Molecules (MDPI) Impact Factor

The practical source boundary is simple: use JCR for the formal JIF, MDPI for the public journal metric package and APC, and SCImago only for secondary Scopus-derived rank context. Do not mix these sources as if they measured the same thing.

In our pre-submission review work with Molecules manuscripts, we see three failure patterns generate the most consistent editor-side returns despite the journal's relatively high acceptance range.

Scope mismatch in a deceptively broad journal. Molecules covers organic chemistry, inorganic chemistry, biochemistry, analytical chemistry, medicinal chemistry, and related fields, but "related fields" has limits. Physics papers that happen to involve molecular systems, materials science papers without molecular-level characterization, or biology papers where chemistry is incidental can be returned for scope mismatch. MDPI uses an academic editor pre-check specifically to assess scope fit before peer review, and this check is not a formality.

The most common scope rejection is papers that are fundamentally materials science, pharmaceutical development, or food science but which include molecular characterization in the methods section. The paper's primary contribution needs to be chemistry, not a field that uses chemical analysis as a supporting tool.

Methodological shortcuts in a soundness-based review model. MDPI and Molecules use a soundness-based review model, meaning papers are evaluated primarily on methodological rigor rather than perceived novelty. This matters for understanding what gets rejected: Molecules will accept an incremental finding if the methodology is complete and the controls are sound; it will reject a potentially interesting finding if the methodology has gaps.

Common rejection triggers are single-experiment conclusions without replication, absent or inadequate negative controls, missing statistical analysis, incomplete characterization of novel compounds (no NMR, MS, or purity data where expected), and analytical methods that are not validated for the reported application. The high acceptance rate reflects the lack of a novelty bar, not the absence of a quality bar.

Preliminary data presented as conclusions. Molecules rejects papers where the data support "further work is needed" conclusions rather than positive, confirmable findings. Pilot studies, feasibility demonstrations, or exploratory work that establishes a hypothesis without testing it are returned with "Reject and Encourage Resubmission" decisions. These are not permanent rejections, the journal explicitly invites resubmission after the work is more fully developed, but they mean the current manuscript is not ready.

If the paper's abstract and conclusion describe what the next experiments should show rather than what the current experiments demonstrate, it needs more data before submission. A Molecules methodology and completeness check can identify whether the methodology, scope fit, and completeness meet Molecules' specific bar.

For the upload package, use the MDPI SuSy submission system and check the live Molecules instructions before final formatting. The page-level number matters less than whether the abstract stays near the expected 200-word limit, the compound characterization is complete, and the submission chooses the right Molecules section or Special Issue.

Molecules fell after the 2021 citation surge, then recovered to 5.1 in the current 2025 JIF, up from 4.6 in the prior metric year. That recovery is useful evidence that the journal's citation base remains durable, but it should not be read as a prestige reset. The practical interpretation is stable mid-tier chemistry visibility inside a high-volume MDPI publishing model.

Use this as a trend guardrail, not as a formal historical JCR substitute. Current submission decisions should anchor on the 2025 JIF, the 5-year JIF, the 10.3 CiteScore, the Q2 JCR category placement, and the manuscript-fit tradeoff rather than on a hand-built historical series.

The 5.1 impact factor tells you Molecules is visible enough that the journal should not be dismissed as obscure. It does not tell you that Molecules carries the same selectivity signal as ACS, RSC, Wiley-VCH, or Nature Portfolio chemistry titles with similar or higher metrics. The number is best read as evidence of platform reach: a high-volume, indexed, open-access chemistry journal can still generate a durable citation average across a very large article base.

For authors, that means the metric helps with one question and misleads on another. It helps when the shortlist is between broad OA chemistry venues and the paper's real need is speed, indexing, and accessible readership. It misleads when the author is trying to use the JIF to offset MDPI perception concerns, weak novelty, incomplete characterization, or a paper that would clearly benefit from a specialist chemistry audience.

In our manuscript-fit reviews, the strongest Molecules candidates are not the ones that merely point to the 5.1 JIF. They are the ones where the abstract explains a concrete molecular-science contribution, the methods and supplementary information prove the chemistry cleanly, and the authors can explain why broad MDPI OA helps this paper more than a narrower ACS, RSC, Elsevier, or Wiley venue. The JIF supports that argument only after the manuscript itself makes the fit credible.

For Molecules, the page should help the author answer a practical tradeoff question rather than repeat the quartile. The real decision is whether the manuscript is better served by fast open-access publication in a very broad MDPI journal or by a more selective chemistry venue with a clearer community signal. That is the choice most authors are actually making when Molecules appears on the shortlist.

The metric matters because 5.1 is strong enough that the journal cannot be dismissed as invisible. But the journal's enormous scope and publisher model mean the number should be read alongside editorial selectivity, article volume, APC expectations, and how the field reads MDPI-brand chemistry papers. A decent JIF does not automatically make the journal the best home for every solid chemistry manuscript.

Another way to frame the decision is audience intent. If the paper needs immediate open-access availability, broad indexing, and a realistic path to publication, Molecules can be pragmatic. If the paper needs a journal name that itself carries stronger prestige in organic chemistry, medicinal chemistry, or natural products, the page should tell the reader that more selective options may be worth the extra risk.

The journal's citation profile has stayed good enough to keep Molecules clearly visible in multidisciplinary chemistry, but the trend is most useful as a signal of stable platform value rather than elite editorial standing. That distinction matters. Authors comparing Molecules with ACS Omega, RSC Advances, or stronger specialty journals should interpret the metric as proof of discoverability, not proof of top-tier field endorsement.

Molecules tends to make the most sense when the paper sits in a crowded middle band: publishable chemistry, sound methods, decent novelty, but not the kind of selective field-defining result that benefits from spending months testing a harder journal ladder. That can be especially true for medicinal chemistry support studies, natural-products characterization, synthetic workflows with limited conceptual reach, or cross-cutting molecular work that does not belong cleanly to one subfield title.

In those cases, the journal's breadth can actually be an advantage. A broad molecular-science venue can expose the paper to readers outside one micro-community, and the open-access model lowers access friction. But that benefit only matters if the authors are intentionally choosing speed and breadth. If they are choosing the journal because it looks easier while still wanting the signal of a higher-prestige chemistry title, the page should make clear that those are different outcomes.

The impact factor does not tell you how the paper will be read by hiring committees that distinguish sharply between MDPI and society publishers. It does not tell you whether reviewers in your exact chemistry subfield will regard the journal as a serious first-choice venue. And it does not erase the fact that, in many chemistry areas, journal identity still carries strong social meaning beyond citation averages.

That is why the right use of this page is not to ask whether 5.1 is "good enough" in the abstract. It is to ask whether the combination of moderate citation performance, fast handling, open access, and MDPI branding matches the paper's actual needs.

For authors making an honest shortlist, that extra clarity matters more than the raw quartile label because it separates a convenient outlet from a strategically strong fit.

• It helps when the manuscript needs broad chemistry visibility and fast open-access handling.

• It helps when the realistic comparison set is other broad-access chemistry journals rather than flagship titles.

• It misleads when the paper would benefit much more from a specialty journal with a clearer community identity.

• It misleads when authors treat a respectable JIF as proof that the MDPI tradeoff no longer matters.

• Molecules submission guide

• Molecules submission process

• Molecules editorial-return guide

• Is Molecules a good journal?

At 5.1 JIF with 5,000+ accepted papers per year and an MDPI Q2 ranking, Molecules occupies a clearly defined tradeoff space: speed, broad chemistry scope, and full open access in exchange for substantially weaker selectivity than ACS, Wiley, or RSC chemistry alternatives. The 5.1 number is the citation average across a large mixed-quality corpus. Comparing Molecules to specialty chemistry journals like Organometallics (2.4) or Inorganic Chemistry (4.6) on IF alone obscures that the three operate under fundamentally different review and publishing regimes.

What 5.1 does not signal about a Molecules submission: editorial scrutiny varies materially across the journal's Special Issue program and the regular track, and review depth varies by subtopic guest-editor expertise. The friction submissions are papers where the work is solid but where editorial board interest in the specific niche is thin. Subfield prestige in Molecules concentrates in synthetic-methodology, natural-product chemistry, and computational drug-discovery subtopics.

Before submitting, a Molecules submission readiness check can assess whether your manuscript fits the journal's actual editorial scope and completeness bar.

If the concern is whether a chemistry paper is complete enough for Molecules' soundness-based review model, review sample Manusights reports before you finalize.