Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4958
Título: Synthesis and characterization of COPPER(II) 4´-phenyl-terpyridine compounds and catalytic application for aerobic oxidation of benzylic alcohols
Autor: Ma, Zhen
Wei, Lijuan
Alegria, Elisabete C. B. A.
Martins, Luísa Margarida D. R. S.
Silva, Maria de Fátima C. Guedes da
Pombeiro, Armando J. L.
Palavras-chave: Solid-state photoluminescence
Mild conditions
Silver(I)-2,2'/6',2''-terpyridine complexes
Electrochemical parametrization
Corresponding aldehydes
Data: 2014
Editora: Royal Society of Chemistry
Citação: MA, Zhen; [et al] – Synthesis and characterization of COPPER(II) 4´-Phenyl-Terpyridine compounds and catalytic application for aerobic oxidation of Benzylic Alcohols. Dalton Transactions. ISSN: 1477-9226. Vol. 43, nr. 10 (2014), pp. 4048-4058
Resumo: The reactions between 4'-phenyl-terpyridine (L) and nitrate, acetate or chloride Cu(II) salts led to the formation of [Cu(NO3)(2)L] (1), [Cu(OCOCH3)(2)L]center dot CH2Cl2 (2 center dot CH2Cl2)and [CuCl2L]center dot[Cu(Cl)(mu-Cl)L](2) (3), respectively. Upon dissolving 1 in mixtures of DMSO-MeOH or EtOH-DMF the compounds [Cu(H2O){OS(CH3)(2)}L]-(NO3)(2) (4) and [Cu(HO)(CH3CH2OH)L](NO3) (5) were obtained, in this order. Reaction of 3 with AgSO3CF3 led to [CuCl(OSO2CF3)L] (6). The compounds were characterized by ESI-MS, IR, elemental analysis, electrochemical techniques and, for 2-6, also by single crystal X-ray diffraction. They undergo, by cyclic voltammetry, two single-electron irreversible reductions assigned to Cu(II) -> Cu(I)and Cu(I) -> Cu(0) and, for those of the same structural type, the reduction potential appears to correlate with the summation of the values of the Lever electrochemical EL ligand parameter, which is reported for the first time for copper complexes. Complexes 1-6 in combination with TEMPO (2,2,6,6-tetramethylpiperidinyl-1-oxyl radical) can exhibit a high catalytic activity, under mild conditions and in alkaline aqueous solution, for the aerobic oxidation of benzylic alcohols. Molar yields up to 94% (based on the alcohol) with TON values up to 320 were achieved after 22 h.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4958
DOI: 10.1039/c3dt53054j
ISSN: 1477-9226
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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