Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
Istituto di Biostrutture e Bioimmagini-Sezione di Catania, CNR, Viale A. Doria 6, 95125 Catania, Italy
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The pKa 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%The threshold to observe an ICD is about 1 × 10-4 M
lower concentrations are not effective in inducing the formation of the chiral aggregatesThe 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 hypochromicityPhe was removed from the solution at pH 2.3, using Centricon filters (cut-off = 10 kDa), replacing the eluted solution with aqueous solution at pH 2.3. The residual concentration was checked by fluorescence. The lower detection limit for protonated Phe is about 1 × 10-6 M. After the disappearance of Phe emission, we performed four additional filtration stepsNo ICD is observed for the achiral aggregates when cycling between pH 2 and 12The 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 variationUR - http://www.scopus.com/inward/record.url?eid=2-s2.0-34447129729&partnerID=40&md5=2becae2db9fbbaf16f8b975877d077ad
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Rivera, J. M., Craig, S. L., Martin, T., Rebek Jr., J., (2000) Angew. Chem., Int. Ed, 39, pp. 2130-2132
Switching off and on the supramolecular chiral memory in porphyrin assemblies
Kállay C, Dávid A, Timári S, Nagy EM, Sanna D, Garribba E, Micera G, De Bona P, Pappalardo G, Rizzarelli E, Sóvágó I * Copper(II) complexes of rat amylin fragments(360 views) Dalton T (ISSN: 1477-9234, 1477-9226, 1477-9234electronic), 2011 Oct 14; 40(38): 9711-9721. Impact Factor:3.838 ViewExport to BibTeXExport to EndNote