Crystal structures of some complex chlorides of trivalent and tetravalent plutonium

Abstract

The compounds K 2PuCl 5, Rb 2PuCl 5 K 2PuCl 6, and Rb 2PuCl 6 have been prepared. The latter two compounds were verified to contain only Pu(IV) by chemical analysis and spectrophotometry in solid and solution. The crystal structure of these compounds were determined by x-ray powder (Debye-Scherrer and Guinier) diffraction. The results are as follows: • K 2PuCl 5: Orthorhombic, Pnma, K 2PrCl 5 type [1]. a = 12.67 ± 0.003, b = 8.728 ± 0.00202, c = 7.970 ± 0.002 Å. • Rb 2PuCl 5: Orthrohombic, Pnma, K 2PrCl 5 type [1]. a = 13.078 ± 0.005, b = 8.908 ± 0.003, c = 8.177 ± 0.004 Å. • K 2PuCl 6: Monoclinic, C2/m, C2/m, distorted K 2PtCl 6 type. a = 10.45 ± 0.03, b = 10.12 ± 0.03, c = 10.47 ± 0.05 Å; β = 92.7 ± 0.2 ° (tentative assignment). • Rb 2PuCl 6: Hexagonal, P6 3mc, Rb 2GeF 6 type [2]. a = 7.374 ± 0.005, c = 11.91 ± 0.001 Å.