Axial coordination and electronic structure of diatomic NO, CO, and O-2 molecules adsorbed onto Co-tetraphenylporphyrin on Au(111), Ag(111), and Cu(111): a density-functional theory study

Cited 5 time in webofscience Cited 0 time in scopus
  • Hit : 418
  • Download : 0
Based on density functional theory calculations, we investigated the axial bindings of diatomic molecules (NO, CO, and O-2) to metalloporphyrins and their spin switching behaviors. These binding reactions provide the ways to control molecular states and spins in metalloporphyrin systems that can be used in bio-sensing and spintronic applications. To microscopically understand the non-trivial axial binding structures and spin-switching behaviors of diatomic molecules (NO, CO, and O-2) adsorbed onto Co-tetraphenylporphyrin (CoTPP), we performed spin-polarized density functional theory (DFT) calculations for various CoTPP systems on Au(111), Ag(111), and Cu(111) substrates. We also systematically evaluated the effects of van der Waals and Hubbard U corrections by directly comparing the electronic structure with the results of scanning tunnelling microscopy. From the calculation results, we have found that a NO molecule, almost 60 degrees tilted away from the axial direction, is coordinated with CoTPP with a binding energy of 1.2-1.7 eV depending on substrates, and the spin state of CoTPP is completely switched off due to the charge transfer from NO to CoTPP. On the other hand, CO and O-2 molecules rather weakly interact with a binding energy of 0.4-0.8 eV, and a spin polarization of similar to 1 mu B is still present at CoTPP. A CO molecule is expected to be almost straightly coordinated along the axial direction of CoTPP, but O-2 is tilted similarly to the NO case. Regarding the substrate effects, we have found that there is noticeable charge transfer from Ag(111) and Cu(111) to CoTPP, but no significant charge transfer from Au(111) to CoTPP. These findings of the axial coordination and spin states for NO, CO, and O-2 adsorbed CoTPP systems will be useful for understanding bio-sensing mechanisms and designing molecular spintronic systems
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2016-08
Language
English
Article Type
Article
Keywords

SCANNING-TUNNELING-MICROSCOPY; NITRIC-OXIDE; NERVOUS-SYSTEM; PORPHYRIN; CHEMISTRY; SURFACE; GLUTAMATE; LIGANDS; BINDING

Citation

DALTON TRANSACTIONS, v.45, no.42, pp.16673 - 16681

ISSN
1477-9226
DOI
10.1039/c6dt01965j
URI
http://hdl.handle.net/10203/214640
Appears in Collection
NT-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 5 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0