Immobilisation of eta(3)-allyidicarbonyl complexes of Mo-II with bidentate nitrogen ligands within aluminium-pillared clays
authors 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
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords molybdenum complexes; N ligands; clays; epoxidation
keywords TERT-BUTYL HYDROPEROXIDE; DIOXOMOLYBDENUM(VI) COMPLEXES; EPOXIDATION CATALYSTS; MOLYBDENUM COMPLEXES; DERIVATIVES; ENCAPSULATION; DICARBONYL; ADSORPTION; PRECURSORS; KINETICS
abstract 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).
publisher WILEY-V C H VERLAG GMBH
issn 1434-1948
year published 2008
issue 7
beginning page 1147
ending page 1156
digital object identifier (doi) 10.1002/ejic.200700939
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000254582200021
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journal impact factor 2.529
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