Issue 17, 2005
From the journal:

Dalton Transactions

Cyclam (1,4,8,11-tetraazacyclotetradecane) with one methylphosphonate pendant arm: a new ligand for selective copper(ii) binding†

Silvia Füzerová,a   Jan Kotek,a   Ivana Císařová,a   Petr Hermann,*a   Koen Binnemansb  and  Ivan Lukeša  

* Corresponding authors

a Department of Inorganic Chemistry, Universita Karlova (Charles University), Hlavova 2030, Prague 2, Czech Republic
E-mail: petrh@natur.cuni.cz
Fax: +420-22195-1253
Tel: +420-22195-1263

b Laboratory of Coordination Chemistry, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven, Belgium

Abstract

The new ligand, [(1,4,8,11-tetraazacyclotetradecan-1-yl)methyl]phosphonic acid (H2te1P, H2L), was synthesized and its complexing properties towards selected metal ions were studied potentiometrically. The ligand forms a very stable complex with copper(II) (logβ(CuL) = 27.34), with a high selectivity over binding of other metal ions (i.e. logβ(ZnL) = 21.03). The crystal structures of the free ligand (in its protonated form with bromide as counter-ion) and two copper(II) complexes (obtained by crystallization at various pH) were determined. The free ligand adopts the common conformation for such macrocycles with the protonated nitrogen atoms in the corners of a virtual rectangle. In the trans-Br,O-[Cu(Br)(Hte1P)]·H2O species, the central metal ion is surrounded by four in plane nitrogen atoms, one oxygen atom of the pendant moiety in the apical position and a bromide anion positioned trans to the oxygen atom, forming a distorted octahedral coordination sphere. In the compound [Cu(H2te1P)][Cu(Hte1P)]Br3·6H2O, obtained from a highly acidic solution, the bromide anions are placed further away from the copper(II) ion and the coordination environment (N4O) is thus square-pyramidal. In both structures, the protons are associated with non-coordinated phosphonate oxygen atoms.

Graphical abstract: Cyclam (1,4,8,11-tetraazacyclotetradecane) with one methylphosphonate pendant arm: a new ligand for selective copper(ii) binding

About
Cited by
Related
Download options Please wait...

Supplementary files

Article information

DOI
https://doi.org/10.1039/B507062G
Article type
Paper
Submitted
18 May 2005
Accepted
01 Jul 2005
First published
26 Jul 2005

Dalton Trans., 2005, 2908-2915

Permissions

Request permissions

Cyclam (1,4,8,11-tetraazacyclotetradecane) with one methylphosphonate pendant arm: a new ligand for selective copper(II) binding

S. Füzerová, J. Kotek, I. Císařová, P. Hermann, K. Binnemans and I. Lukeš, Dalton Trans., 2005, 2908 DOI: 10.1039/B507062G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements