Coverage‐Controlled Superstructures of <i>C</i><sub>3</sub>‐Symmetric Molecules: Honeycomb versus Hexagonal Tiling

Jasper-Tönnies, Torben; Gruber, Manuel; Ulrich, Sandra; Herges, Rainer; Berndt, Richard

doi:10.1002/ange.202001383

Cited by 7 publications

(9 citation statements)

References 62 publications

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“…It should be noted that physisorption (induced by van der Waals interactions) is sometimes incorrectly assumed to be weak. The adsorption energy of physisorbed relatively small molecules can be on the order of a few electronvolts [84,85].…”

Section: Fragmentation Of Sco Complexes On Metal Substratesmentioning

confidence: 99%

Spin-Crossover Complexes in Direct Contact with Surfaces

Gruber

Berndt

2020

Magnetochemistry

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The transfer of the inherent bistability of spin crossover compounds to surfaces has attracted considerable interest in recent years. The deposition of the complexes on surfaces allows investigating them individually and to further understand the microscopic mechanisms at play. Moreover, it offers the prospect of engineering switchable functional surfaces. We review recent progress in the field with a particular focus on the challenges and limits associated with the dominant experimental techniques used, namely near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and scanning tunneling microscopy (STM). One of the main difficulties in NEXAFS-based experiments is to ascertain that the complexes are in direct contact with the surfaces. We show that molecular coverage determination based on the amplitude of the edge-jump of interest is challenging because the latter quantity depends on the substrate. Furthermore, NEXAFS averages the signals of a large number of molecules, which may be in different states. In particular, we highlight that the signal of fragmented molecules is difficult to distinguish from that of intact and functional ones. In contrast, STM allows investigating individual complexes, but the identification of the spin states is at best done indirectly. As quite some of the limits of the techniques are becoming apparent as the field is gaining maturity, their detailed descriptions will be useful for future investigations and for taking a fresh look at earlier reports.

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Section: Fragmentation Of Sco Complexes On Metal Substratesmentioning

confidence: 99%

Spin-Crossover Complexes in Direct Contact with Surfaces

Gruber

Berndt

2020

Magnetochemistry

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“…We must also consider the pro-chiral nature of the truxenone molecule, which has been addressed in the previous studies of truxenones , and similarly symmetrical molecules. − Surface-induced enantiomers are clearly possible, but no “handedness” has ever been observed (using LEED or STM) in the (8 × 8) structure (or, for that matter, in the molecules themselves). This either means that they are indistinguishable (if they form islands with like-handedness molecules) or that the networks are racemic/insensitive to handedness.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Insights into the Adsorption Structure of Diindeno[1,2-a;1′,2′-c]fluorene-5,10,15-trione (Truxenone) on a Cu(111) Surface Using X-ray Standing Waves

et al. 2021

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The adsorption structure of truxenone on Cu(111) was determined quantitatively using normal-incidence X-ray standing waves. The truxenone molecule was found to chemisorb on the surface, with all adsorption heights of the dominant species on the surface less than ∼2.5 Å. The phenyl backbone of the molecule adsorbs mostly parallel to the underlying surface, with an adsorption height of 2.32 ± 0.08 Å. The C atoms bound to the carbonyl groups are located closer to the surface at 2.15 ± 0.10 Å, a similar adsorption height to that of the chemisorbed O species; however, these O species were found to adsorb at two different adsorption heights, 1.96 ± 0.08 and 2.15 ± 0.06 Å, at a ratio of 1:2, suggesting that on average, one O atom per adsorbed truxenone molecule interacts more strongly with the surface. The adsorption geometry determined herein is an important benchmark for future theoretical calculations concerning both the interaction with solid surfaces and the electronic properties of a molecule with electron-accepting properties for applications in organic electronic devices.

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“…Supramolecular self-assembly of small planar aromatic molecules at surfaces can provide a tremendous variety of nanostructures by taking advantage of weak and reversible intermolecular interactions, as revealed at the single molecule level by scanning probe microscopy. [1][2][3][4][5] Among the various tessellation patterns that can be created, the honeycomb network is particularly attractive due to its nanoporosity 2,6,7 leading to confinement effects 8 or potentially representing a prototypical system of host-guest molecular complexes. [9][10][11] In some cases, the system can be self-accommodating, i.e.…”

Section: Introductionmentioning

confidence: 99%

Self-Accommodating Honeycomb Networks from Supramolecular Self-Assembly of s-Indacene-tetrone on Silver Surfaces

Kalashnyk

Clair

2022

Langmuir

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We describe the self-assembly of s-indacene-tetrone on the Ag(111), Ag(100) and Ag(110) surfaces and the formation of three hydrogen-bonded supramolecular phases representing complex selfaccommodating honeycomb network. The differences in terms of relative host-guest stability and molecular density are analyzed and discussed. Different epitaxial behaviors of the 2D self-assembly are found as a response to the variations in the crystallographic orientation of the surface.

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Coverage‐Controlled Superstructures of C₃‐Symmetric Molecules: Honeycomb versus Hexagonal Tiling

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 7 publications

References 62 publications

Spin-Crossover Complexes in Direct Contact with Surfaces

Spin-Crossover Complexes in Direct Contact with Surfaces

Quantitative Insights into the Adsorption Structure of Diindeno[1,2-a;1′,2′-c]fluorene-5,10,15-trione (Truxenone) on a Cu(111) Surface Using X-ray Standing Waves

Self-Accommodating Honeycomb Networks from Supramolecular Self-Assembly of s-Indacene-tetrone on Silver Surfaces

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Coverage‐Controlled Superstructures of C3‐Symmetric Molecules: Honeycomb versus Hexagonal Tiling

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 7 publications

References 62 publications

Spin-Crossover Complexes in Direct Contact with Surfaces

Spin-Crossover Complexes in Direct Contact with Surfaces

Quantitative Insights into the Adsorption Structure of Diindeno[1,2-a;1′,2′-c]fluorene-5,10,15-trione (Truxenone) on a Cu(111) Surface Using X-ray Standing Waves

Self-Accommodating Honeycomb Networks from Supramolecular Self-Assembly of s-Indacene-tetrone on Silver Surfaces

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Coverage‐Controlled Superstructures of C₃‐Symmetric Molecules: Honeycomb versus Hexagonal Tiling