Single-crystal structure determination of two new ternary bis­muthides: Rh6Mn5Bi18 and RhMnBi3

• Published in: Acta crystallographica. Section C, Structural chemistry Structural chemistry, 2018-06, Vol.74 (Pt 7), p.863-869
• Main Authors: Kainzbauer, Peter, Richter, Klaus W., Effenberger, Herta Silvia, Marker, Martin C. J., Ipser, Herbert
• Format: Article
• Language: English
• Subjects: Research Papers
• ISSN: 2053-2296
• DOI: 10.1107/S2053229618009087

A study of the ternary Rh–Mn–Bi phase diagram revealed the existence of two new ternary bis­muthides, viz. hexa­rhodium penta­manganese octadecabismuthide (Rh 6 Mn 5 Bi 18 ) and rhodium manganese tribismuthide (RhMnBi 3 ). Their crystal structures represent new structure types. A study of the ternary Rh–Mn–Bi phase diagram revealed the existence of two new ternary bis­muthides, viz. hexa­rhodium penta­manganese octa­deca­bis­muthide (Rh 6 Mn 5 Bi 18 ) and rhodium manganese tribismuthide (RhMnBi 3 ). Their crystal structures represent new structure types. Rh 6 Mn 5 Bi 18 , with a Wyckoff sequence a f 2 g 2 i 5, crystallizes in the tetra­gonal system (space group P 4 2 / mnm ; Pearson symbol tP 58), and RhMnBi 3 , with a Wyckoff sequence a c g i q , crystallizes in the ortho­rhom­bic system ( Cmmm ; oS 20). In the Rh 6 Mn 5 Bi 18 structure, the transition metal atoms are linked into ribbon-like structural units aligned along the [001] direction, whereas planar sheets are formed in RhMnBi 3 . In both crystal structures, the units formed by the transition metal atoms are enveloped by Bi atoms, which themselves form a loosely bound network. The linkage results in a layer structure for RhMnBi 3 , while in the case of Rh 6 Mn 5 Bi 18 , a three-dimensional network is formed; the latter, however, contains several areas where Bi⋯Bi distances suggest van der Waals inter­actions. Both phases under discussion have analogous structural motifs.