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Supramolecular Chirality and Chiral Inversion of Tetraphenylsulfonato Porphyrin Assemblies on Optically Active Polylysine.
- Source :
-
Journal of Physical Chemistry B . Oct2009, Vol. 113 Issue 42, p14015-14020. 6p. - Publication Year :
- 2009
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Abstract
- The self-assembly and induced supramolecular chirality of a dianionic meso-tetraphenylsulfonato porphyrin (TPPS) on the optically active polylysine has been investigated. Our research has confirmed that in the presence of poly(l-lysine) (PLL) or poly(d-lysine) (PDL), TPPS could form both H and J aggregates and the exciton type Cotton effect was induced in the corresponding absorption bands of H and J-aggregates. We have further revealed that the induced chirality of the H-band always followed the chirality of PLL or PDL, while the sign of the exciton couplet in the J-band could be the same as or opposite to that of the H-band depending on the mixing sequence and the ratio of PLL or PDL to TPPS (P/Tratio). At a P/Tratio less than 4, both the J and H aggregates showed the same symbolic CD signal. At a P/Tratio larger than 4, the opposite sign of the exciton couplet was observed for H and J-bands when TPPS was added into PLL, while the same sign was obtained when PLL was added into TPPS. Interestingly, the J-band with the same sign as that of the H-band can be inverted into the opposite sign under heating. A mechanism relating to the dynamic and thermodynamic formation of the chiral aggregates in the presence of PLL or PDL was proposed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15206106
- Volume :
- 113
- Issue :
- 42
- Database :
- Academic Search Index
- Journal :
- Journal of Physical Chemistry B
- Publication Type :
- Academic Journal
- Accession number :
- 44837737
- Full Text :
- https://doi.org/10.1021/jp902870f