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Issue 8, 2017
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One-pot synthesis of ultrastable pentanuclear alkylzinc complexes

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Abstract

Two organometallic pentanuclear zinc complexes, namely [Zn5Et4(Me2bta)6] and [Zn5Me4(Me2bta)6], containing tridentate N-donor ligands (5,6-dimethylbenzotriazolate, Me2bta) were prepared by a one-pot synthesis. These compounds represent the first examples of organometallic complexes featuring a Kuratowski-type bond topology. Zinc ions were introduced as organometallic precursors (either diethylzinc or dimethylzinc was used), which upon mixing with the ligand yielded the desired complexes spontaneously. The organometallic complexes were characterized by a range of analytical techniques including NMR- and FT-IR spectroscopy, mass spectrometry, and elemental analysis. In addition, the structure of [Zn5Et4(Me2bta)6] could be solved by single-crystal X-ray analysis. The thermal and chemical stability of the complexes was studied by TGA, VT-XRPD and DRIFT, in addition to NMR and mass spectrometric investigations. The compounds were found to be unexpectedly stable under various conditions and to lack any reactivity with electrophilic reactants such as aldehydes, which commonly react easily with organozinc compounds. However, the basic alkyl groups could be reacted with strongly acidic compounds such as trifluoroacetic acid.

Graphical abstract: One-pot synthesis of ultrastable pentanuclear alkylzinc complexes

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Publication details

The article was received on 19 Dec 2016, accepted on 28 Jan 2017 and first published on 30 Jan 2017


Article type: Paper
DOI: 10.1039/C6DT04778E
Citation: Dalton Trans., 2017,46, 2618-2625
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    One-pot synthesis of ultrastable pentanuclear alkylzinc complexes

    H. Bunzen, M. Grzywa, A. Kalytta-Mewes and D. Volkmer, Dalton Trans., 2017, 46, 2618
    DOI: 10.1039/C6DT04778E

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