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{[Li(NH 3 ) 4 ] 2 [18-crown-6]}[Li(NH 3 ) 4 ] 2 (Sn 3  ph  6 ) 2  · 4 NH 3  was prepared by reacting diphenyltin dichloride with lithium and 18-crown-6 in liquid ammonia. The crystal structure was obtained from low temperature single crystal X-ray data ( P 2 1 / a ,  Z  = 2,  a  = 18.483(5) Å,  b  = 13.240(2) Å,  c  = 22.919(5) Å;  β  = 103.65(3)°). The structure is built from previously unknown  catena -hexaphenyltristannandiide anions, Sn 3  ph  6 , isolated tetraamminelithium complexes, and novel {[Li(NH 3 ) 4 ] 2 [18-crown-6]} 2+  cations. In the latter divalent cation, two tetraamminelithium complexes coordinate to both sides of the crown ether  via  hydrogen bonds.

Synthesis and crystal structure of {[Li(NH 3 ) 4 ] 2 [18-crown-6]}[Li(NH 3 ) 4 ] 2 (Sn 3 ph 6 ) 2 · 4 NH 3