Abstract
Deprotonation of calix[4]arenes by alkali metal in methanol using simple benchtop procedures is effective in the formation of novel monomeric and dimeric titanium(iv) complexes. For the larger alkali metal cations, K+ and Cs+, favourable complexation within the π-basic calix[4]arene cavity facilitates the formation of monomeric titanium(iv) complexes when oligomer formation is inhibited by an acetylacetonate ligand. In contrast, the smaller Li+ and Na+ ions preferentially form dimeric complexes with exo-bridging alkali and titanium(iv) metal centres. A dimeric complex is also obtained for potassium in the absence of acetylacetonate. The solid state structures of the K–Ti and Na–Ti calix[4]arene dimer complexes show different structural characteristics depending on the nature of the alkali metal.
Original language | English |
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Pages (from-to) | 4590-4597 |
Number of pages | 8 |
Journal | Journal of the Chemical Society. Dalton Transactions |
Volume | 3 |
Issue number | 24 |
DOIs | |
Publication status | Published - 2 Dec 2003 |
Externally published | Yes |
Keywords
- Alkali metals
- Calixarenes, crown ethers, cryptands, cyclophanes
- Coordination chemistry
- Molecular structure
- Titanium