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Issue 19, 2008
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Structural diversity in bishydroxylamine complexes of gallium

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Reactions of bishydroxylamines of the type HON(R)CH2CH2N(R)OH (R = Me, tBu) with trimethyl- and triisopropylgallium gave bicyclic metalla cages of the formula R′2GaO(R)NCH2CH2N(R)OGaR′2 [R′ = Me, R = Me (3a), tBu (3b); R′ = iPr, R = Me (4a), tBu (4b)] with six-membered Ga2O2N2-rings. While the complexes show the same core constitution in the solid state, NMR spectra reveal the steric influence of the isopropyl substituent of the compounds 4a/4b on its behaviour in solution. The reaction of the sterically more demanding substituted tri-tert-butylgallium with HON(Me)CH2CH2N(Me)OH yielded a heterodimeric complex O′-[HON(Me)CH2CH2NH(Me)O(tBu2Ga)]-cyclo-(tBu2Ga)-O,N′-[ON(Me)CH2CH2N(Me)O] (5) with two gallium atoms of different surrounding and two different bishydroxylamine ligands, one doubly deprotonated and one protonated, but at one end in its tautomeric aminoxide form. Further condensation of 5 was observed to give a tricyclic compound cyclo-[(tBuGa)ON(Me)CH2CH2N(Me)O]2 (6) with a central Ga2O2N2 ring resulting from two Ga–N donor–acceptor bonds.

Graphical abstract: Structural diversity in bishydroxylamine complexes of gallium

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The article was received on 26 Nov 2007, accepted on 22 Feb 2008 and first published on 25 Mar 2008

Article type: Paper
DOI: 10.1039/B718268F
Citation: Dalton Trans., 2008,0, 2549-2556

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    Structural diversity in bishydroxylamine complexes of gallium

    P. Bösing, A. Willner, T. Pape, A. Hepp and N. W. Mitzel, Dalton Trans., 2008, 0, 2549
    DOI: 10.1039/B718268F

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