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Kinetic Control of the Supramolecular Chirality of Porphyrin J‐Aggregates
Author(s) -
Sorrenti Alessandro,
ElHachemi Zoubir,
Arteaga Oriol,
Canillas Adolf,
Crusats Joaquim,
Ribo Josep M.
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201200881
Subject(s) - porphyrin , nucleation , j aggregate , polymerization , chemical physics , chemistry , aggregate (composite) , chirality (physics) , supramolecular chemistry , enantiomer , sign (mathematics) , mixing (physics) , photochemistry , crystallography , molecule , materials science , stereochemistry , nanotechnology , organic chemistry , physics , polymer , chiral symmetry , quantum mechanics , mathematical analysis , mathematics , crystal structure , quark , nambu–jona lasinio model
The aggregation of achiral sulfonatophenyl‐ and phenyl‐ meso ‐substituted diprotonated porphyrins to chiral J‐aggregates is a hierarchical noncovalent polymerization process preceded by a critical nucleation stage. This allows significant enantiomeric excesses by the formation of a few primary nuclei and the control of their growth by the effect that flows (imperfect mixing) have on the secondary nucleation of the J‐aggregate particles. In addition, the results strongly suggest that when only one species of aggregate predominates, the CD signals of the three excitonic bands in the visible region (around 420, 490, and 700 nm) show the same sign. Thus, differences on their relative sign would be due to the presence of different species.