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1 2002

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Spectroscopic studies on the inclusion complexes of etrakis(2-hydroxy-5-nitrophenyl)porphyrin with a-cyclodextrin in solution and in sol-gel matrix

Ribeiro A. O., Neri C. R., Iamamoto Y., Serra O. A.

Materials Science

2002

Vol. 20, No. 1

21-27

Tetrakis(2-hydroxy-5-nitrophenyl)porphyrin included in A-cyclodextrin (A-CD) photophysics was studied in aqueous media, in solid state and entrapped in a sol-gel matrix. The equilibrium constant of the pair porphyrin/A-CD was evaluated as 1.22x105 mol-1xdm-3. The nitroporphyrin was reduced to aminoporphyrin, included into the A-CD and then entrapped in the Si-O matrix network. The tetrakisporphyrin maintained its luminescent properties (with emission bands at 658 and 713 nm, excited at 422 nm) in all environments, indicating a structural stability under the experimental conditions.