4.6 Article

Does F4TCNQ Adsorption on Cu(111) Form a 2D-MOF?

Journal

JOURNAL OF PHYSICAL CHEMISTRY C
Volume -, Issue -, Pages -

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.3c04927

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The results show that F(4)TCNQ on Cu(111) forms a two-dimensional metal-organic framework by incorporating Cu adatoms into the molecular overlayer.
The results of a quantitative experimental structural investigation of the adsorption phases formed by 2,3,5,6-tetrafluoro-7,7 ',8,8 '-tetracyanoquinodimethane (F(4)TCNQ) on Cu(111) are reported. A particular objective was to establish whether Cu adatoms are incorporated into the molecular overlayer. A combination of normal incidence X-ray standing waves, low-energy electron diffraction, scanning tunneling microscopy, and X-ray photoelectron spectroscopy measurements, complemented by dispersion-inclusive density functional theory calculations, demonstrates that F(4)TCNQ on Cu(111) does cause Cu adatoms to be incorporated into the overlayer to form a two-dimensional metal-organic framework (2D-MOF). This conclusion is shown to be consistent with the behavior of F4TCNQ adsorption on other coinage metal surfaces, despite an earlier report concluding that the adsorption structure on Cu(111) is consistent with the absence of any substrate reconstruction.

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