Cited by 14Molecular Junctions and NanostructuresSurface Chemistry and CatalysisForce Microscopy Techniques and Applications

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·2015·ACS Nano

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.

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Crossref · 10.1021/acsnano.5b03466

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  • The RPBE exchange functional and van der Waals correction used in this study were previously shown to yield good agreement with experiments in terms of energetics and electronic structure for similar gas adsorption on an organometallic system.

    “We used the RPBE exchange functional,22,23 and the van der Waals (vdW) correction24 which were previously shown to yield a good agreement with experiments in terms of energetics and electronic structure for similar gas adsorption on an organometallic system.25”

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Authors
Kim, H., Chang, Y. H., Jang, W.-J., Lee, E.-S., Kim, Y.-H., & Kahng, S.-J.
Affiliations
  • Korea University (KR)
  • Korea Advanced Institute of Science and Technology (KR)
Corresponding author
  • Kim, Yong-Hyun
  • Kahng, Se-Jong
Venue
ACS Nano
Published
2015-07-17
Volume
9
Issue
7
Pages
7722-7728
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
OpenAlex
W915013320
Cited by
14
References
35
Citations by year
2025: 1 · 2024: 1 · 2022: 2 · 2021: 2 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 2 · 2016: 2
FWCI
0.80
Type
journal article
Language
en
Open access
closed
Locations
  • ACS Nano (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Research Foundation of Korea (2012-01013222, 2012R1A2A2A01046191, 2014-11051782)
  • Global Frontier R&D program (2011-0031566: Center for Multiscale Energy Systems)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Molecular Junctions and Nanostructures
  • Physical Sciences › Engineering › Biomedical Engineering › Surface Chemistry and Catalysis
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Force Microscopy Techniques and Applications
Keywords
nitric oxide, metalloporphyrins, cobalt porphyrin, axial coordination, inelastic electron tunneling, dissociation rate, threshold voltage, Au(111), reaction mechanism

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