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Synthesis and Chemotherapy Applications of Platinum Group Metal Organometallic Compounds

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Organic Chemistry".

Deadline for manuscript submissions: 28 February 2025 | Viewed by 253

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Department of Inorganic Chemistry, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
Interests: macrocyclic; organometallic chemistry; macrocyclic ligand; metal complexes; synthesis, structure, and properties of organometallic complexes
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Special Issue Information

Dear Colleagues,

The C-H activation of an organic ligand that led to the cyclometallation reaction was first reported by Cope and Siekman in 1965. This was the cornerstone facilitated the activation of aromatic C-H bonds by transition metals, an issue which has substantially advanced organometallic chemistry, particularly metallacycles. Many metals, inclusive of main group metals, and ligands have been used to produce this type of compound. Regarding palladium and platinum, the resulting complexes are termed palladacycles and platinacycles. They show interesting features related to their structure and reactivity patterns. However, it is their applications that have given them remarkable importance in modern organometallic chemistry, such as their use as phosphorescent compounds, metallomesogens, catalysts, in synthetic chemistry to functionalize aromatic carbon atoms, and as antineoplastic species. It is the latter aspect that is addressed in this Special Issue by considering the corresponding palladium, platinum metallacycles, and related platinum group metal complexes.

Prof. Dr. José Manuel Vila Abad
Guest Editor

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Keywords

  • palladacycles
  • platinacycles
  • thiosemicarbazones
  • iminophosphoranes
  • Schiff bases
  • crystal structure
  • bioactivity assays
  • cytostatic activity

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Published Papers (1 paper)

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Research

12 pages, 2263 KiB  
Article
Breaking New Ground towards Innovative Synthesis of Palladacycles: The Electrochemical Synthesis of a Tetranuclear Thiosemicarbazone-[C,N,S] Palladium(II) Complex
by María L. Durán-Carril, José Ignacio Fidalgo-Brandón, David Lombao-Rodríguez, Paula Munín-Cruz, Francisco Reigosa and José M. Vila
Molecules 2024, 29(17), 4185; https://doi.org/10.3390/molecules29174185 - 4 Sep 2024
Viewed by 136
Abstract
The electrochemical oxidation of anodic metals (M = nickel and palladium) in an acetonitrile solution of the thiosemicarbazone ligands (E)-2-(1-(4-methoxyphenyl)ethylidene)-N-methylhydrazine-1-carbothioamide (a), (E)-2-(1-(p-tolyl)ethylidene)hydrazine-1-carbothioamide (b), and (E)-N-phenyl-2-(1-(p-tolyl)ethylidene)hydrazine-1-carbothioamide (c) yielded the homoleptic complexes [ML2], 1a, 1b, [...] Read more.
The electrochemical oxidation of anodic metals (M = nickel and palladium) in an acetonitrile solution of the thiosemicarbazone ligands (E)-2-(1-(4-methoxyphenyl)ethylidene)-N-methylhydrazine-1-carbothioamide (a), (E)-2-(1-(p-tolyl)ethylidene)hydrazine-1-carbothioamide (b), and (E)-N-phenyl-2-(1-(p-tolyl)ethylidene)hydrazine-1-carbothioamide (c) yielded the homoleptic complexes [ML2], 1a, 1b, 1c, and 2c and [M4L4], 2a as air-stable solids. The crystal structures for 1a, 1b, 1c, and 2c show the ligands in a transoid disposition with the [S,S] and [N,N] donor atom pairs occupying cis positions on the nearly square planar coordination plane of the metal. The structure for 2a of S4 symmetry comprises a tetranuclear palladacycle where the metalated ligands are arranged around a central Pd4S4 environment: a crown ring with alternating palladium and sulfur atoms. The latter complex is the first example of an electrochemical preparation of a cyclometalated palladium compound, marking a milestone in the chemistry of such species. The compounds have been fully characterized by elemental microanalysis, mass spectrometry, infrared (IR), and 1H nuclear magnetic resonance (NMR) spectra. Full article
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