Title

Two-Photon Absorption Enhancement of Polymer-Templated Porphyrin-Based J-Aggregates

Authors

Authors

S. Biswas; H. Y. Ahn; M. V. Bondar;K. D. Belfield

Comments

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Abbreviated Journal Title

Langmuir

Keywords

FLUORESCENCE; DYNAMICS; PSEUDOISOCYANIN; LINESHAPES; DYES; Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, ; Multidisciplinary

Abstract

Supramolecular structures based on organized assemblies of macrocyclic chromophores, particularly porphyrin-based dyes, have attracted widespread interest as components of molecular devices with potential applications in molecular electronics, artificial light harvesting, and pharmacology. We report the formation of J-aggregates of two porphyrin-based dyes, 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TSPP, 4) and an amino tris-sulfonate analogue (S) in water using a functionalized norbornene-based homopolymer, synthesized by ring-opening metathesis polymerization (ROMP). Ionic interactions of the cationic side chains (ammonium groups) of the polymer under acidic conditions with the negatively charged sulfonate groups of the porphyrins facilitated polymer template enhanced J-aggregation of the porphyrin dyes. J-Aggregation behavior was investigated photophysically by UV-vis absorption along with steady-state and time-resolved fluorescence studies. Two-photon absorption (2PA) was enhanced by about an order of magnitude for the J-aggregated TSPP relative to its free base. Significantly, the 2PA cross section of the polymer-templated TSPP J-aggregate was up to three times higher than the J-aggregated TSPP in the absence of the polymer template while the 2PA cross section for polymer-templated J-aggregates of 5 increased substantially up to ca. 10 000 GM, suggesting a prominent role of polymer-templating to facilitate porphyrin aggregation and greatly enhance nonlinear absorption.

Journal Title

Langmuir

Volume

28

Issue/Number

2

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

1515

Last Page

1522

WOS Identifier

WOS:000299137800053

ISSN

0743-7463

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