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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
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.
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
ISSN: 19360851
DOI: 10.1021/nn900570v
Appears in Collections:Staff Publications

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