TITLE

Zinc halide oxazoline complexes – The quest for structural diversity

AUTHOR(S)
Gossage, Robert A.; Yadav, Paras N.; MacInnis, Timothy D.; Quail, J. Wilson; Decken, Andreas
PUB. DATE
January 2009
SOURCE
Canadian Journal of Chemistry;Jan2009, Vol. 87 Issue 1, p368
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The synthesis and characterization of 14 ZnX2 (X = Cl or Br) complexes containing aryl-oxazoline (ox) ligands is reported. Eleven of these derivatives have been structurally elucidated in the solid state by single crystal X-ray diffraction methods. The ligands used are 2-(3-R-phenyl)-2-oxazoline (R = Cl or Me), 2-(4-R-phenyl)-2-oxazoline (R = Cl, F, Me or –OMe), and 2-(anisol-2-yl)-4,4-dimethyl-2-oxazoline (7a). All oxazolines, with the exception of 7a, lead to the formation of materials identified as ZnX2(ox)2 upon reaction with ZnX2. A distorted tetrahedral coordination motif around the Zn metal centre is displayed in nine examples that have been characterized by single crystal X-ray diffraction methods. In the case of ligand 7a, an unusual dimeric species (X-ray) of formula [ZnCl2(7a)]2 (7b) is formed upon reaction with ZnCl2. Compound 7b displays a rare (formally neutral) µ-(Cl)2-(Zn[L]Cl)2 (L = neutral donor ligand) unit in addition to secondary bonding interactions between the Zn centres and the O-atom of the –OMe group (Zn···O distance of ~2.56 Å). In contrast, reactions of 7a with ZnBr2 lead to the formation of a monomeric species containing a chelating molecule of 7a with binding through the oxazoline N-atom and the methoxy (Zn–O distance of ~2.14 Å) group, i.e., ZnBr2(7a-κ2N,OOMe). These complexes are discussed in terms of structurally related Zn species and some comment is made as to the direction to be explored within this series of materials that may lead to further unusual structural diversity.
ACCESSION #
36956005

 

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