Einsteinium triiodide is an iodide of the synthetic actinide einsteinium which has the molecular formula EsI3. This crystalline salt is an amber-coloured solid.Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102nd Edition, de Gruyter, Berlin 2007, , p. 1969. It glows red in the dark due to einsteinium's intense radioactivity.
It crystallises in the hexagonal crystal system in the space group R with the lattice parameters a = 753 pm and c = 2084.5 pm with six formula units per unit cell. Its crystal structure is isotypic with that of bismuth(III) iodide.R. G. Haire, ORNL Report 5485, 1978.J. R. Peterson: "Chemical Properties of Einsteinium: Part II", in: G. T. Seaborg (ed.): Proceedings of the 'Symposium Commemorating the 25th Anniversary of Elements 99 and 100', 23. January 1978; Report LBL-7701, April 1979, pp. 55–64.
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