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The hexa-μ 2 -amido-tetraammine-tetraberyllium compounds [Be 4 (NH 2 ) 6 (NH 3 ) 4 ]X 2 (X = Cl, Br, I, CN, SCN, N 3 ) have been prepared from beryllium metal and NH 4 X or [Be(NH 3 ) 4 ]X 2 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 via  15 N labeling experiments supplemented with quantum chemistry. Hereby, the intermediates [Be 2 (NH 2 )(NH 3 ) 6 ] 3+ and [Be 3 (NH 2 ) 3 (NH 3 ) 6 ] 3+ were identified. Reactivity studies provided bis( N -acetimidoylacetamidinato- N , N ')-beryllium(ii), when [Be 4 (NH 2 ) 6 (NH 3 ) 4 ] 2+ was treated with acetonitrile. While the unprecedented octa-nuclear complex cation [Be 8 O(NH 2 ) 12 (C 5 H 5 N) 4 ] 2+ was received from pyridine. This cluster proves that the [Be 4 O] 6+ core can be stabilized without bidentate O -donor ligands.

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

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