Copper(II) and zinc(II) complexes of N,N-bis(benzimidazole-2-ylmethyl)-amine. Synthesis, formation constants and the crystal structure of [ZnLCl]2]. MeOH. Catalytic activity of the complexes in the hydrolysis of the phosphotriester 2,4-dinitrophenyl diethyl phosphate

Robert W. Hay*, Thomas Clifford, Philip Lightfoot

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The copper(II) and zinc(II) complexes of N,N-bis(benzimidazole-2-ylmethyl)amine (L) have been prepared and the crystal structure of [ZnLCl2]. MeOH determined. The complex is five-coordinate with a distorted square pyramidal geometry on zinc. Two pyridine nitrogen donors from the imidazole groups, the secondary amino group and one chloride act as in-plane donors with the axial site occupied by chloride. The zinc(II) lies some 0.65 Å above the basal plane. The stepwise protonation constants of the ligand have been obtained, log K11=5.638(3) and log K12=10.12(1) and the stability constants (log β1mh) for the copper(II) and zinc(II) complexes determined using 50% MeOH-H2O as solvent. The hydroxoaqua complexes [ML(OH) (OH2)]+ show only slight catalytic activity in the hydrolysis of the phosphotriester 2,4-dinitrophenyl diethyl phosphate.

Original languageEnglish
Pages (from-to)3575-3581
Number of pages7
JournalPolyhedron
Volume17
Issue number20
DOIs
Publication statusPublished - 30 Sept 1998

Keywords

  • Benzimidazole ligand
  • Catalytic activity
  • Copper(II)
  • Crystal structure
  • Phosphotriester
  • Zinc(II)

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