Structural Study of Polymorphism in [La(Gly) 3 ·2H 2 O](ClO 4 ) 3

The crystal structures of [La(Gly)3·2H2O](ClO4)3 were determined by X-ray diffraction analysis at temperatures 100 K and 300 K: space group P $$\overline{1}$$ , a = 10.58650(10), b = 12.9131(2), c = 16.4845(2) A, α = 86.3970(10), β = 76.6550(10), γ = 72.4450(10)°, Z = 4; R = 0.0367 (T = 100 K); space group P $$\overline{1}$$ , a = 8.77980(10), b = 10.75560(10), c = 13.0038(2) A, α = 71.5090(10), β = 82.8020(10), γ = 67.2400(10)°, Z = 2; R = 0.0245 (T = 300 K). The study revealed features of structural changes in the phase transition. The method of differential scanning calorimetry determined the temperature of the phase transition (Ttr = 283 K). The method of molecular Voronoi−Dirichlet polyhedra was used for the analysis of polymorphism in [La(Gly)3·2H2O](ClO4)3. The crystal structures of [La(Gly)3·2H2O](ClO4)3 were determined by X-ray diffraction analysis (T= 100K and 300K) and the study revealed features of structural changes in the phase transition. Structural changes at the phase transition in [La(Gly)3·2H2O](ClO4)3.