Electronic and steric factors affecting the formation of four or five-coordinated aluminum complexes: Syntheses and crystal structures of some aluminum alkoxides

Chia Her Lin*, Bao Tsan Ko, Fa Cherng Wang, Chu Chieh Lin, Chen Yuan Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

The reaction of 2-phenoxyethanol with AlX3 affords a five-coordinated dimeric product [(μ-OCH2CH2OPh)AlX2]2 (1, X=Cl; 2, X=Br) in high yields. However, the reaction of 2-phenoxyethanol with Al(Bui)3 yields a four-coordinated dimeric product [(μ-O(CH2)2OPh)Al(Bui)2] 2 (3). A mixture, [(μ-O(CH2)2OPh)Al(Et)0.75(Cl) 1.25]2 (4) is obtained from the reaction of 2-phenoxyethanol with one equivalent of Et2AlCl. The reaction of 2-methoxybenzyl alcohol with AlR3 gives a semi-pentacoordinated dimeric product [(μ-OCH2C6H4OMe)AlR2]2 (5, R=Me; 6, X=Bui) in high yields. Crystal structure studies of these compounds reveal that the distance between Al and the phenoxy oxygen or the methoxy oxygen is 3>6>5≫4>1~2. Although both the electronic and steric effect influence the nature of the O,O′-bifunctional ligand chelating on the aluminum center to generate a five- or four-coordinated aluminum, the electronic effect is considered to play a major role. The interaction of aluminum and ethereal oxygen can be monitored by 13C-NMR spectroscopic studies.

Original languageEnglish
Pages (from-to)67-75
Number of pages9
JournalJournal of Organometallic Chemistry
Volume575
Issue number1
DOIs
Publication statusPublished - 1999 Feb 22
Externally publishedYes

Keywords

  • 2-Methoxybenzyl alcohol
  • 2-Phenoxyethanol
  • Aluminum
  • Bifunctional
  • Ether alcohol

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Electronic and steric factors affecting the formation of four or five-coordinated aluminum complexes: Syntheses and crystal structures of some aluminum alkoxides'. Together they form a unique fingerprint.

Cite this