Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4950
Título: Mu-Chlorido-Bridged Dimanganese(II) complexes of the schiff base derived from [2+2] condensation of 2,6-diformyl-4-methylphenol and 1,3-bis(3-aminopropyl)tetramethyldisloxane: structure, magnetismo, electrochemical behaviour, and catalytic oxidation of secondary alcohols
Autor: Alexandru, Mihaela
Cazacu, Maria
Arvinte, Adina
Shova, Sergiu
Turta, Constantin
Simionescu, Bogdan C.
Dobrov, Anatolie
Alegria, Elisabete Clara Bastos do Amaral
Martins, Luísa Margarida D. R. S.
Pombeiro, Armando J. L.
Arion, Vladimir B.
Palavras-chave: Manganese
Template Synthesis
Macrocycles
Schiff Bases
Oxidation
Data: Jan-2014
Editora: Wiley-V C H Verlag GMBH
Citação: ALEXANDRU, Mihaela; [et al] – Mu-Chlorido-Bridged Dimanganese(II) Complexes of the schiff base derived from [2+2] condensation of 2,6-Diformyl-4-Methylphenol and 1,3-Bis(3-Aminopropyl)Tetramethyldisloxane: Structure, magnetismo, electrochemical behaviour, and catalytic oxidation of secondary alcohols. European Journal of Inorganic Chemistry. ISSN: 1434-1948. Vol. 2014, nr. 1 (2014), pp. 120-131.
Resumo: The reaction of 2,6-diformyl-4-methylphenol with 1,3-bis(3-aminopropyl)tetramethyldisiloxane in the presence of MnCl2 in a 1:1:2 molar ratio in methanol afforded a dinuclear -chlorido-bridged manganese(II) complex of the macrocyclic [2+2] condensation product (H2L), namely, [Mn2Cl2(H2L)(HL)]Cl center dot 3H(2)O (1). The latter afforded a new compound, namely, [Mn2Cl2(H2L)(2)][MnCl4]center dot 4CH(3)CN center dot 0.5CHCl(3 center dot)0.4H(2)O (2), after recrystallisation from 1:1 CHCl3/CH3CN. The co-existence of the free and complexed azomethine groups, phenolato donors, mu-chlorido bridges, and the disiloxane unit were well evidenced by ESI mass spectrometry and FTIR spectroscopy and confirmed by X-ray crystallography. The magnetic measurements revealed an antiferromagnetic interaction between the two high-spin (S = 5/2, g = 2) manganese(II) ions through the mu-chlorido bridging ligands. The electrochemical behaviour of 1 and 2 has been studied, and details of their redox properties are reported. Both compounds act as catalysts or catalyst precursors in the solvent-free low-power microwave-assisted oxidation of selected secondary alcohols, for example, 1-phenylethanol, cyclohexanol, 2- and 3-octanol, to the corresponding ketones in the absence of solvent. The highest yield of 72% was achieved for 1-phenylethanol by using a maximum of 1% molar ratio of catalyst relative to substrate.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4950
DOI: 10.1002/ejic.201300969
ISSN: 1434-1948
1099-0682
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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