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SPECTRAL AND PHOTOCHEMICAL BEHAVIOR OF NEWLY SYNTHESIZED 2,2'-DIPYRIDYLAMINE COMPLEXES OF PT(II) AND PD(II) WITH VARIOUS DIOXOLENES

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Title SPECTRAL AND PHOTOCHEMICAL BEHAVIOR OF NEWLY SYNTHESIZED 2,2'-DIPYRIDYLAMINE COMPLEXES OF PT(II) AND PD(II) WITH VARIOUS DIOXOLENES
 
Creator ANBALAGAN, V
SRIVASTAVA, TS
 
Subject transition-metal complexes
alpha-diimine complexes
singlet oxygen
platinum(ii) complexes
palladium(ii)
photosensitizers
o-1(2)
1,10-phenanthroline
luminescence
generation
 
Description Eight new complexes of the formula [M(X-X)(DPA)] (where M = Pd(II) or Pt(II), DPA is 2,2'-dipyridylamine and X-X are various dianions of catechol (CAT) and its derivatives, such as 4-methylcatechol (MCAT), 4-tertbutylcatechol (TBCAT), 3,4-dihydroxybenzoic acid (DHBA) and 3,4-dihydroxybenzaldehyde (DHB)) were synthesized and characterized. The absorption spectra and electrochemistry of these complexes are discussed. The complexes were found to sensitize the oxidation of 2,2,6,6-tetramethyl-4-piperidinol in N,N-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 the complexes to photosensitize the above photo-oxidation reaction follows the order: [Pt(DHBA)(DPA)] > [Pt(DHB)(DPA)] > [Pt(CAT)(DPA)] >> [Pd(CAT)(DPA)] > [Pd(DHBA)(DPA)] > [Pd(MCAT)(DPA)] > [Pd(TBCAT)(DPA)] > [Pd(DHB)(DPA)]. This order depends on the nature of the metal ion, the nature of the mixed ligands in the complexes and the distorted square planar geometry of the complexes.
 
Publisher ELSEVIER SCIENCE SA LAUSANNE
 
Date 2011-07-29T13:15:41Z
2011-12-26T12:48:43Z
2011-12-27T05:50:59Z
2011-07-29T13:15:41Z
2011-12-26T12:48:43Z
2011-12-27T05:50:59Z
1994
 
Type Article
 
Identifier JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 77(2-3), 141-148
1010-6030
http://dx.doi.org/10.1016/1010-6030(94)80037-5
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7724
http://hdl.handle.net/10054/7724
 
Language en