Abstract
STUDIES of the crystal structure of many organic and inorganic tri-iodides have shown that they are salts1. What happens when a tri-iodide salt forms a complex with a neutral, but polar, organic molecule? Examples, which are formed by related organic molecules, are (coumarin)4.KI3 (ref. 2) and (xanthotoxin)2.KI3 (ref. 3). (Xanthotoxin is 8-methoxy-3′,2′: 6,7-furocoumarin). The crystals of the first of these substances show one-dimensional disorder4 and its structure is not known; we have now determined the crystal structure of (xanthotoxin)2.KI3, which is fully ordered, and find that there are potassium cations, tri-iodide anions and neutral xanthotoxin molecules in the crystal. The structure is thus similar to those of other neutral molecule–salt complexes, such as (succinimide)2. tetraethylammonium bromide5. Presumably (5,5-diethylbarbituric acid)2.KI3 has a similar structure but only a very brief report has appeared6.
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KAPON, M., HERBSTEIN, F. Crystalline (xanthotoxin)2.KI3. Nature 249, 439–440 (1974). https://doi.org/10.1038/249439a0
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DOI: https://doi.org/10.1038/249439a0
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