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Lewis-base-dictated structural variations in sodium amide chemistry: X-ray crystal structures of phenyl(2-pyridyl)amidosodium with hexamethylphosphoric triamide (HMPA) and with pentamethyldiethylenetriamine (PMDETA)

ANDREWS, P C and CLEGG, W and Mulvey, Robert (1990) Lewis-base-dictated structural variations in sodium amide chemistry: X-ray crystal structures of phenyl(2-pyridyl)amidosodium with hexamethylphosphoric triamide (HMPA) and with pentamethyldiethylenetriamine (PMDETA). Angewandte Chemie International Edition, 29 (12). pp. 1440-1441. ISSN 1433-7851

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Abstract

Two crystalline adducts of sodium amide 1 and 2 adopt contrasting binuclear structures, as revealed by X-ray diffraction. Thus, the bidentate anions are linked to the Na+ ions in a terminal manner in 1 but in a bridging manner in 2. Each structure also displays unusual donor-acceptor coordinations, with HMPA bridging to Na+ in 1, while only two of the three available PMDETA nitrogen centers complex to Na+ in 2.