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Spectral and photophysical properties of mono and dinuclear Pt(II) and Pd(II) complexes: An unusual emission behaviour

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Title Spectral and photophysical properties of mono and dinuclear Pt(II) and Pd(II) complexes: An unusual emission behaviour
 
Creator ANBALAGAN, V
SRIVASTAVA, TS
 
Subject alpha-diimine complexes
transition-metal complexes
mixed-ligand complexes
charge-transfer luminescence
excited-state properties
platinum(ii) complexes
electronic-spectra
3,4-dihydroxybenzoic acid
electrochemical-behavior
photochemical behavior
llct
luminescence
phosphorescence
pt(ii) and pd(ii)
 
Description Eight mononuclear complexes of the formula [M(N-N)(DHB)] and two binuclear complexes of the formula [M-2(BPY)(2)(THB)] {where M = Pd(II) or Pt(II), N-N = 2,2'-bipyridine (BPY), 2,2'-biquinoline (BIQ), 4,7-diphenyl-1,10-plienanthroline (DPP), 1, 10-phenanthroline (PHEN); DHB = dianion of 3,4-dihydroxybenzaldehyde and THB = tetraanion of 3,3',4,4'-tetrahydroxy benzaldazine} were prepared and their electrochemical, spectral and photophysical properties were examined. These complexes were characterized by chemical analysis, IR and proton NMR spectroscopy. A detailed study on the absorption spectroscopy of these complexes was made. These complexes were found to show a low-energy solvatochromic ligand-to-ligand charge-transfer (LLCT) band. The electronic energies of these bands have been analyzed and compared with electrochemical data. Emission behaviour of the complexes of the series, [Pt(N-N)(DHB)], [Pt(N-N)(DHBA)] {where DHBA is the dianion of 3,4-dihydroxybenzoic acid} and [Pt-2(BPY)(2)(THB)] was also investigated. These platinum complexes were found to emit from a low-energy state at low temperature and a high-energy state at room temperature. Photophysics of these complexes is also discussed. (C) 2004
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-26T14:22:13Z
2011-12-26T12:57:29Z
2011-12-27T05:42:00Z
2011-08-26T14:22:13Z
2011-12-26T12:57:29Z
2011-12-27T05:42:00Z
2004
 
Type Article
 
Identifier POLYHEDRON, 23(18), 3173-3183
0277-5387
http://dx.doi.org/10.1016/j.poly.2004.09.029
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11338
http://hdl.handle.net/10054/11338
 
Language en