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Issue 4, 2004
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The influence of the boat-to-chair conversion on the demetallation of the nickel(II) complex of an open-chain tetramine containing a piperazine fragment

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Abstract

The nickel(II) complex with an open chain tetramine containing a piperazine fragment (1) displays an unusual resistance to demetallation in acidic solution and exhibits a lifetime of about five minutes in a solution 0.1 M in HClO4 and 7.0 M in NaClO4. Sluggishness with respect to the demetallation is ascribed to the occurrence of the boat-to-chair conformational conversion of the piperazine fragment, which implies the passage through the highly energetic half-boat transition state. The use of a high concentration of the inert electrolyte induces a ‘salting out’ effect on both thermodynamics (stability of metal complexes is enhanced) and kinetics (resistance to demetallation is increased).

Graphical abstract: The influence of the boat-to-chair conversion on the demetallation of the nickel(ii) complex of an open-chain tetramine containing a piperazine fragment

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Publication details

The article was received on 16 Oct 2003, accepted on 10 Dec 2003 and first published on 21 Jan 2004


Article type: Paper
DOI: 10.1039/B312980B
Citation: Dalton Trans., 2004,0, 653-658
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    The influence of the boat-to-chair conversion on the demetallation of the nickel(II) complex of an open-chain tetramine containing a piperazine fragment

    M. Boiocchi, M. Bonizzoni, L. Fabbrizzi, F. Foti, M. Licchelli, A. Taglietti and M. Zema, Dalton Trans., 2004, 0, 653
    DOI: 10.1039/B312980B

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