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Figure 3
(a) The planar [XeF5]− ion (present in CSD structure SOBWAH) maximizes the lone-pair repulsion so that the F atoms occupy the apices of a pentagonal bipyramid. (b) The `seesaw' shape of dibromodimethylselenium (RIZMIW), where the lone pair occupies an equatorial position in a trigonal bipyramid to minimize lone-pair–bonding-pair repulsions.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 43| Part 5| October 2010| Pages 1208-1223
doi:10.1107/S0021889810024155
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