Polysulfonylamine. LIV: (12-Krone-4)lithiumdimesylamid-Acetonitril (3/2) : Ein Kristall mit zwei prinzipiell unterschiedlichen Konformationen des gleichen Coronanden

[Li(12-crown-4){N(SO 2 CH 3 ) 2 }] is obtained from equimolar amounts of lithium dimesylamide and 12-crown-4 in methanol and crystallizes from acetonitrile as a 3/2 solvate. The crystallographic data of the latter at -130 o C are: monoclinic, space group P 2/n, a=1053.4(3), b=904.3(3), c=2791.2(8) pm, β=95.66(3) o , V=2.646 nm 3 , Z=6, D x =1.441 Mgm -3 . Apart from CH 3 CN molecules residing in lattice cavities, the structure consists of two crystallographically independent [Li(12-crown-4){N(SO 2 CH 3 ) 2 }] ion pairs A and B in the ratio 2:1