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https://doi.org/10.1021/nn900570v
Title: | Synthesis and electrical characterization of oligo(phenylene ethynylene) molecular wires coordinated to transition metal complexes | Authors: | Ng, Z. Loh, K.P. Li, L. Ho, P. Bai, P. Yip, J.H.K. |
Keywords: | Molecular electronics Molecular wire Negative differential resistance Scanning tunneling microscopy Self-assembly |
Issue Date: | 25-Aug-2009 | Citation: | Ng, Z., Loh, K.P., Li, L., Ho, P., Bai, P., Yip, J.H.K. (2009-08-25). Synthesis and electrical characterization of oligo(phenylene ethynylene) molecular wires coordinated to transition metal complexes. ACS Nano 3 (8) : 2103-2114. ScholarBank@NUS Repository. https://doi.org/10.1021/nn900570v | Abstract: | Organometallic wires are interesting alternatives to conventional molecular wires based on a pure organic system because of the presence of d orbitals in the transition metal complex. However, synthetic problems, such as decreased stability of the compounds when labile metal complexes are present, often impede their isolation in a pure state and preclude a rapid development of such hybrid molecular wires. In this work, we show that preassembled self-assembled monolayers (SAM) based on pyridine-terminated 1-((4- acetylthiophenyl)ethynyl)- 4-((4-pyridyl)ethynyl)benzene can act as a template for the architectural build up of a second layer of transition metal complexes to form an array of organometallic molecular wires on gold. RuII(terpy)(bipy) 2+ (terpy =2, 2′: 6′, 2″-terpyridine and bipy = 2, 2′-bipyridine) or cyclometalated PtII(pbipy) (pbipy = 6-phenyl-2, 2′-bipyridine) were axially coordinated onto the organic SAM via its terminal pyridinium moieties. Current-voltage studies show that the electronic coupling between the transition metal and organic wire produces a molecular wire that exhibits higher conductance than the original organic chain. The presence of the transition metal complexes in the hybrid molecular wire introduces distinctive negative differential resistance (NDR) effects. © 2009 American Chemical Society. | Source Title: | ACS Nano | URI: | http://scholarbank.nus.edu.sg/handle/10635/95061 | ISSN: | 19360851 | DOI: | 10.1021/nn900570v |
Appears in Collections: | Staff Publications |
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