Probing Single-Molecule Dissociations from a Bimolecular Complex NO-Co-Porphyrin

Howon Kim, Yun Hee Chang, Won Jun Jang, Eui Sup Lee, Yong Hyun Kim, Se-Jong Kahng

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Axial coordinations of diatomic NO molecules to metalloporphyrins play key roles in dynamic processes of biological functions such as blood pressure control and immune response. Probing such reactions at the single molecule level is essential to understand their physical mechanisms but has been rarely performed. Here we report on our single molecule dissociation experiments of diatomic NO from NO-Co-porphyrin complexes describing its dissociation mechanisms. Under tunneling junctions of scanning tunneling microscope, both positive and negative energy pulses gave rise to dissociations of NO with threshold voltages, +0.68 and -0.74 V at 0.1 nA tunneling current on Au(111). From the observed power law relations between dissociation rate and tunneling current, we argue that the dissociations were inelastically induced with molecular orbital resonances by stochastically tunneling electrons, which is supported with our density functional theory calculations. Our study shows that single molecule dissociation experiments can be used to probe reaction mechanisms in a variety of axial coordinations between small molecules and metalloporphyrins.

Original languageEnglish
Pages (from-to)7722-7728
Number of pages7
JournalACS Nano
Volume9
Issue number7
DOIs
Publication statusPublished - 2015 Jul 28

Fingerprint

Porphyrins
porphyrins
dissociation
Molecules
Metalloporphyrins
molecules
blood pressure
Electron tunneling
Pressure control
Blood pressure
Molecular orbitals
electron tunneling
diatomic molecules
Threshold voltage
threshold voltage
Density functional theory
molecular orbitals
Microscopes
Experiments
microscopes

Keywords

  • bimolecular reaction
  • density functional theory
  • dissociation
  • metalloporphyrin
  • nitric oxide
  • scanning tunneling microscopy

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Probing Single-Molecule Dissociations from a Bimolecular Complex NO-Co-Porphyrin. / Kim, Howon; Chang, Yun Hee; Jang, Won Jun; Lee, Eui Sup; Kim, Yong Hyun; Kahng, Se-Jong.

In: ACS Nano, Vol. 9, No. 7, 28.07.2015, p. 7722-7728.

Research output: Contribution to journalArticle

Kim, Howon ; Chang, Yun Hee ; Jang, Won Jun ; Lee, Eui Sup ; Kim, Yong Hyun ; Kahng, Se-Jong. / Probing Single-Molecule Dissociations from a Bimolecular Complex NO-Co-Porphyrin. In: ACS Nano. 2015 ; Vol. 9, No. 7. pp. 7722-7728.
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