Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4935
Título: Dinuclear Mn (II,II) complexes: magnetic properties and microwave assisted oxidation of alcohols
Autor: Sutradhar, Manas
Martins, Luísa Margarida D. R. S.
Silva, Maria de Fátima C. Guedes da
Alegria, Elisabete Clara Bastos do Amaral
Liu, Cai-Ming
Pombeiro, Armando J. L.
Palavras-chave: Single-Molecule Magnet
Mononuclear Oxidovanadium(V) Complex
Binuclear Manganese Metalloenzyme
Electron-Paramagnetic-Resonance
Efficient Functional-Model
Oxygen-Evolving Complex
Schiff-Base Complex
Aerobic Oxidation
Catalytic-Activity
Copper(II) Complexes
Data: 2014
Editora: Royal Society of Chemistry
Citação: SUTRADHAR, Manas; [et al] – Dinuclear Mn (II,II) complexes: Magnetic properties and microwave assisted oxidation of alcohols. Dalton Transactions. ISSN: 1477-9226. Vol. 43, nr. 10 (2014), pp. 3966-3977
Resumo: A series of six new mixed-ligand dinuclear Mn(II, II) complexes of three different hydrazone Schiff bases (H3L1, H3L2 and H3L3), derived from condensation of the aromatic acid hydrazides benzohydrazide, 2-aminobenzohydrazide or 2-hydroxybenzohydrazide, with 2,3-dihydroxy benzaldehyde, respectively, is reported. Reactions of Mn(NO3)(2) center dot 4H(2)O with the H3L1-3 compounds, in the presence of pyridine (1 : 1 : 1 mole ratio), in methanol at room temperature, yield [Mn(H2L1)(py)(H2O)](2)(NO3)(2) center dot 2H(2)O (1 center dot 2H(2)O), [Mn(H2L2)(py)(CH3OH)](2)(NO3)(2) center dot 4H(2)O (2 center dot 4H(2)O) and [Mn(H2L3)(py)(H2O)](2)(NO3)(2) (3) respectively, whereas the use of excess pyridine yields complexes with two axially coordinated pyridine molecules at each Mn(II) centre, viz. [Mn(H2L1)(py)(2)] 2(NO3)(2) center dot H2O (4 center dot H2O), [Mn(H2L2)(py) H-O (6 center dot 2CH(3)OH), respectively. In all the complexes, the (H2L1-3)-ligand coordinates in the keto form. Complexes 1 center dot 2H(2)O, 2 center dot 4H(2)O, 4 center dot H2O, 5 center dot 2H(2)O and 6 center dot 2CH(3)OH are characterized by single crystal X-ray diffraction analysis. The complexes 1, 2 and 6, having different coordination environments, have been selected for variable temperature magnetic susceptibility measurements to examine the nature of magnetic interaction between magnetically coupled Mn(II) centres and also for exploration of the catalytic activity towards microwave assisted oxidation of alcohols. A yield of 81% (acetophenone) is obtained using a maximum of 0.4% molar ratio of catalyst relative to the substrate in the presence of TEMPO and in aqueous basic solution, under mild conditions.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4935
DOI: 10.1039/c3dt52774c
ISSN: 1477-9226
1477-9234
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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