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Catalysts
Special Issues
Synthetic Coordination and Organometallic Chemistry
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Synthetic Coordination and Organometallic Chemistry

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalysis in Organic and Polymer Chemistry".

Deadline for manuscript submissions: 15 June 2026 | Viewed by 893

Special Issue Editor

Prof. Dr. Carl Redshaw

E-Mail Website
Guest Editor
Department of Chemistry, Tokyo Metropolitan University, Tokyo, Japan
Interests: calixarenes; coordination chemistry’ catalysis; polymers; imaging and anti-cancer agents
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In metal-based polymerization processes, the choice of ligand bound at the metal, even within the same family of ligand types, can greatly influence the outcome of the process. Subtle changes in the sterics and/or the electronics associated with the ligand can have dramatic effects on both the catalytic activity of the system and the properties of the resultant products. With this in mind, we are pleased to invite you to publish your latest synthetic ligand designs, the resulting catalysts/catalysis, and the impact of these ligands on the catalytic process of your choice. Alternatively, we are happy to receive submissions related to known ligands but which are applied in new ways to enhance catalytic processes. Both homogeneous and heterogeneous systems are welcome.

We are particularly interested in the design of new potential ligand systems as well as how ligand varation at the metal can impact upon catalytic performance and polymer properties. The catalysis can be in, but is not limited to, areas such as polyolefins, or greener processes e.g. ring opening homo-/co-polymerizations.

I look forward to receiving your contributions.

Prof. Dr. Carl Redshaw
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • coordination chemistry
  • organometallic chemistry
  • ligand design
  • catalyst design
  • inorganic
  • organic

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Published Papers (1 paper)

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Research

21 pages, 1823 KB  
Article
Bi-Dentate Pyridyl Alkoxide Complexes of Aluminium and Vanadium: Synthesis, Structure and ROP Capability
by Shunsuke Sato, Ignas Motuzis, Mark R. J. Elsegood, Kotohiro Nomura and Carl Redshaw
Catalysts 2026, 16(3), 259; https://doi.org/10.3390/catal16030259 - 13 Mar 2026
Viewed by 583
Abstract
The reaction of the pyridylalcohol Ph2C(OH)CH2-2-py-6-Me (IH) with Me3Al in refluxing toluene led to the isolation of the dimer [AlMe2(μ-OC(Me)Ph2)]2 (1), whilst at ambient temperature the complex [( [...] Read more.
The reaction of the pyridylalcohol Ph2C(OH)CH2-2-py-6-Me (IH) with Me3Al in refluxing toluene led to the isolation of the dimer [AlMe2(μ-OC(Me)Ph2)]2 (1), whilst at ambient temperature the complex [(I)AlMe2]·MeCN (2·MeCN) was isolated. Complex 1 is also readily available via the interaction of diphenylethanol and Me3Al. Similar treatment of iPr2C(OH)CH2-2-py-6-Me (IIH) at ambient temperature afforded [(II)AlMe2] (3). Treatment of IH and IIH with [VO(OiPr)3] led to oxo-bridged complexes of the type [(VO)(μ2-O)(I/II)]2 (I (4·0.67MeCN), II (5)). The molecular structures of 1–5 are reported. These complexes have been employed as catalysts for the ring-opening polymerization (ROP) of the cyclic esters ε-caprolactone (ε-CL) and δ-valerolactone (δ-VL). For aluminium, complex 1/BnOH produced medium- to high-molecular-weight (Mn) PCL at 20 to 110 °C in solution, though some bi-/multi-modal behaviour was observed; for melts the Mn values were toward the lower end. For complexes 2 and 3, far lower Mn values for PCL were observed at 20 °C in solution and as melts, whilst in solution at 110 °C higher Mn values were achieved, though with less control. In general, Mn values for the PCL obtained using the vanadium complexes were low (≤8560 Da for 4, ≤2920 Da for 5). In the case of PVL, 1/BnOH in solution exhibited higher Mn values at lower temperatures with good control, and when employed as a melt, the Mn was toward the higher end (30,830 Da) observed. For 2/BnOH, much lower Mn values (≤2740 Da) were recorded both in solution and as a melt, whilst for 3, high Mn values were only observed in the absence of BnOH. Low Mn values (≤2920 Da) were also observed for the vanadium complexes 4 and 5. Kinetic results (both ε-CL and δ-VL) revealed that the vanadium complexes, particularly 4, outperformed the aluminium complexes. MALDI-ToF spectra revealed the formation of linear PCL polymers with BnO/H end groups for the aluminium/BnOH complexes in solution, and cyclic polymers when employed as melts. For vanadium, cyclic PCL polymers were the major family present. In the case of PVL, linear (BnO/H end groups) and cyclic polymers were observed when employing the Al/BnOH systems, whilst cyclic polymers were observed for vanadium. Copolymerization of ε-CL and δ-VL using 4/BnOH at 110 °C over 24 h led to incomplete conversion and formation of a random-type copolymer. Full article
(This article belongs to the Special Issue Synthetic Coordination and Organometallic Chemistry)
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