The crystal structures of three alkali-metal complexes with cyclic polyethers

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Abstract
The crystal structures are reported of sodium bromide with a 6-oxygen cyclic ether, sodium iodide with a 5-oxygen cyclic ether, and potassium iodide with a 10-oxygen ether; in the first two the cation is co-ordinated by additional entities but the 10-oxygen compound encloses the potassium completely.