Speciation of [Cp*2M2O5] in Polar and Donor Solvents
Résumé
The speciation of compounds [Cp*2M2O5] (M=Mo, W; Cp*=pentamethylcyclopentadienyl) in different protic and aprotic polar solvents (methanol, dimethyl sulfoxide, acetone, acetonitrile), in the presence of variable amounts of water or acid/base, has been investigated by 1H NMR spectrometry and electrical conductivity. Specific hypotheses suggested by the experimental results have been further probed by DFT calculations. The solvent (S)-assisted ionic dissociation to generate [Cp*MO2(S)]+ and [Cp*MO3]− takes place extensively for both metals only in water/methanol mixtures. Equilibrium amounts of the neutral hydroxido species [Cp*MO2(OH)] are generated in the presence of water, with the relative amount increasing in the order MeCN≈acetone
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https://hal.science/hal-02908715
Soumis le : jeudi 29 juillet 2021-15:23:37
Dernière modification le : mercredi 24 avril 2024-13:30:03
Archivage à long terme le : samedi 30 octobre 2021-18:28:36
Citer
Pelin Sözen-Aktaş, Iker Del rosal, Eric Manoury, Funda Demirhan, Agustí Lledós, et al.. Speciation of [Cp*2M2O5] in Polar and Donor Solvents. Chemistry - A European Journal, 2013, 19 (12), pp.3969-3985. ⟨10.1002/chem.201203075⟩. ⟨hal-02908715⟩
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