Format

Send to:

Choose Destination
See comment in PubMed Commons below
J Inorg Biochem. 2003 Jan 15;93(3-4):174-80.

Pentacopper(II) 12-metallacrown-4 complexes with alpha- and beta-aminohydroxamic acids in aqueous solution: a reinvestigation.

Author information

  • 1Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Universit√† di Parma, Parco Area delle Scienze 17A, I-43100 Parma, Italy.

Abstract

A reinvestigation of the equilibria of (S)-alpha-alaninehydroxamic acid (alpha-Alaha) and (R)-aspartic-beta-hydroxamic acid (Asp-beta-ha) with copper(II) was performed in aqueous solution in order to clarify some contradictory literature reports regarding the stoichiometry of the polynuclear complexes formed. beta-Alaninehydroxamic acid (beta-Alaha, HL), for which the formation of a planar 12-metallacrown-4, [Cu(5)L(4)H(-4)](2+), was already reported, was also re-examined for comparison. Among the different techniques used (potentiometry, absorption spectrophotometry, spectropolarimetry and electrospray ionization mass spectrometry), ES data allowed to define unambiguously that all these three ligands form the same pentanuclear species. Therefore it can be concluded that in aqueous solution the hydroxamates of both alpha- and beta-amino acids form 12-metallacrown-4 complexes, and that the formers are less stable.

PMID:
12576279
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk