Some mixed-ligand palladium(II) complexes and comparison of their photosensitizing ability with analogous platinum(II) complexes |
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Authors: | K.H. Puthraya T.S. Srivastava |
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Affiliation: | Department of Chemistry, Indian Institute of Technology, Powai, Bombay 400 076, India |
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Abstract: | Three new palladium(II) complexes of formula [Pd(bipy)(XX)] [where bipy is 2,2′-bipyridine and XX are dianions of catechol (CAT), 4-tert-butylcatechol (BCAT) and 3,4-dimercaptotoluene (DMT)] have been prepared and characterized by physical methods. A ligand-ligand charge-transfer band in each complex was observed between 16–21 kK (εmax = 1500–2200 1 mol?1 cm?1) which is negatively solvochromic. These palladium(II) complexes in dimethylformamide photosensitize the formation of singlet oxygen and their ability to photosensitize triplet oxygen (3O2) to singlet oxygen (1O2) are compared with analogous platinum(II) complexes. In addition, 2,2′-bipyridine-platinum(II) complex of 3,4-dimercaptotoluene also undergoes self-sensitized photooxidation. |
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Keywords: | Author to whom correspondence should be addressed. |
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