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New developments in the Lewis acid chemistry of phosphorus(III).

Date

2004

Authors

Ragogna, Paul J.

Journal Title

Journal ISSN

Volume Title

Publisher

Dalhousie University

Abstract

Description

Phosphines are traditional Lewis bases or ligands in complexes of transition metals and main group Lewis acceptors. In spite of their electron-rich (lone pair bearing) nature, an extensive coordination chemistry of Lewis acidic phosphorus centres is developing, highlighting a new synthetic approach leading to new structure and bonding. The P-P bond in phosphine-phosphenium cations is best described as a donor-acceptor interaction, that is, a phosphine ligand on a phosphenium acceptor. This bonding description can be exploited as the phosphine-phosphenium cations allow for ligand exchange reactions at the phosphenium centre, generating new P-Element bonds. Extended di-cationic arrays can be achieved by the versatile method of ligand displacement.
The realisation of Lewis acidic phosphines has further prompted an investigation into the formation of chelate rings using the 2-amino-4-amino-2-pentene ligand commonly known as Dipp2nacnac. The synthesis and characterisation of a new Dipp2nacnac derivative containing a diphenylphosphino substituent on the backbone has been achieved and this feature is a useful 31P NMR spectroscopic probe to study the novel coordination chemistry of the new ligand.
Thesis (Ph.D.)--Dalhousie University (Canada), 2004.

Keywords

Chemistry, Biochemistry.

Citation