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The Reaction of mer ‐[ScCl 3 (H 2 O) 3 ] with Pyridine. Crystal Structure of [Sc 2 Cl 4 (μ‐OH) 2 (Py) 4 ]·4Py
Author(s) -
Massa Werner,
Agarwal Seema,
Grabe Norman,
Dehnicke Kurt
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200900332
Subject(s) - pyridine , scandium , chemistry , crystallography , thionyl chloride , crystal structure , molecule , catalysis , chloride , inorganic chemistry , medicinal chemistry , organic chemistry
mer ‐[ScCl 3 (H 2 O) 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 [Sc 2 Cl 4 (μ‐OH) 2 (py) 4 ]·4py ( 2 ·4py), which is characterized by X‐ray diffraction: Space group I 2/ 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)°, R 1 = 0.0584. The molecular structure of 2 consists of distorted octahedrally coordinated scandium atoms, which are connected by μ‐OH groups to form planar Sc 2 O 2 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.