{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,11]],"date-time":"2025-11-11T12:52:49Z","timestamp":1762865569258},"reference-count":40,"publisher":"Walter de Gruyter GmbH","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2009,6,30]]},"abstract":"<jats:p>Salen complexes are a versatile and standard system in oxidation catalysis. Their reduced derivatives, called salan, share their versatility but are still widely unexplored. We report the synthesis of a group of new vanadium-salen and -salan complexes, their characterization and application in the oxidation of simple organic molecules with H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub>. The ligands are derived from pyridoxal and chiral diamines (1,2-diaminocyclohexane and 1,2-diphenylethylenediamine) and were easily obtained in high yields. The V<jats:sup>IV<\/jats:sup> complexes were prepared and characterized in the solid state (Fourier transform infrared, FTIR, and magnetic properties) and in solution by spectroscopic techniques: UV\u2013vis, circular dichroism (CD), electron paramagnetic resonance (EPR), and <jats:sup>51<\/jats:sup>V NMR, which provide information on the coordination geometry. Single crystals suitable for X-ray diffraction studies were obtained from solutions containing the V<jats:sup>IV<\/jats:sup>-pyr(<jats:italic>S<\/jats:italic>,<jats:italic>S<\/jats:italic>-chan) complex: [V<jats:sup>V<\/jats:sup>O{pyr(<jats:italic>S<\/jats:italic>,<jats:italic>S<\/jats:italic>-chen)}]<jats:sub>2<\/jats:sub>(\u03bc-O)<jats:sub>2<\/jats:sub>\u00b72(CH<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub>NCHO, where the ligand is the \u201chalf\u201d Schiff base formed by pyridoxal and 1<jats:italic>S<\/jats:italic>,2<jats:italic>S<\/jats:italic>-diaminocyclohexane. The dinuclear species shows a OV<jats:sup>V<\/jats:sup>(\u03bc-O)<jats:sub>2<\/jats:sub>V<jats:sup>V<\/jats:sup>O unit with tridentate ligands and two \u03bc-oxo bridges. The V<jats:sup>IV<\/jats:sup> complexes of the salan-type ligands oxidize in organic solvents to a V<jats:sup>V<\/jats:sup> species, and the process was studied by spectroscopic techniques. The complexes were tested as catalysts in the oxidation of styrene, cyclohexene, and cumene with H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> as oxidant. Overall, the V-salan complexes show higher activity than the parent V-salen complexes and are an alternative ligand system for oxidation catalysis.<\/jats:p>","DOI":"10.1351\/pac-con-08-09-07","type":"journal-article","created":{"date-parts":[[2009,7,16]],"date-time":"2009-07-16T16:04:35Z","timestamp":1247760275000},"page":"1279-1296","source":"Crossref","is-referenced-by-count":60,"title":["Vanadium-salen and -salan complexes: Characterization and application in oxygen-transfer reactions"],"prefix":"10.1515","volume":"81","author":[{"given":"Pedro","family":"Ad\u00e3o","sequence":"first","affiliation":[{"name":"1Centro Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, TU Lisbon, Av. Rov\u00edsco Pais, 1049-001 Lisbon, Portugal"}]},{"given":"Mannar R.","family":"Maurya","sequence":"additional","affiliation":[{"name":"2Department of Chemistry, Indian Institute of Technology, Roorkee 247667, India"}]},{"given":"Umesh","family":"Kumar","sequence":"additional","affiliation":[{"name":"2Department of Chemistry, Indian Institute of Technology, Roorkee 247667, India"}]},{"given":"Fernando","family":"Avecilla","sequence":"additional","affiliation":[{"name":"3Departamento de Qu\u00edmica Fundamental, Universidade da Coru\u00f1a, Campus da A Zapateira, 15071, A Coru\u00f1a, Spain"}]},{"given":"Rui T.","family":"Henriques","sequence":"additional","affiliation":[{"name":"1Centro Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, TU Lisbon, Av. Rov\u00edsco Pais, 1049-001 Lisbon, Portugal"}]},{"given":"Maxim L.","family":"Kusnetsov","sequence":"additional","affiliation":[{"name":"1Centro Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, TU Lisbon, Av. Rov\u00edsco Pais, 1049-001 Lisbon, Portugal"}]},{"given":"Jo\u00e3o","family":"Costa Pessoa","sequence":"additional","affiliation":[{"name":"1Centro Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, TU Lisbon, Av. Rov\u00edsco Pais, 1049-001 Lisbon, Portugal"}]},{"given":"Isabel","family":"Correia","sequence":"additional","affiliation":[{"name":"1Centro Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, TU Lisbon, Av. 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