Tin Clathrates with the Type II Structure

For a very long time, Ba16Ga32Sn104 has been the sole representative of tin clathrates with
the type
II structure. Herein, we present several new members of this structural
family: Cs8Ba16Ga39.7(3)Sn96.3(3), Rb9.9(5)­Ba13.3(2)­Ga36.4(3)­Sn99.6(3), and K2.0(4)­Ba14.0(4)­Ga30.4(2)­Sn105.6(4). The successful
synthesis of these novel compounds was facilitated through the use
of alkali and alkaline-earth metals, which selectively fill the available
cages.

长久以来，Ba₁₆Ga₃₂Sn₁₀₄一直是具有II型结构的锡笼形化合物的唯一代表。本文中，我们报道了该结构家族的数个新型成员：Cs₈Ba₁₆Ga₃₉.7(3)Sn₉₆.3(3)、Rb₉.9(5)‑Ba₁₃.3(2)‑Ga₃₆.4(3)‑Sn₉₉.6(3)以及K₂.0(4)‑Ba₁₄.0(4)‑Ga₃₀.4(2)‑Sn₁₀₅.6(4)。本研究通过碱金属与碱土金属选择性填充可用笼位的策略，成功实现了上述新型化合物的合成。