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Bibliographic and numerical data on 1540 organo-lanthanide and 895 organo-actinide crystalline compounds were derived from the Cambridge Structural Database. After removal of the double entries, the compounds were classified into the 230 crystallographic space groups according to their space-group numbers, and the relative frequency of occurrence of each square group was then determined. 10.0 % of the lanthanide and 8.4 % of the actinide compounds fall in space groups of tetragonal or higher symmetry. In both cases, only 71 of the space groups have at least one entry. Approximately two-thirds of the compounds crystallise in three space groups: 34.1 % of the lanthanides in P2(1)/c (actinides: 38.5 %), 22.1 % (20.5 %) in P1 and 8.3 % (9.0 %) in C2/c; in contrast, there are four space groups in the lanthanide group with five or fewer compounds assigned to them and 55 for the actinides. The distribution of the lanthanides into the different crystal families corresponds well to that of the actinides. If the data are compared with the study on the space group frequencies for organic compounds there are a number of important differences.

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Authors: DE RIDDER D J A, JRC Karlsruhe (DE)
Bibliographic Reference: Article: Journal of Alloys and Compounds, Vol. 223 (1995) pp. 280-287
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