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Issue 21, 2020
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Speciation of Be2+ in acidic liquid ammonia and formation of tetra- and octanuclear beryllium amido clusters

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Abstract

The hexa-μ2-amido-tetraammine-tetraberyllium compounds [Be4(NH2)6(NH3)4]X2 (X = Cl, Br, I, CN, SCN, N3) have been prepared from beryllium metal and NH4X or [Be(NH3)4]X2 in liquid ammonia at ambient temperature. The obtained compounds feature an adamantyl shaped complex cation, which was examined via X-ray diffraction, IR, Raman and NMR spectroscopy. The speciation in solution was studied via15N labeling experiments supplemented with quantum chemistry. Hereby, the intermediates [Be2(NH2)(NH3)6]3+ and [Be3(NH2)3(NH3)6]3+ were identified. Reactivity studies provided bis(N-acetimidoylacetamidinato-N,N′)-beryllium(II), when [Be4(NH2)6(NH3)4]2+ was treated with acetonitrile. While the unprecedented octa-nuclear complex cation [Be8O(NH2)12(C5H5N)4]2+ was received from pyridine. This cluster proves that the [Be4O]6+ core can be stabilized without bidentate O-donor ligands.

Graphical abstract: Speciation of Be2+ in acidic liquid ammonia and formation of tetra- and octanuclear beryllium amido clusters

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Supplementary files

Article information


Submitted
25 Feb 2020
Accepted
02 May 2020
First published
05 May 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 5415-5422
Article type
Edge Article

Speciation of Be2+ in acidic liquid ammonia and formation of tetra- and octanuclear beryllium amido clusters

M. Müller, A. J. Karttunen and M. R. Buchner, Chem. Sci., 2020, 11, 5415
DOI: 10.1039/D0SC01112F

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