Homogeneously mixed porphyrin J-aggregates with rod-shaped nanostructures viazwitterionic self-assembly

To tailor functional nanomaterials, the co-assembly of self-assembling dyes in a homogeneous way would be a promising approach because the electronic properties can be tuned by the mixing ratio. Although porphyrins are important supramolecular building blocks with unique optical properties, a homoge...

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Veröffentlicht in:Physical chemistry chemical physics : PCCP 2011-12, Vol.14 (3), p.1270-1276
Hauptverfasser: Arai, Yonbon, Tsuzuki, Kohei, Segawa, Hiroshi
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Sprache:eng
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Zusammenfassung:To tailor functional nanomaterials, the co-assembly of self-assembling dyes in a homogeneous way would be a promising approach because the electronic properties can be tuned by the mixing ratio. Although porphyrins are important supramolecular building blocks with unique optical properties, a homogeneously mixed J-aggregate system of porphyrins has not been reported yet. Herein, we focused on three kinds of zwitterionic porphyrin diacids, H sub(4)TSPP super(2-), H sub(4)T(5-STh)P super(2-) and H sub(4)T(4-STh)P super(2-), due to their capability to form J-aggregates with distinguished optical properties and well-defined nanostructures. In this study, we investigated the co-assembly behaviours of the zwitterionic porphyrins in aqueous solution by UV-vis and RLS, and investigated the morphology of the resultant homogeneously mixed J-aggregates by AFM. In the case of the combination of H sub(4)TSPP super(2-) and H sub(4)T(5-STh)P super(2-), they readily co-assemble to form homogeneously mixed J-aggregates with different types of binary excitonic bands, whereas the combination of H sub(4)T(4-STh)P super(2-) and other porphyrins results in the dominant formation of the individual pure J-aggregates. Deposited homogeneously mixed J-aggregates of H sub(4)TSPP super(2-) with H sub(4)T(5-STh)P super(2-) consist of rod-shaped nanostructures, whose height changes discontinuously upon varying the mixing ratio. These results would provide new insights into the electronic properties and the nanostructure of self-assembled multicomponent materials.
ISSN:1463-9076
1463-9084
DOI:10.1039/c1cp22678a