Issue 3, 2012

Homogeneously mixed porphyrin J-aggregates with rod-shaped nanostructuresvia zwitterionic self-assembly

Abstract

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, H4TSPP2, H4T(5-STh)P2 and H4T(4-STh)P2, 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 H4TSPP2 and H4T(5-STh)P2, they readily co-assemble to form homogeneously mixed J-aggregates with different types of binary excitonic bands, whereas the combination of H4T(4-STh)P2 and other porphyrins results in the dominant formation of the individual pure J-aggregates. Deposited homogeneously mixed J-aggregates of H4TSPP2 with H4T(5-STh)P2 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.

Graphical abstract: Homogeneously mixed porphyrin J-aggregates with rod-shaped nanostructuresvia zwitterionic self-assembly

Article information

Article type
Paper
Submitted
21 Aug 2011
Accepted
14 Nov 2011
First published
02 Dec 2011

Phys. Chem. Chem. Phys., 2012,14, 1270-1276

Homogeneously mixed porphyrin J-aggregates with rod-shaped nanostructuresvia zwitterionic self-assembly

Y. Arai, K. Tsuzuki and H. Segawa, Phys. Chem. Chem. Phys., 2012, 14, 1270 DOI: 10.1039/C1CP22678A

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