pH modulation of porphyrins self-assembly onto polylysine

Journal of Physical Chemistry B

Volumn 102, Issue 44, 1998, Pages 8852-8857

  Purrello, Roberto ^a   Bellacchio, Emanuele ^a   Gurrieri, Sergio ^b   Lauceri, Rosaria ^a   Raudino, Antonio ^a   Scolaro, Luigi Monsù ^c   Santoro, Anna Maria ^a  

^a UNIVERSITY OF CATANIA   (Italy)

^b CNR   (Italy)

^c UNIVERSITY OF MESSINA   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000647732     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp9828686     Document Type: Article

References (44)

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31. 4TPPS = 434 nm).
32. 4TPPS = 434 nm).
33. 4TPPS = 434 nm).
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36. The observed CD features and their pH dependence are very similar for all the polylysine to porphyrin ratio investigated, the only difference being the pH at which the spectral variations start to happen. This is reasonable because, as anticipated, the behavior of these complex species vs the pH depends on R.
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38. This trend cannot be ascribed to a higher extent of porphyrins aggregation because the spectroflourimetric data show the opposite one, i.e., the concentration of aggregated porphyrins increases on increasing R values.
39. The shift of the inflection point, obsereved by varying R, cannot be simply related to a shift toward the right side of the equilibria I for concentration effects but rather reflects the variation in population distribution of aggregated porphyrins (dimers, trimers, ...) on varying the number of available binding sites.
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43. 2TPPS-polylysine system, the CD spectrum suggests the presence of two chiral species.
44. Raudino, A.; Gurrieri, S.; Lauceri, R.; Monsù Scolaro, L.; Purrello, R. Manuscript in preparation.