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Based on various comparable salen ligands, three synthesized CuIINaI-complexes present efficient catalytic activities for the coupling and cyclization reaction of 1,2-diaminopropane with nitriles towards 2-imidazolines. The catalytic results show that salen ligands with an electron-donating substituent and small steric hindrance improve the catalytic activity.
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http://dx.doi.org/10.1039/c9cc00879a | DOI Listing |
Catal Sci Technol
September 2025
EaStCHEM School of Chemistry, University of Edinburgh EH9 3FJ UK
The ring-opening polymerisation (ROP) of lactide (LA) is an attractive route to produce aliphatic polyesters, with bimetallic catalysts displaying some of the highest catalyst activities to date. While a range of heterometallic catalysts have been reported to outperform their homometallic analogues, the origins of cooperativity are not always well understood. Previous studies indicate that the reaction pathways may differ for different metal heterocombinations, especially when an alkali metal is combined with zinc or aluminium.
View Article and Find Full Text PDFDalton Trans
August 2025
Department of Chemistry, Indian Institute of Technology Jodhpur, Rajasthan-342030, India.
In this study, we report the synthesis and structural characterization of dinuclear aluminum complex 1, containing redox-active bis-catecholaldimine ligand 6,6'-{[ethane-1,2-diylbis(azanylidene)]bis(methanylidene)}-bis(3,5-di--butyl-1,2-dihydroxybenzene) (LH). Complex 1 was readily obtained by refluxing LH and Al(NO)·9HO in 3 : 2 molar ratio in the presence of triethylamine in a methanolic solution. Single-crystal X-ray diffraction analysis of complex 1 showed that catecholaldimine ligands bound octahedral coordination to each of the two Al(III) centers.
View Article and Find Full Text PDFR Soc Open Sci
July 2025
Department of Inorganic Polymers, 'Petru Poni' Institute of Macromolecular Chemistry, Iasi, Romania.
A complex of Co(II), , with a salen-type Schiff base ligand, , having a siloxane spacer, was evaluated from the perspective of anti-cancer activity in comparison with a newly synthesized homologue under similar conditions, , but with a ligand with hexamethylene bridge, . Molecular docking simulations were used to estimate the possible interactions of the two cobalt complexes and their parent ligands with some key proteins involved in cancer development, the results indicating that the silicon derivatives are more potent anti-tumours. This is attributed to the conformational flexibility of the siloxane segment that favours establishing interactions with biological targets.
View Article and Find Full Text PDFPhys Chem Chem Phys
July 2025
V.A. Fock Institute of Physics, St. Petersburg State University, 7/9 Universitetskaya nab., 199034 Saint Petersburg, Russia.
The atomic-electronic structure of the [NiON] coordination center in the [Ni(Salen)] complex and its polymer was studied using X-ray absorption spectroscopy (EXAFS and NEXAFS) techniques, supplemented by quantum chemical calculations. Density functional theory (DFT) calculations were performed to construct the initial models of the [Ni(Salen)] complex and identify structural fragments of the poly-[Ni(Salen)] polymer that determine its properties in both reduced (Red) and oxidized (Ox) states. Based on the analysis of the Ni 1s EXAFS spectra, a d-d dimer model was found to best describe the structure and properties of the complex in the condensed state and can also be used as a simplified model for the polymer.
View Article and Find Full Text PDFChemistryOpen
September 2025
Department of Physics, Faculty of Science, Port Said University, Port Said, 42521, Egypt.
Transition metal complexes are considered a significant treatment for cancer diseases because of their efficacy toward cancer cells. However, most of these compounds have limited potential toward cancer cells due to their organic backbone structure. Here, the synthesis and anticancer screening of three different ligand structures of salen copper(II) complexes are reported: [Cu(salophen)(HO)] (1), [Cu(salen)(HO)] (2), and [Cu(etho-salen)(HO)] (3).
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