Issue 2, 2001

Complexes of the tripodal nitrilotrimethylenetrisphosphonic (H6L) and P,P′,P ″-triphenylnitrilotrimethylenetrisphosphinic (H3L°) acids with the copper(II) ion. Synthesis and characterization of [Hpy][Cu(H3L)(H2O)] and [Cu(HL°)(py)]2·2Me2CO

Abstract

The complexes [Hpy][Cu(H3L)(H2O)] 1 (L6− = nitrilotrimethylenetrisphosphonate) and [Cu(HL°)(py)]2·2Me2CO 2 [(L°)3− = P,P′,P ″-triphenylnitrilotrismethylenetrisphosphinate)] have been isolated and characterized by X-ray crystallography, near IR-visible spectroscopy and magnetic measurements. The structure determination has shown the complexes to be constituted by monomeric and dimeric units respectively. In the monomer the metal atom is surrounded by the phosphonate ligand and a water molecule, with a geometry between a trigonal bipyramid and a square pyramid. The two copper atoms in the dimer are held together by an arm of the tripod ligand, with a pyridine molecule as additional ligand, and display octahedral geometry. The presence of monomeric and dimeric species in aqueous solutions of 1 and 2 has been shown by ESMS studies. The formation in water solution of the dimer [{Cu(H3L)}2]2−, as a minor species, has been supported by potentiometric measurements, whereas only the monomeric anion [CuL°] has been ascertained to be present. In general the ligand H3L° forms less stable copper(II) complexes than H6L.

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Supplementary files

Article information

Article type
Paper
Submitted
08 Jun 2000
Accepted
20 Nov 2000
First published
20 Dec 2000

J. Chem. Soc., Dalton Trans., 2001, 211-217

Complexes of the tripodal nitrilotrimethylenetrisphosphonic (H6L) and P,P′,P ″-triphenylnitrilotrimethylenetrisphosphinic (H3L°) acids with the copper(II) ion. Synthesis and characterization of [Hpy][Cu(H3L)(H2O)] and [Cu(HL°)(py)]2·2Me2CO

F. Cecconi, C. A. Ghilardi, P. A. Lorenzo Luis, S. Midollini, A. Orlandini, D. Dakternieks, A. Duthie, S. Dominguez, E. Berti and A. Vacca, J. Chem. Soc., Dalton Trans., 2001, 211 DOI: 10.1039/B004576O

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