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Selective Supramolecular Fullerene-Porphyrin Interactions and Switching in Surface-Confined C-60-Ce(TPP)(2) Dyads


Vijayaraghavan, Saranyan; Ecija, David; Auwaerter, Willi; Joshi, Sushobhan; Seufert, Knud; Seitsonen, Ari P; Tashiro, Kentaro; Barth, Johannes V (2012). Selective Supramolecular Fullerene-Porphyrin Interactions and Switching in Surface-Confined C-60-Ce(TPP)(2) Dyads. Nano letters, 12(8):4077-4083.

Abstract

The control of organic molecules, supramolecular complexes and donor acceptor systems at interfaces is a key issue in the development of novel hybrid architectures for regulation of charge-carrier transport pathways in nano-electronics or organic photovoltaics. However, at present little is known regarding the intricate features of stacked molecular nanostructures stabilized by noncovalent interactions. Here we explore at the single molecule level the geometry and electronic properties of model donor-acceptor dyads stabilized by van der Waals interactions on a single crystal Ag(111) support. Our combined scanning tunneling microscopy/spectroscopy (STM/STS) and first-principles computational modeling study reveals site-selective positioning of C-60 molecules on Ce(TPP)(2) porphyrin double-decker arrays with the fullerene centered on the pi-system of the top bowl-shaped tetrapyrrole macroc-ycle. Three specific orientations of the C-60 cage in the van der Waals complex are identified that can be reversibly switched by STM manipulation protocols. Each configuration presents a distinct conductivity, which accounts for a tristable molecular switch and the tunability of the intradyad coupling. In addition, STS data evidence electronic decoupling of the hovering C-60 units from the metal substrate, a prerequisite for photophysical applications.

Abstract

The control of organic molecules, supramolecular complexes and donor acceptor systems at interfaces is a key issue in the development of novel hybrid architectures for regulation of charge-carrier transport pathways in nano-electronics or organic photovoltaics. However, at present little is known regarding the intricate features of stacked molecular nanostructures stabilized by noncovalent interactions. Here we explore at the single molecule level the geometry and electronic properties of model donor-acceptor dyads stabilized by van der Waals interactions on a single crystal Ag(111) support. Our combined scanning tunneling microscopy/spectroscopy (STM/STS) and first-principles computational modeling study reveals site-selective positioning of C-60 molecules on Ce(TPP)(2) porphyrin double-decker arrays with the fullerene centered on the pi-system of the top bowl-shaped tetrapyrrole macroc-ycle. Three specific orientations of the C-60 cage in the van der Waals complex are identified that can be reversibly switched by STM manipulation protocols. Each configuration presents a distinct conductivity, which accounts for a tristable molecular switch and the tunability of the intradyad coupling. In addition, STS data evidence electronic decoupling of the hovering C-60 units from the metal substrate, a prerequisite for photophysical applications.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:August 2012
Deposited On:18 Jan 2013 15:34
Last Modified:05 Apr 2016 15:59
Publisher:American Chemical Society
ISSN:1530-6984
Publisher DOI:https://doi.org/10.1021/nl301534p
Other Identification Number:ISI:000307211000034

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