Crystal structures of Octacyanomolybdates(IV). III - (NMe4)(3)Li[Mo(CN)(8)]center dot 3.5H(2)O and Cs7Na[Mo(CN)(8)](2)center dot 4.17H(2)O: Examples of dodecahedral and square antiprismatic eight-coordination [German]

摘要

At single crystals of the hydrated tetragonal cyano complexes (NMe4)(3)Li[Mo(CN)(8)]. 3.5H(2)O (a=1707.5(3), c = 1054.9(2) pm, space group P42(1)m, Z = 4) and Cs7Na[Mo(CN)(8)](2). 4.17 H2O (a = 1547.9(1), c = 3254.6(6) pm, I4(1)/a, Z = 8) X-ray structure determinations were performed. The [Mo(CN)(8)](4-) polyhedra agree with respect to their mean distances Mo-C and C-N (216,7/114,3 pm resp. 216,1/114,7 pm) within their standard deviations, however, there is a distorted dodecahedron in the first case ((NMe4)(3)Li-complex), and a distorted square antiprism in the second (Cs7Na-complex). The coordination of the counter cations, partly hydrated, the formation of hydrogen bridges and the packing of the complex anions is discussed. [References: 26]