Materials Data on UPb2 by Materials Project
UPb2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. U is bonded in a 9-coordinate geometry to two equivalent U and seven Pb atoms. Both U–U bond lengths are 2.49 Å. There are a spread of U–Pb bond distances ranging from 3.32–3.58 Å. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded in a 3-coordinate geometry to four equivalent U and four equivalent Pb atoms. There are a spread of Pb–Pb bond distances ranging from 3.29–3.38 Å. In the second Pb site, Pb is bonded in a 7-coordinate geometry to three equivalent U and four equivalent Pb atoms.
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