resumo
Molybdenum(II) complexes [MOX(CO)(2)(eta(3)-allyl)(CH3CN)(2)] (X = Cl or Br) were encapsulated in an aluminium-pillared natural clay or a porous clay heterostructure and allowed to react with bidentate diimine ligands. All the materials obtained were characterised by several solid-state techniques. Powder XRD, and Al-27 and Si-29 MAS NMR were used to investigate the integrity of the pillared clay during the modification treatments. C-13 CP MAS NMR, FTIR, elemental analyses and low-temperature nitrogen adsorption showed that the immobilisation of the precursor complexes was successful as well as the in situ ligand-substitution reaction. The new complex [MoBr(CO)(2)(eta(3)-allyl)(2-aminodipyridyl)] was characterised by single-crystal X-ray diffraction and spectroscopic techniques, and NMR studies were used to investigate its fluxional behaviour in solution. The prepared materials are active for the oxidation of cis-cyclooctene using tert-butyl hydroperoxide as oxidant, though the activity of the isolated complexes is higher. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).
palavras-chave
TERT-BUTYL HYDROPEROXIDE; DIOXOMOLYBDENUM(VI) COMPLEXES; EPOXIDATION CATALYSTS; MOLYBDENUM COMPLEXES; DERIVATIVES; ENCAPSULATION; DICARBONYL; ADSORPTION; PRECURSORS; KINETICS
categoria
Chemistry
autores
Alonso, JC; Neves, P; Silva, C; Valente, AA; Brandao, P; Quintal, S; de Brito, MJV; Pinto, P; Felix, V; Drew, MGB; Pires, J; Carvalho, AP; Calhorda, MJ; Ferreira, P
nossos autores
Anabela Tavares Aguiar Valente
Investigador Principal
Patrícia dos Santos Neves
Investigador Auxiliar
Paula Celeste da Silva Ferreira
Investigador Coordenador
Paula Cristina Ferreira da Silva Brandão
Investigador Auxiliar