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INVESTIGATION OF O-1(2) GENERATION BY WATER-SOLUBLE ALPHA-DIIMINE COMPLEXES OF PLATINUM(II) AND PALLADIUM(II) WITH 3,4-DIHYDROXYBENZOIC ACID AS PHOTOSENSITIZERS

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Title INVESTIGATION OF O-1(2) GENERATION BY WATER-SOLUBLE ALPHA-DIIMINE COMPLEXES OF PLATINUM(II) AND PALLADIUM(II) WITH 3,4-DIHYDROXYBENZOIC ACID AS PHOTOSENSITIZERS
 
Creator ANBALAGAN, V
SRIVASTAVA, TS
 
Subject singlet molecular-oxygen
mixed-ligand complexes
ruthenium(ii)
luminescence
porphyrins
yields
 
Description Eight complexes with the formula [M(N-N)(DHBA)] (where M=Pd(II) or Pt(II), N-N is 2,2'-bipyridine (BPY), 2,2'-biquinoline (BIQ), 1,10-phenanthroline (PHEN), 4,7-diphenyl-1,10-phenanthroline (DPP) and DHBA is 3,4-dihydroxybenzoic acid dianion) were found to photosensitize the oxidation of 2,2,6,6-tetramethyl-4-piperidinol (NH) in NN-dimethylformamide (DMF) to the nitroxide radical. This photo-oxidation reaction involves singlet molecular oxygen (O-1(2)) as an intermediate and its presence was confirmed by quenching studies using bis(diethyldithiocarbamato)nickel(II), a well known O-1(2) quencher. The ability of these complexes to photosensitize the above photo-oxidation reaction follows the order, [Pt(PHEN)(DHBA)] . H2O > [Pt(DPP)(DHBA)] . H2O > [Pt(BIQ)(DHBA)] > [Pd(PHEN)(DHBA)] > [Pt(BPY)(DHBA)] > [Pd(DPP)(DHBA)] > [Pd(BPY)(DHBA)] . CH3OH > [Pd(BIQ)(DHBA)]. This order depends on the metal ion, the nature of the alpha-diimine ligand and the geometry of the metal complex.
 
Publisher ELSEVIER SCIENCE SA LAUSANNE
 
Date 2011-07-29T08:47:17Z
2011-12-26T12:48:35Z
2011-12-27T05:45:58Z
2011-07-29T08:47:17Z
2011-12-26T12:48:35Z
2011-12-27T05:45:58Z
1992
 
Type Article
 
Identifier JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 66(3), 345-353
1010-6030
http://dx.doi.org/10.1016/1010-6030(92)80007-I
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7654
http://hdl.handle.net/10054/7654
 
Language en