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Sr3[MnN3] (hexag. P63/m (Nr. 176); a = 764.2(1) pm, c = 529.8(1) pm; Z = 2) and Ba3[MnN3] (hexag. P63/m (Nr. 176); a = 805.0(2) pm, c = 558.6(1) pm; Z = 2) are isotypes of the Ba3[FeN3] crystal structure and contain trigonal-planar anions [MnN3]6- with D3h-symmetry (Mn—N: 174.1(13) pm/173.7(12) pm). The compounds were prepared by reaction of mixtures of Li, Sr/Ba and Mn (molar ratio 2:1:1) in tungsten crucibles with nitrogen (1 atm) at 850°C.
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Tennstedt et al. (1993) studied this question.
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