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The compound K 2 [SnBi] was prepared by reaction of stoichiometric amounts of the elements in graphitized quartz ampoules. K 2 [SnBi] crystallizes in the orthorhombic system, space group Pbcm (No 57), Z = 4, with a = 680,4(3), b = 1339,(4) and c = 649,9(3) pm. The crystal structure of K 2 [SnBi] is characterized by folded infinite  1  ∞ [SnBi] zigzag chains of alternating Sn and Bi atoms. The chains are bent at each Bi atom, the Sn atoms are located at the fold of the chain. Apart from the two covalent Sn-Bi bonds, each Sn atom has two additional collinear Sn-Sn contacts in direction of the fold of the chain which in terms of partial bonds can be assigned a bond order of one half. The repeating unit of the chain [Sn 2 Bi 2 ] 4−  is strongly related to the isoelectronic butterfly [Si 4 ] 6−  in Ba 3 Si 4 .

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Ein neues Baumuster für ein heteronukleares 11 - Valenzelektronensystem: gefaltete  1  ∞ [SnBi] 2- Zickzack-Ketten in der Struktur von K 2 [SnBi] / A Novel Structure Pattern for a Heteronuclear 11 Valence Electron System: Folded  1  ∞ [SnBi] 2-  Zigzag Chains in the Structure of K 2 [SnBi]