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- Title
Tetranuclear Copper(II) Complexes with Macrocyclic and Open-Chain Disiloxane Ligands as Catalyst Precursors for Hydrocarboxylation and Oxidation of Alkanes and 1-Phenylethanol.
- Authors
Zaltariov, Mirela‐Fernanda; Alexandru, Mihaela; Cazacu, Maria; Shova, Sergiu; Novitchi, Ghenadie; Train, Cyrille; Dobrov, Anatolie; Kirillova, Marina V.; Alegria, Elisabete C. B. A.; Pombeiro, Armando J. L.; Arion, Vladimir B.
- Abstract
Two new tetranuclear copper(II) complexes [Cu4(μ4-O)( L1)Cl4] ( 1) and [Cu4(μ4-O)( L2)2Cl4] ( 2), where H2L1 is a macrocyclic ligand resulting from [2+2] condensation of 2,6-diformyl-4-methylphenol (DFF) and 1,3-bis(aminopropyl)tetramethyldisiloxane, and HL2 is a 1:2 condensation product of DFF with trimethylsilyl p-aminobenzoate, have been prepared. The structures of the products were established by X-ray diffraction. The complexes have been characterised by FTIR, UV/Vis spectroscopy, ESI mass-spectrometry and magnetic susceptibility measurements. The latter revealed that the tetranuclear complexes can be described as two ferromagnetically coupled dinuclear units, in which the two copper(II) ions interact antiferromagnetically. The compounds act as homogeneous catalyst precursors for a number of single-pot reactions, including (i) hydrocarboxylation, with CO, H2O and K2S2O8, of a variety of linear and cyclic( n = 5-8) alkanes into the corresponding C n+1 carboxylic acids, (ii) peroxidative oxidation of cyclohexane, and (iii) solvent-free microwave-assisted oxidation of 1-phenylethanol.
- Subjects
COPPER compounds; LIGANDS (Chemistry); CATALYSTS; CARBOXYLATION; OXIDATION of alkanes
- Publication
European Journal of Inorganic Chemistry, 2014, Vol 2014, Issue 29, p4946
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201402578