Abstract
By reaction of the anhydrous metal (III) halide with a secondary amine and carbon dioxide in a hydrocarbon solvent, the first NN-dialkylcarbamato-complexes of lanthanide metals have been prepared, [Mn(O2CNR2)3n,](M = Yb or Er). In the case of the ytterbium derivative with R= Pri, the crystal and molecular structure has been solved by X-ray diffraction methods. The complex is a tetramer, [{Yb(O2CNPri2)3}4]·2C7H16; crystals are monoclinic, space group C2/c, with a= 29.069(5), b= 19.591 (3), c= 23.193(4)A, β= 107.70(2)°, and Z= 4. The four seven-co-ordinate ytterbium atoms are joined by bridging NN-dialkylcarbamato-groups. The ytterbium derivative reacts promptly with proton-active substances yielding the appropriate complex salts, with quantitative evolution of carbon dioxide.
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