A facile route to hetero-bimetallic Ti(iv)-alkali metal calix[4]arene complexes

Antonella J. Petrella, Donald C. Craig, Robert N. Lamb, Colin L. Raston, Nicholas K. Roberts

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Pages (from-to)4590-4597
Number of pages8
JournalJournal of the Chemical Society. Dalton Transactions
Issue number24
Publication statusPublished - 2 Dec 2003
Externally publishedYes


  • Alkali metals
  • Calixarenes, crown ethers, cryptands, cyclophanes
  • Coordination chemistry
  • Molecular structure
  • Titanium


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