The Reaction of mer-­[ScCl₃(H₂O)₃] with Pyridine : Crystal Structure of [Sc₂Cl₄(μ­-OH)₂(Py)₄]·4Py

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Massa, Werner ; Agarwal, Seema ; Grabe, Norman ; Dehnicke, Kurt:
The Reaction of mer-­[ScCl₃(H₂O)₃] with Pyridine : Crystal Structure of [Sc₂Cl₄(μ­-OH)₂(Py)₄]·4Py.
In: Zeitschrift für anorganische und allgemeine Chemie. Bd. 635 (2009) Heft 12 . - S. 1910-1914.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.200900332

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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.