Switching off and on the supramolecular chiral memory in porphyrin assemblies

Journal of the American Chemical Society

Volumn 129, Issue 26, 2007, Pages 8062-8063

  Mammana, Angela ^a   D'Urso, Alessandro ^a   Lauceri, Rosaria ^b   Purrello, Roberto ^a  

^a UNIVERSITY OF CATANIA   (Italy)

^b CNR   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

COPPER COMPLEX; NITROGEN; PORPHYRIN DERIVATIVE;

ABSORPTION SPECTROSCOPY; ARTICLE; CHEMICAL STRUCTURE; CHIRALITY; CIRCULAR DICHROISM; COMPLEX FORMATION; KINETICS; PH; SUPRAMOLECULAR CHEMISTRY;

EID: 34447129729     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja071447b     Document Type: Article

References (23)

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18. a of the inner nitrogen atoms in tetra-cationic porphyrins is around 0. Therefore, at pH 2.3, the percentage of species protonated in the core is about 1%.
19. -4 M; lower concentrations are not effective in inducing the formation of the chiral aggregates.
20. The Soret band is the main feature in the visible region of the porphyrin absorption spectrum and is very sensitive to the aggregation state: porphyrin assembly causes broadening and hypochromicity.
21. -6 M. After the disappearance of Phe emission, we performed four additional filtration steps.
22. No ICD is observed for the achiral aggregates when cycling between pH 2 and 12.
23. The reassembly process is time dependent. The CD signal reappears 5 min after the pH-driven (from 9 to 2.3) aggregation and increases with time. The spectra reported in Figure 2 have been recorded for 10 min after the 9 → 2.3 pH variation.