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Title: Direct quantitative identification of the “surface trans-effect”

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/c6sc01677d· OSTI ID:1435768
 [1];  [2];  [2];  [3];  [4];  [5];  [5];  [6];  [1];  [7];  [8];  [1]
  1. Technische Univ. of Munich (Germany). Physics Dept.
  2. Univ. of Oklahoma, Norman, OK (United States). Center for Interfacial Reaction Engineering, School of Chemical, Biological and Materials Engineering
  3. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.; Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics
  4. Univ. of Warwick, Coventry (United Kingdom). Dept. of Chemistry
  5. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  6. Univ. Paris Sciences & Lettres (PSL), Paris (France). ENS - Dept. of Chemistry
  7. Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics
  8. Technische Univ. of Munich (Germany). Physics Dept.; Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.

The strong parallels between coordination chemistry and adsorption on metal surfaces, with molecules and ligands forming local bonds to individual atoms within a metal surface, have been established over many years of study. The recently proposed “surface trans-effect” (STE) appears to be a further manifestation of this analogous behaviour, but so far the true nature of the modified molecule–metal surface bonding has been unclear. The STE could play an important role in determining the reactivities of surface-supported metal–organic complexes, influencing the design of systems for future applications. However, the current understanding of this effect is incomplete and lacks reliable structural parameters with which to benchmark theoretical calculations. Using X-ray standing waves, we demonstrate that ligation of ammonia and water to iron phthalocyanine (FePc) on Ag(111) increases the adsorption height of the central Fe atom; dispersion corrected density functional theory calculations accurately model this structural effect. The calculated charge redistribution in the FePc/H2O electronic structure induced by adsorption shows an accumulation of charge along the σ-bonding direction between the surface, the Fe atom and the water molecule, similar to the redistribution caused by ammonia. Finally, this apparent σ-donor nature of the observed STE on Ag(111) is shown to involve bonding to the delocalised metal surface electrons rather than local bonding to one or more surface atoms, thus indicating that this is a true surface trans-effect.

Research Organization:
Univ. of Oklahoma, Norman, OK (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0004600; 247299; EP/H021388/1
OSTI ID:
1435768
Journal Information:
Chemical Science, Vol. 7, Issue 9; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (6)

Vibrational fingerprint of localized excitons in a two-dimensional metal-organic crystal journal November 2018
Spatial decoupling of macrocyclic metal–organic complexes from a metal support: a 4-fluorothiophenol self-assembled monolayer as a thermally removable spacer journal January 2019
Local adsorption structure and bonding of porphine on Cu(111) before and after self-metalation journal March 2019
Interfacial engineering of phthalocyanine molecules on graphitic and metal substrates journal December 2016
Tuning and sensing spin interactions in Co-porphyrin/Au with N H 3 and N O 2 binding journal December 2019
Molecular anchoring stabilizes low valence Ni(i)TPP on copper against thermally induced chemical changes journal January 2020

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