Original scientific paper

https://doi.org/10.5562/cca1747

Octahedral and Tetrahedral Cobalt(II) Sites in Cobalt Chloride Complexes with Polyethers

Saša Petriček ; University of Ljubljana, Faculty of Chemistry and Chemical Technology, Aškarčeva c. 5, SI-1000 Ljubljana, Slovenia

Abstract

A reaction of cobalt chloride hexahydrate with dimethoxyethane (dme) resulted in a dinuclear
complex [CoCl₂(dme)]₂ (1). The complex 1 reacted with di(2-methoxyethyl) ether (diglyme) in tetrahydrofuran
(thf) solvent achieving polymeric [Co₂Cl₄(diglyme)]_n (2). A reaction of cobalt chloride hexahydrate,
diglyme and (CH₃)₃SiCl in thf yielded the crystals of [Co₂Cl₄(diglyme)(thf)] (3). Both, tetrahedral
and octahedral environments of cobalt ions were found in each of the complexes, 1, 2 and 3. Cobalt ions
display a distorted octahedral geometry with bridging chlorides and terminal oxygen atoms from ether
ligands and a distorted tetrahedral geometry with non-bridging and bridging chlorides. A four- and a sixcoordinate
cobalt ion are linked by a double chloride bridge in the dinuclear complexes 1 and 3. Two
tetrahedral or two octahedral cobalt ions in 2 are connected by double chloride bridges in dinuclear units
which are linked to infinite chains by single chloride bridges. (doi: 10.5562/cca1747)

Keywords

dinuclear; polymeric cobalt chloride complexes; dimethoxyethane; di(2-methoxyethyl); crystal structure; bridging chlorides

Hrčak ID:

75062

URI

https://hrcak.srce.hr/75062

Publication date:

20.12.2011.

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