Issue 22, 2000
From the journal:

Journal of the Chemical Society, Dalton Transactions

Chelating dihydroxamic acids: study of metal speciation and co-ordination compounds with Ni2+ and Cu2+

Jolanta Świątek-Kozłowska,*a   Igor O. Fritsky,*b   Agnieszka Dobosz,a   Aldona Karaczyn,c   Nikolai M. Dudarenko,b   Tatiana Yu. Sliva,b   Elżbieta Gumienna-Konteckac  and  Lucjan Jerzykiewiczc  

* Corresponding authors

a Department of Basic Medical Sciences, Wrocław Medical University, Kochanowskiego 14, Wrocław, Poland
E-mail: jsk@basmed.am.wroc.pl

b Department of Chemistry, Shevchenko University, Kiev, Ukraine
E-mail: kokozay@chem.kiev.ua

c Faculty of Chemistry, University of Wrocław, F.Joliot-Curie 14, Wrocław, Poland

Abstract

Solution (potentiometric, absorption, EPR) as well as solid state studies (X-ray, EPR, magnetic susceptibility) have shown that the binding ability of oxalodihydroxamic acid (H2oxha) with two hydroxamic groups next to each other differs distinctly from that observed for aliphatic dihydroxamic acids, HONHOC(CH2)nCONHOH (n = 3–8). H2oxha was found to be a very powerful ligand for NiII and CuII due to an N,N′-chelating binding mode. The availability of the mixed nitrogen–oxygen donor systems results in formation of polymeric complexes with CuII. The crystal structure of K2[Ni(oxha)2]·2H2O has shown two very characteristic features of the dihydroxamic ligand: (i) two short intramolecular hydrogen bonds stabilising very effectively the complex formed and (ii) very specific binding modes of K+ ions, which play a bridging role between [Ni(oxha)2]2− ions. The latter finding demonstrates a capacity of H2oxha-based anionic complex species to form polynuclear complexes with different bridging modes.

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Article information

DOI
https://doi.org/10.1039/B005500J
Article type
Paper
Submitted
10 Jul 2000
Accepted
06 Sep 2000
First published
18 Oct 2000

J. Chem. Soc., Dalton Trans., 2000, 4064-4068

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Chelating dihydroxamic acids: study of metal speciation and co-ordination compounds with Ni2+ and Cu2+

J. Świątek-Kozłowska, I. O. Fritsky, A. Dobosz, A. Karaczyn, N. M. Dudarenko, T. Yu. Sliva, E. Gumienna-Kontecka and L. Jerzykiewicz, J. Chem. Soc., Dalton Trans., 2000, 4064 DOI: 10.1039/B005500J

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