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Syntheses and Crystal Structures of Four New Ammoniates with Heptaarsenide (As) Anions

✍ Scribed by Tobias Hanauer; Michael Grothe; Markus Reil; Nikolaus Korber

Publisher
John Wiley and Sons
Year
2005
Tongue
German
Weight
522 KB
Volume
88
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The syntheses and X‐ray single‐crystal low‐temperature structures of the four new ammoniates [Li(NH~3~)~4~]~3~As~7~⋅NH~3~ (1), [Rb(18‐crown‐6)]~3~As~7~⋅8 NH~3~ (2), Cs~3~As~7~⋅6 NH~3~ (3), and (Ph~4~P)~2~CsAs~7~⋅5 NH~3~ (4) are reported. The compounds were obtained by either direct reduction of As with Li/Cs in liquid NH~3~, solvation of Cs~4~As~6~/Rb~4~As~6~ in liquid NH~3~, or by extraction of solid Cs~3~As~7~. While compound 1 contains isolated As$\rm{_{7}^{3-}}$ polyanions, AsM contacts (M=Na−Cs) lead to neutral [Rb(18‐crown‐6)]~3~As~7~ units in 2, a three‐dimensional, extended network in 3, and one‐dimensional, infinite $\rm{_{\infty }^{1}}$[CsAs~7~]^2−^ chains in 4, respectively.

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## Abstract The reaction of diphenyltin dichloride with the binary __Zintl__ phase K~4~Sn~9~ in the presence of excess lithium and 18‐crown‐6 in liquid ammonia led to the ammoniate [K(18‐crown‐6)(NH~3~)~2~]~2~Sn~2~Ph~4~ (1). The analogous reaction with K~4~Ge~9~ and potassium in the absence of furt