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Synthesis and Structure of the Alkali–Metal Amalgams A3Hg20 (A=Rb, Cs), K3Hg11, Cs5Hg19, and A7Hg31 (A=K, Rb)

✍ Scribed by Evgeny Todorov; Slavi C. Sevov

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
466 KB
Volume
149
Category
Article
ISSN
0022-4596

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✦ Synopsis

The synthesis and single-crystal structures of four alkali+ metal amalgams are reported. The compounds A 3 Hg 20 (A ‫؍‬ Rb, Cs) are of new structural type (Pm-3n, Z‫,2؍‬ a ‫؍‬ 10.737(1) A s and 10.913(1) A s , for A ‫؍‬ Rb and Cs, respectively), while K 3 Hg 11 is the 5rst example of a mercury compound with the -La 3 Al 11type structure (Immm, Z ‫؍‬ 2, a ‫؍‬ 5.122(1) A s , b ‫؍‬ 10.063(2) A > , c ‫؍‬ 14.782(3) A > ). The structure of A 7 Hg 31 (A ‫؍‬ K, Rb) determined from single crystal (P6/mmm, Z ‫؍‬ 1, a ‫؍‬ 10.850(2) A > and 11.000(2) A > , c ‫؍‬ 10.210(2) A > and 10.377(3) A > , for A ‫؍‬ K and Rb, respectively) is compared with that of K 7 Hg 31 , previously known from powder di4raction only. Cs 5 Hg 19 (I4/m, Z ‫؍‬ 2, a ‫؍‬ 11.803(3) A > , c ‫؍‬ 10.814(5) A > ) is isostructural with the known Rb 5 Hg 19 .

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