Die Reaktion von mer-[ScCl₃(H₂O)₃] mit Pyridin. Kristallstruktur von [Sc₂Cl₄(μ-OH)₂(Py)₄·4Py

Kurt Dehnicke , Werner Massa (1) , Seema Agarwal (1) , Norman Grabe (1)

1 Chemistry

Abstract. mer-[ScCl3(H2O)3] (1) was prepared from aqueous solutions of scandium trichloride by evaporation and subsequent treatment with thionyl chloride at room temperature. The IR spectrum of 1 is in accordance with the meridional arrangement of the chlorido and aqua ligands. Its reaction with excess pyridine yields [Sc2Cl4(µ-OH)2(py)4]·4py (2·4py), which is characterized by X-ray diffraction: Space group I2/a, Z = 8, lattice dimensions at 193(2) K: a = 2051.3(2), b = 1056.3(7), c = 4389.4(5) pm, β = 102.967(12)°, R1 = 0.0584. The molecular structure of 2 consists of distorted octahedrally coordinated scandium atoms which are connected by µ-OH groups to form planar Sc2O2 four-membered rings. The coordination of the scandium atoms is completed by two chlorine ligands and by the nitrogen atoms of the pyridine molecules, the latter being in trans-positions to one another. Experiments to use 2 as possible catalyst for ring-opening polymerization of ε-caprolactone (ROP) without co-catalysts were not successful.

Mots clés: Physical Sciences

Kurt Dehnicke, Werner Massa, Seema Agarwal, Norman Grabe. Die Reaktion von mer-[ScCl₃(H₂O)₃] mit Pyridin. Kristallstruktur von [Sc₂Cl₄(μ-OH)₂(Py)₄·4Py. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2009, 635 (12), pp.1910. ⟨10.1002/zaac.200900332⟩. ⟨hal-00515814⟩