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Molecules is a peer-reviewed open access scientific journal that focuses on all aspects of chemistry and materials science. It was established in March 1996 and is published monthly by MDPI . From 1997 to 2001, Molbank was published as a section of the journal, before splitting into its own journal.
The impact factor relates to a specific time period; it is possible to calculate it for any desired period. For example, the JCR also includes a five-year impact factor, which is calculated by dividing the number of citations to the journal in a given year by the number of articles published in that journal in the previous five years. [14] [15]
The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science.
The SCImago web site [9] gives both the SJR and H index, and the results are quite different. Here are the journals ranking in the top three for each of the metrics. Here are the journals ranking in the top three for each of the metrics.
Top quartile citation count (TQCC) – reflecting the number of citations accrued by the paper that resides at the top quartile (the 75th percentile) of a journal's articles when sorted by citation counts; for example, when a journal published 100 papers, the 25th most-cited paper's citation count is the TQCC.
[8] Moreover, studies of methodological quality and reliability have found that "reliability of published research works in several fields may be decreasing with increasing journal rank", [9] contrary to widespread expectations. [10]
While these journals still did not receive an impact factor until the next year, they did contribute citations to the calculation of other journals' impact factors. [ 4 ] [ 5 ] In July 2022, Clarivate announced that journals in the ESCI obtain an impact factor effective from JCR Year 2022 first released in June 2023.
Prior to 1998, this journal was named Zeitschrift für Physik D: Atoms, Molecules and Clusters. Until 2003, Ingolf Hertel was the editor-in-chief of EPJ D. From May 2003 on EPJ D had two editors-in-chief: Tito Arecchi and Jean-Michel Raimond. In January 2004, Arecchi stepped down and Franco A. Gianturco took over his position.