Structure of lanthanum(III) tris-dipivaloylmethanate

详细

A series of Ln(III) dipivaloylmethanates of the composition Ln(dpm)₃ (Ln = La, Tm, Yb) is obtained. It is established that Tm(dpm)₃ and Yb(dpm)₃ complexes are isostructural with Lu(dpm)₃. The crystal structure of [La(dpm)₃]₂ at 150(2) K is determined (space group P2₁/n, a = 12.4412(5) Å, b = 28.0579(12) Å, с = 21.9533(8) Å, β = 105.796(2)°, V = 7373.9(5) ų, Z = 4). The studied compound is isostructural with [Pr(dpm)₃]₂, [Eu(dpm)₃]₂, [Gd(dpm)₃]₂, and [Tb(dpm)₃]₂ complexes. The crystal structure of the complex is formed by dimeric [La(dpm)₃]₂ molecules. Thermogravimetric investigations show that the volatility of Ln(dpm)₃ increases in the series from [La(dpm)₃]₂ to Yb(dpm)₃. Melting points of the complexes are close to the known literature data.