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The Crystal Structures of {Li3(12-crown-4)2[HC(CN)2]3}, {Na(lS-~rown-5)[HC(CN)~]}, and {NaN(nBu)4[HC(CN),]2 . THF}The preparation and the crystal structures of the title com-sodium ion is coordinated by the five oxygen atoms of the pounds 1 -3 are described. 1 forms a polymeric chain struc-crown ether molecule and by one nitrogen atom of the dicyture, in which one of the lithium ions is linked by anomethanide ion. 3 has a threedimensional network, in which Li.-NCC(H)CN.-bridges. The remaining lithium ions form the sodium ions are coordinated in a distorted tetrahedral (12-crown-4)Li[NCC(H)CN] units, which are coordinated by manner by the nitrogen atoms of the dicyanomethanide ions. one of the nitrogen atoms of the dicyanomethanide ions with In the cavities of the network the tetrabutylammonium ions the lithium ions of the chain. 2 forms an ion pair, in which the and the THF molecules are found.

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