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Keywords:

  • conductance;
  • cyclodextrin;
  • supramolecular;
  • thioctic acid;
  • tunnelling

An elementary supramolecular conducting system was constructed using a novel (±)-thioctic acid-functionalized β-cyclodextrin host deposited on a gold (Au) surface and an iridium-bearing guest molecule with biphenyl tails to insert specifically into the cyclodextrin cavity. The resulting supramolecular system was used to investigate remote electron communication between the flat Au surface and the platinum (Pt)/iridium (Ir) tip of a scanning tunnelling microscope. The morphology of the surfaces after successive deposition of host molecules followed by guest molecules was investigated. Formation of features of 2 nm size was shown on the Au surface functionalised with the supramolecular system. I–V spectroscopic analysis of the tunnelling current through this supramolecular layer revealed the relation between the effective barrier height and tunnelling distance. Thus, in the supramolecular host–metallo-guest system, a small increase of conductance is observed, compared to the layer without the guest. This can be attributed to the presence of the Ir-guest, which eventually creates intermediate energy states between the Au substrate and the Pt/Ir tip. Copyright © 2011 John Wiley & Sons, Ltd.

Featured Compounds

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  1. 1 - 7
Compound 5
Molecular Weight:2642.635
Molecular Formula:C112H189N7O35S14
InChIKey:YCLZPBKKJJPPRG-AJGOQIDUSA-N
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Compound 4
Molecular Weight:1324.463
Molecular Formula:C56H105N7O28
InChIKey:QNJMWDRYETXWEO-YKIOMNDOSA-N
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Compound 6
Molecular Weight:963.137
Molecular Formula:C54H38IrN6
InChIKey:IMFCUDCAUURIIP-UHFFFAOYSA-N
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Compound 1
Molecular Weight:1575.261
Molecular Formula:C42H63Br7O28
InChIKey:XNNRROJOWZLYCK-FOUAGVGXSA-N
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Compound 2
Molecular Weight:1310.0735
Molecular Formula:C42H63N21O28
InChIKey:OLPQEMQLAVINTB-FOUAGVGXSA-N
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Compound 3
Molecular Weight:1506.4456
Molecular Formula:C56H91N21O28
InChIKey:UTSPXLVPBALKQA-YKIOMNDOSA-N
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Compound biptpty
Molecular Weight:385.4599
Molecular Formula:C27H19N3
InChIKey:KASNEZRELMXILE-UHFFFAOYSA-N
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