NA2MN(NH2)(4) - A NEW-TYPE OF LAYERED STR UCTURE

The structure of Na2Mn(NH2)(4) was solved by X-ray single crystal data including H-positions: P2(1)/c, Z = 4, a = 6.331(1) Angstrom, b = 14. 542(3) Angstrom, c = 7.212(1) Angstrom, beta = 116.29(1)degrees, Z(F-o (2) greater than or equal to 3 sigma = (F-o(2))) = 1343, Z(parameters) = 96, R/R-w = 0.023/0.029. The compound crystallizes in a new type of structure. Within layered blocks the amide ions are arranged with the motif of a hexagonal closest packing of spheres. Within these blocks alternating layers contain sodium in all octahedral sites and manganes e in an ordered way in a quarter of tetrahedral sites.