Abstract
IT has been pointed out by Clark1 that there is a great similarity between the structures of the four alkali polyhalides KI3, CsI3, CsIBr2, and CsICl2. They have the same arrangement of atoms in unit parallelepipeda, if the unit cells are chosen so as to contain one molecule. The arrangement is with the metal atoms at the corners of the cell and the halogen atoms inside the cell and in a line on the body diagonal. The same arrangement is taken up by the complex radicles in the hexammoniates of the nickel halides and the hexahydrate of zinc bromate. This body-centred grouping is a deformation of the arrangement in CsCl.2
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References
A. L. Clark, Pro. Nat. Acad. Sci., 9, 4, 1923, p. 112.
R. A. Dickinson, J.A.C.S., 44, 1922, p. 1489.
A. Karssen . Dissertation, Amsterdam, 1923; W. Kiby, Zeit. f. Physik, 17, 1923, p. 213.
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Bartlett and Langmuir, J.A.C.S., 43, 1921, p. 84.
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SMITH, J. Molecular Symmetry in Crystal Structure. Nature 115, 334–335 (1925). https://doi.org/10.1038/115334b0
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DOI: https://doi.org/10.1038/115334b0
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