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Issue 7, 2011
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Aggregation of an anionic porphyrin with chiral metal complexes and the competitive binding influences of a surfactant and a polyelectrolyte

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Abstract

The non-covalent interactions of chiral metal complexes with the achiral 5,10,15,20-tetrakis (4-sulonatophenyl) porphyrin (H4TTPS2) have been investigated by UV-vis and circular dichroism (CD) spectra. The results show that under acidic environments, only the chiral complex cations ([CoBr(NH3)(en)2]+, [Co(en)3]3+, [Ru(phen)3]2+) could interact with H4TTPS2 to form chiral aggregates, accompanied with the metal-centered chirality information transferred to the formed J-aggregates. However, the chiral complex anion ([Co(edta)]) does not cause the self-assembly process. The competitive binding interactions between an achiral water-soluble cationic surfactant (N-hexadecyltrimethyl ammonium chloride, CTAC) and a cationic polyelectrolyte (polyallylamine, PAA) with the chiral metal complex H4TTPS2 J-aggregates, respectively, were also investigated. It was found that chiral-symmetry-breaking phenomena occur in the cationic surfactant induced event. In the case of a cationic polyelectrolyte, it could change the conformational flexibility of the H4TTPS2 aggregates. These results may lead us to understand the possible mechanism of the supramolecular self-assembly process by the non-covalent interactions.

Graphical abstract: Aggregation of an anionic porphyrin with chiral metal complexes and the competitive binding influences of a surfactant and a polyelectrolyte

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Publication details

The article was received on 02 Mar 2011, accepted on 18 Mar 2011 and first published on 13 Apr 2011


Article type: Paper
DOI: 10.1039/C1NJ20193J
New J. Chem., 2011,35, 1424-1432

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    Aggregation of an anionic porphyrin with chiral metal complexes and the competitive binding influences of a surfactant and a polyelectrolyte

    J. Wang, C. Liu, D. Ding, L. Zeng, Q. Cao, H. Zhang, H. Zhao, X. Li, K. Xiang, Y. He and G. Wang, New J. Chem., 2011, 35, 1424
    DOI: 10.1039/C1NJ20193J

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