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REVIEW 3 major objections 5 minor 71 references

Heavier chalcogenofenchones for fundamental gas-phase studies of molecular chirality

T0 review · 3 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read This paper establishes thio-, seleno-, telluro-, and polonofenchone as a tunable family for gas-phase chirality experiments, anchored by measured S/Se spectra and extending to predicted Te/Po members.

desk verdict The experimental S/Se spectroscopy is solid and new; the parity-violation extrapolation to 10^-14 relies on one endpoint of a factor-180 method spread and should be tempered before the paper is taken as a benchmark. read the letter →

arxiv 2506.09906 v1 pith:T2SZU72K submitted 2025-06-11 physics.chem-ph

Manjinder Kour , Denis Kargin , Eileen Döring , Sudheendran Vasudevan , Martin Maurer , Pascal Stahl , Igor Vidanović , Clemens Bruhn
show 10 more authors
Wenhao Sun Steffen M. Giesen Thomas Baumert Robert Berger Hendrike Braun Guido W. Fuchs Thomas F. Giesen Rudolf Pietschnig Melanie Schnell Arne Senftleben
This is my paper · ORCID
classification physics.chem-ph
keywords chiralmoleculesfenchonechalcogenoketonesrotationalspectroscopyinfrareddensityfunctionaltheoryparityviolationphotoelectroncirculardichroism
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper aims to establish fenchone's heavier chalcogen derivatives, thiofenchone and selenofenchone, plus predictively telluro- and polonofenchone, as a bench-scale family for gas-phase studies of molecular chirality. Replacing the carbonyl oxygen with S, Se, Te, or Po changes the nuclear charge $Z$ at the chromophore while leaving the rigid bicyclic framework nearly untouched, which should amplify $Z$-sensitive effects such as electroweak parity violation and photoelectron circular dichroism. The authors synthesize and characterize 1-S and 1-Se, measure their gas-phase microwave and infrared spectra, and use DFT/VPT2 calculations to predict structures and vibrational spectra across the entire series. If the predictions hold, this compound family gives experimenters a systematically tunable knob, $Z$, for testing chirality-dependent physics in well-defined gas-phase conditions.

What carries the argument

The central object is the chalcogenofenchone series $\mathrm{1\text{-}X}$, a fenchone cage with a single C=X double bond where X runs through O, S, Se, Te, and Po. The load-bearing mechanism is the monotonic change in C=X bond length, atomic mass, and force constant down the chalcogen column: it shifts the characteristic C=X stretching fundamental from above $1700\,\text{cm}^{-1}$ into the fingerprint region and, through the nuclear charge $Z$, scales the electroweak parity-violating potential. The methodological machinery is B3LYP/aug-cc-pVTZ(-PP) harmonic and VPT2 anharmonic force-field calculations, validated against microwave-derived $r_0$ structures and low-resolution FTIR spectra, together with quasi-relativistic zeroth-order regular approximation calculations of parity-violating potentials.

What would settle it

Synthesize tellurofenchone or polonofenchone and measure its gas-phase infrared spectrum: if the most intense band assigned to C=Te stretching lies far from the predicted $1020\,\text{cm}^{-1}$, or C=Po stretching far from $965\,\text{cm}^{-1}$, the benchmark transferability of the DFT/VPT2 level is refuted. A high-resolution measurement of the C=Te stretching region could also test whether the predicted VPT2 combination bands near the fundamental are real or artifacts.

Watch

Extended reading notes

Core claim

The central claim is that heavier chalcogenofenchones $\mathrm{1\text{-}X}$ ($\mathrm{X = S, Se, Te, Po}$) form a structurally rigid, volatile, and synthetically accessible series in which the C=X unit can be moved down the periodic table. The paper provides experimental rotational constants and effective $r_0$ structures for thiofenchone and selenofenchone, gas-phase IR assignments for fenchone, thiofenchone, and selenofenchone, and the first predicted equilibrium structures and IR spectra for telluro- and polonofenchone, along with exploratory parity-violating potentials. The measured C=S and C=Se bond lengths, $1.6341(30)\,\text{\AA}$ and $1.773(21)\,\text{\AA}$, validate the chosen DFT level, and the C=X stretching fundamental drops monotonically from $1742\,\text{cm}^{-1}$ in fenchone to a predicted $965\,\text{cm}^{-1}$ in polonofenchone. On the Hartree-Fock level the computed parity-violating energy differences grow by roughly five orders of magnitude from fenchone to polonofenchone, consistent with the expected $Z^5$ scaling, which is the property that makes the series attractive for future parity-violation searches.

Load-bearing premise

The predictions for telluro- and polonofenchone rely on assuming that the same DFT/VPT2 level that works well for S and Se also describes the C=Te and C=Po force fields accurately enough for benchmark-quality spectra and parity-violating trends, even though no experiments exist for those compounds.

Editorial extensions

If this is right

  • With thiofenchone and selenofenchone now structurally pinned by microwave data, their rovibrational spectra become realistic targets for high-resolution searches, and the demonstrated quantum-cascade-laser line width of $0.001\,\text{cm}^{-1}$ in fenchone shows the needed precision is in reach.
  • The predicted positions of the C=Te and C=Po stretching fundamentals at about $1020$ and $965\,\text{cm}^{-1}$ give concrete spectral windows for future synthesis and rotationally resolved infrared tests of the heavier members.
  • If the computed $Z^5$ scaling holds, parity-violating vibrational splittings should rise from roughly $\Delta\nu/\nu \approx 10^{-19}$ in fenchone to about $10^{-14}$ in polonofenchone, moving the effect closer to detectability.
  • The rigid C=X chromophore provides a common framework for photoelectron circular dichroism studies, with the chromophore absorption shifting from about $488\,\text{nm}$ in thiofenchone to about $625\,\text{nm}$ in selenofenchone, thereby complementing the parity-violation program.
  • The validated force-field level can be used to assign combination bands and overtones in the dense fingerprint region, which will be important for interpreting any future high-resolution spectrum of a heavy chalcogenofenchone.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the DFT predictions survive direct measurement, the chalcogenofenchone series could serve as a calibration ladder for relativistic corrections in small chiral molecules, because the rigid cage keeps the geometry nearly fixed while only $Z$ changes.
  • The same $Z$-tunability could be extended to other terpenoid scaffolds, such as camphor derivatives, to test whether the observed scaling trends are specific to the C=X chromophore or generic to heavy-atom substitution near a stereogenic center.
  • A testable extension is to record the anharmonic C=X stretching region of tellurofenchone at high resolution; the VPT2-predicted intensity redistribution toward combination bands near the fundamental is a concrete, checkable prediction before any parity-violation search is attempted.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The manuscript reports the synthesis of thiofenchone (1-S) and selenofenchone (1-Se), their gas-phase rotational and vibrational spectra, and a combined experimental/theoretical study of the series 1-O, 1-S, 1-Se, 1-Te, and 1-Po. Microwave spectroscopy with multiple isotopologues provides r0 structures whose C=X bond lengths agree with B3LYP/aug-cc-pVTZ(-PP) calculations to within 0.01–0.02 Å and with low RMSD fits (2.7–6.6 kHz). Gas-phase IR spectra are compared with harmonic (scaled by 0.968) and VPT2 anharmonic spectra, leading to assignments including C=X stretching and bending modes. For the unsynthesized telluro- and polonofenchone, predicted IR spectra are presented. The paper closes with exploratory parity-violating energy calculations (Table XIII) and concludes that the series is a promising benchmark for Z-dependent chirality studies, with relative parity-violating splittings potentially reaching about 10^-14 in polonofenchone.

Significance. If the central claim is taken as establishing a validated experimental platform, the paper's contribution is valuable: it provides new gas-phase structural data for heavy chalcogen analogues of fenchone, identifies C=X vibrational signatures across the series, and makes concrete predictions for Te and Po derivatives. The strengths are the high-quality microwave data (multiple isotopologues, low RMSD), the external rather than fitted scaling factor, and the explicit acknowledgment of VPT2 resonance problems. However, the parity-violation extrapolation is not robust: the spread among HF, B3LYP, and LDA for 1-Po spans nearly two orders of magnitude, and the stated Z^5 scaling is confirmed only at the HF level. The benchmark claim for parity violation therefore goes beyond what the present calculations support, and the predicted IR spectra of 1-Te and 1-Po inherit unquantified VPT2 artifacts already visible in 1-Se.

major comments (3)
  1. [§3.4, Table XIII, Conclusion §4] The conclusion that polonofenchone reaches relative parity-violating splittings of about 10^-14 rests on the HF value of 5.7×10^-15 Eh for 1-Po. The same table gives B3LYP 9.1×10^-16 Eh and LDA 3.2×10^-17 Eh, a spread of roughly a factor of 180. The Z^5 scaling is confirmed only on the HF level; B3LYP and LDA show substantially weaker growth. Since the text itself states that correlation and geometry-relaxation effects cannot be ruled out, the extrapolation to 10^-14 is not supported without an uncertainty band or a more reliable method. I recommend either presenting a conservative range (e.g., 10^-16 to 10^-14) or restricting the benchmark claim for parity violation to the experimentally characterized members.
  2. [§3.2.2, Figures 15–16, Tables V and X] For 1-Se the VPT2 treatment freezes two C-H stretching modes and two bending modes, leading to a poorly reproduced C-H stretch region and a geminal-dimethyl doublet shifted by about 30 cm^-1, as the authors acknowledge. The predicted IR spectra of 1-Te and 1-Po are produced with the same DFT/VPT2 machinery but cannot be validated against experiment. The paper should state explicitly, in the sections presenting Figures 17–20 and Tables VI–VII and XI–XII, that these are unvalidated predictions whose accuracy is limited by the VPT2 artifacts already visible in 1-Se; otherwise the 'benchmark' status of the Te/Po predictions is overstated.
  3. [§2.3, §3.2.1] The single harmonic scaling factor of 0.968 is taken from an external benchmark for B3LYP/aug-cc-pVTZ (Ref 39). For Te and Po the calculations use aug-cc-pVTZ-PP with relativistic pseudopotentials, and the transferability of a factor calibrated for light-element systems is not demonstrated. Since the Te/Po band positions are central to the predicted series trend (Figure 9), the authors should either justify the transferability or provide unscaled harmonic and VPT2 values for the heavy members as a cross-check.
minor comments (5)
  1. [§2.2, first paragraph] The sentence 'Gas-phase MW spectra of 1-S and 1-S were recorded' should read '1-S and 1-Se'.
  2. [§1 and §3.2.1] Typos: 'champhor' should be 'camphor', 'Artimisinin' should be 'Artemisinin', and 'fudamental' should be 'fundamental'.
  3. [§3.2.2, paragraph beginning 'As for 1-S'] The phrase 'mostly redistributed to ... combination bands ν69+ν55 and ν65+ν57 emerging at 1061 cm^-1' is clear, but the corresponding peak assignment in Table X would benefit from a direct indication of which experimental peaks (12–9) are matched by each calculated band.
  4. [Figure 9] The figure caption would be clearer if the data points for 1-O through 1-Po were labeled directly on the plot, since the left-to-right ordering is not immediately apparent from the symbol style alone.
  5. [Table XIII] The table would be more informative if it included the Z dependence explicitly (e.g., a column with X and nuclear charge) and if the HF, B3LYP, and LDA values were accompanied by the ratio to the 1-O value, which would make the deviation from Z^5 scaling quantitative.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: measured spectra and structures are independent of the DFT predictions; the external scaling factor and disclosed frozen-mode approximation do not constitute circularity.

full rationale

The paper's central experimental results—microwave r0 structures of 1-S and 1-Se and gas-phase IR band positions—are measured and fitted directly to observed rotational constants and absorption spectra, not derived from the DFT calculations. The only calibrated input, the harmonic scaling factor 0.968, is taken from the independent external benchmark of Sinha et al. (Ref. 39), not fitted to the present molecules. The VPT2 treatment replaces anharmonic intensities by harmonic ones for explicitly frozen modes ('For all the frozen modes, the IR absorption intensity calculated for the corresponding harmonic modes was later used also for the anharmonic cases'); this is a disclosed approximation, not a predicted quantity. The 1-Te and 1-Po IR spectra are parameter-free DFT predictions validated by the O/S/Se agreement, which is a genuine external check. The parity-violation estimates use a published two-component ZORA operator and a modified Turbomole code; the Z^5 trend is computed from the quantum-chemical expectation values, not imposed by fitting, and the paper explicitly reports the large HF/B3LYP/LDA spread for 1-Po. Self-citations (Refs. 41-43, 45) concern implementation details and do not carry the central claim, which rests on independent synthesis, crystallography, rotational spectroscopy, and IR spectroscopy. No circular step is present.

Assumptions & free parameters 1 free parameters · 4 assumptions · 0 invented entities

The experimental measurements are largely self-contained: spectral fits and X-ray diffraction provide independent structural data. The forward-looking claims about Te and Po rest on domain assumptions about DFT/VPT2 reliability and the transferability of Z-scaling, which are listed as axioms.

free parameters (1)
  • Harmonic wavenumber scaling factor = 0.968
    External calibration constant from Ref 39, applied to all scaled harmonic spectra in this work; not fitted to the new experimental data, but listed because the computed band positions depend on it.
assumptions (4)
  • domain assumption B3LYP/aug-cc-pVTZ(-PP) with pseudopotentials for Te and Po yields reliable equilibrium structures and harmonic force fields for the chalcogenofenchone series.
    Computational method used throughout Section 2.3 and results; not benchmarked against Te/Po compounds because none are synthesized.
  • domain assumption VPT2 with full cubic and semi-diagonal quartic force fields, with resonant modes frozen, provides credible anharmonic band positions and intensities for these 27-atom molecules.
    Used in Section 3.2.2; the paper notes some frozen-mode artifacts, e.g., C-H stretch region of 1-Se and 30 cm-1 shift of geminal-dimethyl doublet.
  • domain assumption Parity-violating potentials computed at the equilibrium structure approximate the energy difference between enantiomers, and their Z-scaling transfers to rovibrational splittings (Letokhov).
    Used in Section 3.4 to extrapolate from computed Epv to anticipated Delta nu/nu ~ 10^-14 for 1-Po.
  • domain assumption The harmonic scaling factor 0.968 valid for fenchone applies unchanged to all heavier chalcogen analogues.
    Applied in Sections 3.2.1 for spectra of 1-O through 1-Po.

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Cite this review

Pith. "Pith review of Heavier chalcogenofenchones for fundamental gas-phase studies of molecular chirality." pith.science (2026). https://pith.science/paper/T2SZU72K

@misc{pith2026250609906,
  author       = {Pith},
  title        = {Pith review of: Heavier chalcogenofenchones for fundamental gas-phase studies of molecular chirality},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/T2SZU72K}},
  note         = {Machine review of arXiv:2506.09906}
}
abstract

Monoterpene ketones are frequently studied compounds that enjoy great popularity both in chemistry and in physics due to comparatively high volatility, stability, conformational rigidity and commercial availability. Herein, we explore the heavier chalcogenoketone derivatives of fenchone as promising benchmark systems -- synthetically accessible in enantiomerically pure form -- for systematic studies of nuclear charge ($Z$) dependent properties in chiral compounds. Synthesis, structural characterization, thorough gas-phase rotational and vibrational spectroscopy as well as accompanying quantum chemical studies on the density-functional-theory level reported in this work foreshadow subsequent applications of this compound class for fundamental investigations of molecular chirality under well-defined conditions.

Figures

Figures reproduced from arXiv: 2506.09906 by the authors.

Figure 1
Figure 1. FIG. 1. Molecular structure of one of the three independent molecules of (1 [PITH_FULL_IMAGE:figures/full_fig_p009_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. (A) Portion of the microwave spectrum of [PITH_FULL_IMAGE:figures/full_fig_p010_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3. Portion of the microwave spectrum of [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figures from the paper (30 more)
Figure 4
Figure 4. Figure 4: FIG. 4. Combined theoretical (red) and low-resolution experimental gas-phase vibrational overview [PITH_FULL_IMAGE:figures/full_fig_p016_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5. Combined theoretical (orange) and low-resolution experimental gas-phase vibrational [PITH_FULL_IMAGE:figures/full_fig_p021_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6. Combined theoretical (brown) and low-resolution experimental gas-phase vibrational [PITH_FULL_IMAGE:figures/full_fig_p027_6.png]
Figure 7
Figure 7. Figure 7: FIG. 7. Theoretical gas-phase vibrational overview spectrum of [PITH_FULL_IMAGE:figures/full_fig_p032_7.png]
Figure 8
Figure 8. Figure 8: FIG. 8. Theoretical gas-phase vibrational overview spectrum of [PITH_FULL_IMAGE:figures/full_fig_p036_8.png]
Figure 9
Figure 9. Figure 9: FIG. 9. Change in scaled harmonic vibrational wavenumber of the C=X stretching mode in asso [PITH_FULL_IMAGE:figures/full_fig_p041_9.png]
Figure 10
Figure 10. Figure 10: FIG. 10. Comparison of calculated harmonic vibrational spectra of chalcogenofenchones. From [PITH_FULL_IMAGE:figures/full_fig_p042_10.png]
Figure 11
Figure 11. Figure 11: FIG. 11. Comparison of theoretical harmonic (red envelope, black stick representation; directed [PITH_FULL_IMAGE:figures/full_fig_p045_11.png]
Figure 12
Figure 12. Figure 12: FIG. 12. Theoretical harmonic (red envelope, black stick representation; directed upwards) and [PITH_FULL_IMAGE:figures/full_fig_p046_12.png]
Figure 13
Figure 13. Figure 13: FIG. 13. Comparison of theoretical harmonic (orange envelope, black stick representation; directed [PITH_FULL_IMAGE:figures/full_fig_p049_13.png]
Figure 14
Figure 14. Figure 14: FIG. 14. Theoretical harmonic (orange envelope, black stick representation; directed upwards) [PITH_FULL_IMAGE:figures/full_fig_p050_14.png]
Figure 15
Figure 15. Figure 15: FIG. 15. Comparison of theoretical harmonic (envelope and stick representation; directed upwards) [PITH_FULL_IMAGE:figures/full_fig_p054_15.png]
Figure 16
Figure 16. Figure 16: FIG. 16. Theoretical harmonic (brown envelope, black stick representation; directed upwards) and [PITH_FULL_IMAGE:figures/full_fig_p055_16.png]
Figure 17
Figure 17. Figure 17: FIG. 17. Comparison of theoretical harmonic (envelope and stick representation; directed upwards) [PITH_FULL_IMAGE:figures/full_fig_p058_17.png]
Figure 18
Figure 18. Figure 18: FIG. 18. Theoretical harmonic (envelope and stick representation; directed upwards) and anhar [PITH_FULL_IMAGE:figures/full_fig_p059_18.png]
Figure 19
Figure 19. Figure 19: FIG. 19. Comparison of theoretical harmonic (envelope and stick representation; directed upwards) [PITH_FULL_IMAGE:figures/full_fig_p061_19.png]
Figure 20
Figure 20. Figure 20: FIG. 20. Theoretical harmonic (envelope and stick representation; directed upwards) and anhar [PITH_FULL_IMAGE:figures/full_fig_p062_20.png]
Figure 21
Figure 21. Figure 21: FIG. 21. High-resolution IR absorption spectrum of [PITH_FULL_IMAGE:figures/full_fig_p065_21.png]
Figure 22
Figure 22. Figure 22: FIG. 22 [PITH_FULL_IMAGE:figures/full_fig_p073_22.png]
Figure 23
Figure 23. Figure 23: FIG. 23 [PITH_FULL_IMAGE:figures/full_fig_p073_23.png]
Figure 24
Figure 24. Figure 24: FIG. 24. HSQC (CDCl [PITH_FULL_IMAGE:figures/full_fig_p074_24.png]
Figure 25
Figure 25. Figure 25: FIG. 25. CD spectrum (top) and UV/vis absorption spectrum (bottom) of [PITH_FULL_IMAGE:figures/full_fig_p074_25.png]
Figure 26
Figure 26. Figure 26: FIG. 26. ATR-IR spectrum of neat [PITH_FULL_IMAGE:figures/full_fig_p075_26.png]
Figure 27
Figure 27. Figure 27: FIG. 27 [PITH_FULL_IMAGE:figures/full_fig_p077_27.png]
Figure 28
Figure 28. Figure 28: FIG. 28 [PITH_FULL_IMAGE:figures/full_fig_p078_28.png]
Figure 29
Figure 29. Figure 29: FIG. 29 [PITH_FULL_IMAGE:figures/full_fig_p078_29.png]
Figure 30
Figure 30. Figure 30: FIG. 30. HSQC (CDCl [PITH_FULL_IMAGE:figures/full_fig_p079_30.png]
Figure 31
Figure 31. Figure 31: FIG. 31 [PITH_FULL_IMAGE:figures/full_fig_p079_31.png]
Figure 32
Figure 32. Figure 32: FIG. 32. CD spectrum (top) and UV/vis absorption spectrum (bottom) of [PITH_FULL_IMAGE:figures/full_fig_p080_32.png]
Figure 33
Figure 33. Figure 33: FIG. 33. ATR-IR spectrum of neat [PITH_FULL_IMAGE:figures/full_fig_p080_33.png]

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Pith tools

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