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Complexes of the tripodal nitrilotrimethylenetrisphosphonic (H6L) and P,P',P''-triphenylnitrilotrimethylenetrisphosphinic (H3L) acids with the copper(II) ion. Synthesis and charaterization of [Hpy][Cu(H3L)(H2O)] and [Cu(HL)(py)]2.2Me2CO

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journal contribution
posted on 2001-01-01, 00:00 authored by F Cecconi, C Ghilardi, P Luis, S Midollini, A Orlandini, Dainis Dakternieks, Andrew DuthieAndrew Duthie, S Dominguez, E Berti, A Vacca
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.


History

Journal

Dalton transactions

Volume

2001

Pagination

211 - 217

Publisher

RSC Publishing

Location

Cambridge, England

ISSN

1477-9226

eISSN

1477-9234

Language

eng

Notes

Published on the Web 20th December 2000

Publication classification

C1 Refereed article in a scholarly journal; C Journal article

Copyright notice

2001, The Royal Society of Chemistry