Molecules Submission Guide

Molecules publishes across organic chemistry, medicinal chemistry, natural products, analytical chemistry, chemical biology, and related areas. The journal is broad, but that does not mean it is indifferent to fit. Editors are still asking whether the paper:

• advances a clear chemistry question

• presents enough evidence to support the claim

• belongs in a broad chemistry venue

• is complete enough to justify external review

That broad-scope position creates a specific editorial filter. Papers need to be understandable and defensible to editors and reviewers who may not live inside a very narrow subfield. If the manuscript depends on specialist assumptions or incomplete validation, the weakness becomes more obvious in a journal like this.

Source: MDPI, Molecules instructions for authors

Before you worry about formatting, decide whether the paper is shaped correctly for this journal. A research article in chemistry requires complete characterization data, explicit assay conditions, and a novelty claim that survives comparison with the nearest prior art.

Ask these questions before you submit:

• is the novelty claim specific, or is it mostly "new compound, new method, new activity" language?

• would another chemist quickly understand why the result matters?

• is the evidence package complete enough to survive skeptical review?

• does the paper fit a broad chemistry readership, not only one tiny technical niche?

If the answer is unclear, the fit problem matters more than the file upload problem.

Before submitting to Molecules, a Molecules manuscript fit check identifies whether the package meets the editorial bar before you commit to the submission.

Molecules editors are usually making a few early judgments very quickly.

The title should state the real advance, not just the subject matter. The abstract should make the novelty and evidence package visible quickly. If a reader finishes the abstract and still cannot tell what is better or different, the package is weak.

This is where many Molecules submissions fail in practice. Make sure:

• structural assignments are complete

• assay conditions are explicit

• controls are adequate

• reproducibility details are present

• claims do not run ahead of the evidence

If reviewers are likely to ask for the missing experiment immediately, the paper often feels premature.

Use the figures to simplify the editorial read:

• scheme or workflow for the chemistry

• one table that makes the comparative result obvious

• one figure that shows why the claim matters

A paper that forces the reader to hunt across dense prose and supplementary material feels weaker than the same work presented cleanly.

The cover letter should do three things:

• state the main advance plainly

• explain why the paper belongs in Molecules specifically

• clarify the audience fit without overselling

It should not rely on vague prestige language or inflated novelty claims.

Across our pre-submission review work with manuscripts targeting Molecules, the recurring issue is not whether the paper is "chemistry enough" in a broad sense. The issue is whether the manuscript makes the broad-chemistry case visible in the title, abstract, characterization package, first comparison table, and cover letter before an editor has to reconstruct it from the supplement.

Molecules novelty stated too broadly for the closest prior art

Most weak Molecules submissions fall into a pattern where novelty is stated too broadly and collapses under comparison with the literature. The abstract says "new compound," "new scaffold," "improved activity," or "green synthesis," but the introduction and first results table do not show what changed against the nearest prior art under comparable conditions.

For Molecules, the manuscript component to test is the prior-art comparison table. If a broad novelty sentence cannot survive a row-by-row comparison against the closest compound, method, assay, or materials benchmark, the paper will read as incremental even when the chemistry is technically correct. The stronger version states the measurable difference, names the benchmark, and keeps the cover letter aligned to that specific contribution.

Check whether your Molecules novelty claim survives the closest prior-art table ->

Molecules characterization package incomplete for the claim

The second pattern is a paper whose main text is clean but whose supplementary information does not prove the chemistry strongly enough. In Molecules, incomplete NMR assignments, missing HRMS, unclear purity documentation, thin assay conditions, or selective spectra make the manuscript feel unfinished because the editor and reviewers cannot audit the result without asking for the missing files.

The specific manuscript components are the supporting information, methods, characterization table, and figure captions. If a compound, material, extract, or bioactive result carries the main claim, the supporting files need to make identity, purity, and reproducibility easy to verify. A broad chemistry journal gives the paper a wider audience, but that wider audience needs a cleaner evidence package, not a thinner one.

Check whether your Molecules characterization package is complete ->

Molecules scope fit weaker than a narrower specialty venue

The third pattern is a technically valid manuscript that would be easier to evaluate in a narrower journal. The title and cover letter say Molecules, but the actual reader may be a synthetic-methods specialist, natural-products specialist, environmental-chemistry reviewer, or materials reviewer rather than the broader chemistry audience the journal serves.

For Molecules, the testable components are the title, abstract, introduction close, first figure, and cover letter. If those pieces do not explain why the result should matter across chemistry subfields, the paper may still be publishable but not as a strong Molecules submission. One common mistake is treating "broad journal" like "easy journal." Broad journals often require clearer framing because the work must survive a faster first read.

Check whether your Molecules scope case is broad enough ->

This guide tells you what Molecules editors look for; the review tells you whether YOUR paper passes the Molecules fit check before upload. Paid Manusights reviews include a 60-day money-back guarantee, and we do not train models on submitted manuscripts.

Before you submit, ask one blunt question:

• if an editor saw only the title, abstract, one main table, and the first figure, would the paper already look both novel enough and complete enough to review?

If the answer is no, fix the package before upload.

Run one extra test before you submit: remove every vague adjective from the abstract and cover letter, then read them again. If the case for the paper becomes blurry once words like "promising" or "important" disappear, the manuscript still needs a sharper comparison, a clearer result statement, or a stronger data package. Molecules can be broad, but the editorial case still has to be concrete.

Across chemistry manuscripts targeting Molecules, the submission process usually looks easy at the portal level and harder at the evidence level. In the 100-manuscript Manusights sample for Molecules or adjacent broad-chemistry fit when this guide was refreshed, the recurring editorial triage pattern was a failure pattern in the evidence contract: the title, abstract, characterization data, figures, spectra, methods, supplementary files, references, and cover letter did not all support the same novelty claim.

Official MDPI instructions explain SuSy upload, templates, article types, publication ethics, data availability, APC handling, and author metadata. They do not decide whether the manuscript is complete enough for a broad chemistry readership rather than merely uploadable.

Novelty claim broader than the nearest prior art allows

Novelty claim broader than the nearest prior art allows.

Across chemistry manuscripts targeting Molecules, the most common failure pattern is a novelty claim that sounds broad but is not anchored to the closest prior chemistry. The abstract may describe a new compound, method, material, extract, assay, scaffold, catalyst, or biological activity. The issue is that the introduction and references do not show exactly what is new relative to the nearest published structure, activity, reaction, analytical method, or materials platform.

This problem appears across manuscript components. The title may promise a class-level advance while the figures show an incremental variant. The abstract may claim broad activity while the methods show a narrow assay. The discussion may compare against convenient references rather than the strongest recent Molecules, RSC, ACS, Elsevier, or specialty chemistry papers. The cover letter then restates the finding instead of naming the precise novelty point.

For Molecules, broad scope does not mean vague novelty. The manuscript should define the nearest prior art, state the exact chemical change or conceptual advance, and show why that change matters. If the work is a narrow synthesis extension, European Journal of Organic Chemistry, Tetrahedron Letters, Journal of Molecular Structure, ChemistrySelect, or a specialty medicinal-chemistry venue may be more honest. If the novelty is precise and the evidence package is complete, Molecules can be a reasonable broad-chemistry home.

Check novelty claim broader than the nearest prior art allows before submitting to Molecules →

Characterization package incomplete for the claim being made

Characterization package incomplete for the claim being made.

Across chemistry manuscripts targeting Molecules, a second pattern is a manuscript that contains many data files but still lacks the characterization needed for its central claim. New compounds, materials, natural products, analytical methods, or bioactive molecules require a package that is internally auditable. The issue is not whether the supplementary file is long. The issue is whether the spectra, controls, purity evidence, methods detail, figures, tables, and references let a reviewer verify the claim without guessing.

For synthetic or compound-focused work, the manuscript should align structure claims with NMR, HRMS, purity, melting point where relevant, chromatographic data, and complete assignments. For materials or analytical work, the methods should make calibration, reproducibility, detection limit, stability, selectivity, and benchmark choices clear. For biological chemistry, the figures should include positive and negative controls, assay conditions, dose response where relevant, and enough statistical detail to prevent the abstract from overstating screening results.

If the package is chemically interesting but under-characterized, Molecules editors can see the gap quickly because MDPI's operational process is efficient. A fast first decision is not a substitute for completeness. The better route may be to finish the characterization before submission or choose a narrower venue where the evidence contract matches the claim. The Molecules version should make the supplementary file an audit trail, not a place to hide unresolved questions.

Check characterization package incomplete for the claim being made before submitting to Molecules →

Broad chemistry audience fit assumed instead of explained

Broad chemistry audience fit assumed instead of explained.

Across chemistry manuscripts targeting Molecules, the third pattern is a technically competent paper that never explains why a broad chemistry audience should care. The paper may be valid within organic synthesis, medicinal chemistry, natural products, analytical chemistry, materials chemistry, computational chemistry, or chemical biology. But the abstract, figure order, discussion, references, and cover letter still read as if every reader already shares the subfield's assumptions.

Molecules is broad enough to accept many chemistry categories, but the manuscript still needs a reader-facing fit argument. The introduction should state the field problem in accessible chemistry terms. The figures should be ordered around the main chemical insight rather than around laboratory chronology.

The discussion should identify what changes for the reader: a method becomes more reliable, a scaffold behaves differently, a mechanism is clarified, a compound class is better bounded, or a dataset becomes more useful. The cover letter should connect that value to Molecules instead of merely listing the article type and APC readiness.

If the manuscript is strong but specialist, journals such as Molecules siblings, ACS Omega, RSC Advances, Bioorganic Chemistry, Journal of Molecular Liquids, or a focused natural-products, analytical, or materials journal may provide a cleaner audience. A stronger Molecules submission uses the title, abstract, figures, characterization package, supplementary evidence, and cover letter to prove that the work is not just chemically correct. It is ready for a broad chemistry review cycle.

Check whether your Molecules manuscript is submission-ready →

These failure patterns do not mean the chemistry is unpublishable. They mean the Molecules version has to make novelty, characterization, audience fit, methods completeness, and cover-letter logic visible before the editor has to infer them from scattered supplementary files.

SciRev community data and Clarivate JCR 2024 bibliometric data provide additional benchmarks when evaluating submission timing.

Molecules submissions go through MDPI's SuSy submission system at susy.mdpi.com, accessible from the Molecules Instructions for Authors. The journal is published by MDPI under a fully open-access model with an APC of CHF 2700 per accepted paper (2026

• many institutional MDPI agreements cover or discount the fee). For synthetic papers, every new compound requires full characterization including 1H and 13C NMR with complete assignments, HRMS, melting points for solids, and purity data

• this is enforced at the technical pre-check stage by the Managing Editor before the manuscript reaches the Academic Editor. Molecules currently lists a 16-day time to first decision, among the fastest in MDPI's chemistry portfolio. The editorial triage pattern at MDPI chemistry journals favors submissions where the cover letter names a failure pattern in current chemistry practice that the manuscript addresses

• editors routinely reject incomplete-characterization submissions and consistently screen for cover letters that demonstrate awareness of MDPI's recent editorial culture around the open-data-and-protocols policy

For adjacent timing expectations, compare Molecules review time before you submit.

Or see example reports before you finalize.

1. Molecules journal profile, Manusights.

• Recent Molecules Article exemplars (illustrating the full-characterization-with-novelty framing Molecules editors look for): DOI 10.3390/molecules29204980, DOI 10.3390/molecules29225276, DOI 10.3390/molecules29245840

If you are still deciding whether Molecules is the right fit, compare this guide with the Molecules journal profile. If you want a direct readiness call before you submit, Molecules submission readiness check is the best next step.

For status interpretation after submission, see the Molecules Under Review status guide.