Add time:08/06/2019         Source:sciencedirect.com

The complexes MBr4·xL (x = 6, M ≡ Th and U, L ≡ PMe2PhO (dmppo); x = 3, M ≡ Th and U, L ≡ PMePh2O (mdppo) and M ≡ Th, L ≡ P(i-C3H73O (tippo); x = 2, M ≡ Th and U, L ≡ tippo and M ≡ U, L ≡ dmppo and mdppo) and the ethyl acetate solvate UBr4·6dmppo·2MeCOOEt have been prepared. The IR and near IR-visible spectra (uranium(IV) complexes only) of these compounds are reported and their stoichiometries are discussed in terms of the steric crowding about the metal atom using a cone packing model.

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