SYNTHESIS AND CRYSTAL-STRUCTURE OF CALCIU M IMIDE, CANH

Single-crystals of calcium imide were obtained for the first time by t he reaction of a mixture of calcium amide with sodium amide at 850 deg rees C in an autoclave for salt melts. After cooling the autoclave to room temperature the crystals are embedded in solid Na which was extra cted by liquid ammonia. The structure of calcium imide was determined from single-crystal diffractometer data:space group <Fm(3)over bar m>, Z = 4, a = 5.143(1) Angstrom, R/R(w) = 0.032/0.028 mit N(F-o(2) great er than or equal to 3 sigma(F-o(2))) = 26, N(Var.) = 5. Ca and N atoms are arranged in the motif of the NaCl structure type. The hydrogen at oms of the imide groups are disordered within the Ca octahedra, and th ey occupy a six fold split position.