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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/1395

Title: Singlet molecular-oxygen quantum yield measurements of some porphyrins and metalloporphyrins
Authors: VENKATESAN, R
PERIASAMY, N
SRIVASTAVA, TS
Keywords: laser flash-photolysis
photosensitizers
therapy
Issue Date: 1992
Publisher: INDIAN ACADEMY SCIENCES
Citation: PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES,104(6)713-722
Abstract: Hematoporphyrin IX dimethyl ester (HPDME), tetraphenylporphyrin (TPP), tetra(4-methoxyphenyl)porphyrin (TMPP), tetra(3,4-dimethoxyphenyl)porphyrin (TDMPP), tetra(3,4,5-trimethoxyphenyl)porphyrin (TTMPP), tetraanthrylporphyrin (TAP) and tetraacridylporphyrin (TACP), and their Zn2+, SnX2(2+), Pd2+ and Pt2+ complexes have been prepared and characterized. The singlet molecular oxygen quantum yield (phi(DELTA)) values of the above porphyrins and their metal derivatives in N,N-dimethyl formamide (DMF) have been measured in the presence of 1, 3-diphenylisobenzofuran (DPBF) as O-1(2) acceptor using steady state technique after correcting for the intensity of light absorbed by the photosensitizers. The phi(DELTA) values for the free base porphyrins are usually around 0.60. Hematoporphyrin IX dimethyl ester and its metal derivatives follow the order: HPDME (phi(DELTA) = 0.60) > Zn HPDME (0.40) > PdHPDME (0.34) > Sn(OH)2HPDME (0.28) greater-than-or-equal-to PtHPDME (0.24). Zinc(II) complexes of tetraarylporpbyrins show about 65% efficiency in phi(DELTA) values are compared to the phi(DELTA) values of their corresponding free base porphyrins. These results can be explained on the basis of catalyzed intersystem crossing to the ground state. The phi(DELTA) values of the above free base porphyrins and their metal complexes in DMF in presence of DPBF using single-pulsed laser excitation technique follow similar trends.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/14571
http://hdl.handle.net/100/1395
ISSN: 0253-4134
Appears in Collections:Proceedings papers

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