemistry* / Q000528:radiation effects*; D005609:Free Radicals / Q000737:chemistry / Q000528:radiation effects; D006851:Hydrochloric Acid / Q000138:chemical synthesis; D007700:Kinetics; D010777:Photochemistry; D010782:Photolysis; D011166:Porphyrins / Q000737:chemistry* / Q000528:radiation effects*; D012996:Solutions / Q000737:chemistry; D013997:Time Factors; D014466:Ultraviolet Rays
D005609:Free Radicals; D011166:Porphyrins; D012996:Solutions; C409084:tetraphenylporphyrin; D002725:Chloroform; D006851:Hydrochloric Acid