A novel titanium–oxygen ladder structure supported by calix[4]arene ligands, characterised by synchrotron crystallography
- 1 January 1998
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 18,p. 3037-3040
- https://doi.org/10.1039/a803864c
Abstract
Reaction of an excess of TiCl4 with p-tert-butylcalix[4]arene (H4L1) in toluene led to [{Ti2(µ3-O)Cl2L1}2] 1, presumably via a fortuitous oxidation reaction. The crystal structure of the toluene disolvate, determined using synchrotron radiation single-crystal diffraction facilities, revealed a four-runged Ti4O4 planar ladder core terminated by chloro ligands on the outer titanium atoms. Each of the two calix[4]arene ligands is involved in co-ordination to three of the four titanium atoms, with one oxygen atom in a bridging mode between two metal atoms. This co-ordination enforces an unusual conformation on the ligand, with two opposite aromatic rings almost parallel and the other two splayed widely apart.Keywords
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