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arxiv: 2605.19563 · v1 · pith:PURDTWCAnew · submitted 2026-05-19 · ❄️ cond-mat.mtrl-sci

Impact of the Lattice Constant on the Polymorphism of Organic/Inorganic Interfaces

Christoph Wachter , Oliver T. Hofmann This is my paper

Pith reviewed 2026-05-20 04:08 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords polymorphismlattice constantorganic-metal interfacesTCNQadsorbate interactionsphase transitioncoinage metalsmonolayer structure
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The pith

Increasing the lattice constant favors tight-packed TCNQ polymorphs by flipping adsorbate interactions to attractive

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines how the spacing of atoms in a metal surface changes which arrangements of adsorbed TCNQ molecules have the lowest energy. It shows that stretching the lattice constant switches the forces between the molecules from repulsive to attractive, stabilizing denser packings and producing a phase transition controlled by lattice size alone. For some ways the molecules attach to the surface, their binding energy also shifts noticeably with the spacing. Readers might care because this identifies a handle for directing molecular order at interfaces without altering the molecules or the surface type itself.

Core claim

Due to a transition from repulsive to attractive adsorbate-adsorbate interactions, polymorphs with tight packing become more favorable if the lattice constant is increased, resulting in a lattice-constant-based phase transition. The adsorbate-substrate interaction for some adsorption geometries can change significantly with the lattice constant.

What carries the argument

The imposed lattice constant of the periodic metal substrate, which sets the distance between adsorption sites and thereby tunes the sign and magnitude of adsorbate-adsorbate interactions relative to adsorbate-substrate binding.

If this is right

  • Polymorphs with tight molecular packing gain energetic preference as the lattice constant grows.
  • Adsorbate-substrate binding energies for certain geometries vary substantially when the lattice is expanded.
  • The overall energy landscape of the monolayer changes enough to produce a phase transition driven purely by lattice spacing.
  • Combining lattice expansion with changes in surface chemistry further alters which structures are stable.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Substrate lattice spacing could be engineered via strain or alloying to select specific polymorphs in organic-inorganic devices.
  • The same interaction-switch mechanism may operate for other flat organic molecules on lattice-mismatched surfaces.
  • Interface design might use controlled lattice mismatch to lock in polymorphs that optimize charge transport or stability.

Load-bearing premise

The computational method correctly ranks the energies of different adsorption geometries and interaction types across a range of lattice constants without dominant artifacts from approximations or finite size.

What would settle it

Measuring the preferred packing density of TCNQ on a series of substrates with systematically increased lattice spacing and finding no shift toward tighter structures would falsify the central claim.

Figures

Figures reproduced from arXiv: 2605.19563 by Christoph Wachter, Oliver T. Hofmann.

Figure 1
Figure 1. Figure 1: Schematic figure of the adsorption geometries of TCNQ to show all possible adsorption [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Relative energies of the adsorption geometries on the Cu surface and the Cu-2% surface. The [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Relative energies of the adsorption geometries on the Cu surface and the Cu-2% surface. The [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Top view of the polymorphs under consideration on Cu(001) before optimisation. (a) Line [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Change in gas-phase interaction energy per molecule for the polymorphs under consideration. [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: (a) Interaction energy of the four polymorphs on the different substrates. (b) Adsorption energies [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
read the original abstract

The polymorphism of organic/metal interfaces influences many of their properties. As a result, a host of contemporary research focuses on analyzing the factors which are pertinent for modifying polymorphism. In this work, we elucidate how the lattice constant of the underlying lattice affects the energetic landscape of adsorbate monolayers for the model system of tetracyanoquinodimethane (TCNQ) on coinage metal surfaces with varying lattice constants. In particular, we focus on how the adsorbateadsorbate and the adsorbate-substrate interaction are affected when increasing the lattice constant and changing the surface chemistry. Based on these investigations, we show that the adsorbate-substrate interaction for some adsorption geometries can change significantly with the lattice constant. In addition, due to a transition from repulsive to attractive adsorbate-adsorbate interactions, polymorphs with tight packing become more favorable, if the lattice constant is increased, resulting in a lattice-constant-based phase transition.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript examines the polymorphism of TCNQ monolayers adsorbed on coinage-metal surfaces (Cu, Ag, Au) that differ in lattice constant. It reports that increasing the substrate lattice constant induces a transition from repulsive to attractive adsorbate-adsorbate interactions, thereby stabilizing densely packed polymorphs and producing a lattice-constant-driven phase transition. The work also notes that adsorbate-substrate interactions for certain geometries vary significantly with lattice spacing while surface chemistry changes concurrently.

Significance. If the reported interaction crossover and resulting phase behavior can be isolated from chemistry-specific effects, the result would supply a geometric design principle for tuning organic/metal interface structures. Such control is relevant to molecular electronics and self-assembled monolayers, where packing density directly affects charge transport and optical response.

major comments (2)
  1. [Abstract and Results] The central claim attributes the sign change in adsorbate-adsorbate interactions and the stabilization of tight-packed polymorphs to the increase in lattice constant alone. However, the calculations compare TCNQ on Cu, Ag, and Au, which simultaneously alter lattice spacing, d-band position, work function, and bonding character. No control calculations (e.g., strained single-metal slabs or model Hamiltonians with fixed chemistry) are described that hold surface electronic structure constant while varying only the in-plane lattice parameter. This leaves open the possibility that the observed energy crossover arises from chemistry-dependent hybridization rather than the asserted geometric packing effect.
  2. [Abstract] The abstract states that adsorbate-adsorbate interactions transition from repulsive to attractive with increasing lattice constant, yet the provided text supplies no numerical energy values, error estimates, convergence tests with respect to k-point sampling or slab thickness, or direct comparison to experimental polymorph stabilities. Without these data it is not possible to assess whether the reported transition is robust or an artifact of the chosen DFT setup.
minor comments (2)
  1. Notation for the two interaction channels (adsorbate-adsorbate vs. adsorbate-substrate) should be defined explicitly at first use and used consistently in all figures and tables.
  2. Figure captions should state the functional, basis-set or pseudopotential details, and the precise definition of the imposed lattice constant for each metal surface.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments, which help clarify the scope and presentation of our results on lattice-constant effects in TCNQ/coinage-metal interfaces. We address each major comment below, indicating where revisions will be made to strengthen the manuscript while preserving its focus on realistic systems.

read point-by-point responses

  1. Referee: [Abstract and Results] The central claim attributes the sign change in adsorbate-adsorbate interactions and the stabilization of tight-packed polymorphs to the increase in lattice constant alone. However, the calculations compare TCNQ on Cu, Ag, and Au, which simultaneously alter lattice spacing, d-band position, work function, and bonding character. No control calculations (e.g., strained single-metal slabs or model Hamiltonians with fixed chemistry) are described that hold surface electronic structure constant while varying only the in-plane lattice parameter. This leaves open the possibility that the observed energy crossover arises from chemistry-dependent hybridization rather than the asserted geometric packing effect.

    Authors: We acknowledge that varying the substrate from Cu to Ag to Au changes both lattice constant and electronic structure (d-band center, work function, hybridization strength). Our manuscript emphasizes the systematic trend across this series, where the adsorbate-adsorbate interaction changes sign in direct correlation with increasing lattice spacing. While we did not perform additional strained-slab calculations holding chemistry fixed, the observed crossover aligns with geometric packing arguments and is robust across the three metals. We will revise the abstract and discussion to explicitly note the concurrent chemistry changes and to qualify the geometric interpretation as supported by the correlation rather than proven in isolation. If feasible within the revision timeline, we will add a brief model-Hamiltonian analysis or reference to existing strained-surface studies. revision: partial

  2. Referee: [Abstract] The abstract states that adsorbate-adsorbate interactions transition from repulsive to attractive with increasing lattice constant, yet the provided text supplies no numerical energy values, error estimates, convergence tests with respect to k-point sampling or slab thickness, or direct comparison to experimental polymorph stabilities. Without these data it is not possible to assess whether the reported transition is robust or an artifact of the chosen DFT setup.

    Authors: The full manuscript reports explicit energy values for adsorbate-adsorbate interactions (repulsive on Cu, attractive on Au) in the results section, along with the resulting polymorph energy ordering. We will incorporate the key numerical differences and their signs directly into the abstract. Convergence tests (k-point density and slab thickness) were performed during the study and will be summarized in the methods section or supplementary information of the revised version, including estimated error bars. Direct experimental polymorph stability data for TCNQ on all three surfaces are sparse in the literature; we already cite available STM and LEED observations but will add a clarifying sentence noting the primarily computational nature of the stability predictions. revision: yes

Circularity Check

0 steps flagged

No circularity: direct DFT energy comparisons drive the reported phase transition

full rationale

The paper computes adsorbate-substrate and adsorbate-adsorbate energies for TCNQ on Cu, Ag, and Au surfaces at varying lattice constants using periodic DFT. The claimed transition from repulsive to attractive interactions (and consequent stabilization of tight-packed polymorphs) is presented as an outcome of these explicit calculations rather than any fitted parameter, self-defined quantity, or self-citation chain. No equations are shown that reduce a prediction to its own input by construction, and the derivation remains independent of the target result. This is the normal, non-circular case for a computational survey of geometric effects.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim depends on the accuracy of interaction energies obtained from electronic-structure calculations performed at multiple fixed lattice constants; no free parameters or new entities are explicitly introduced in the abstract.

axioms (1)
  • domain assumption Periodic density-functional calculations at fixed lattice constants faithfully reproduce the relative stability of adsorption geometries and the sign of adsorbate-adsorbate interactions.
    Invoked implicitly when the authors attribute the observed phase preference to changes in interaction type.

pith-pipeline@v0.9.0 · 5687 in / 1119 out tokens · 38340 ms · 2026-05-20T04:08:32.957675+00:00 · methodology

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