Sr 3 [Al 2 N 4 ] (Pnna, Nr. 52; a = 590.1(3), b = 1000.5(5), c = 958.0(4) pm; Z = 4) was prepared from the elements (molar ratio Sr: Al = 3:1; reaction with N 2 , 1 atm, 24 h; T max = 1100 °C). The crystal structure contains corrugated chains 1 ∞ [AlN 4/2 3- ] which consist of distorted AlN 4 tetrahedra sharing common edges (Al-N : 188.5(7)-195.8(7) pm; N-Al-N : 95.0(3)- 126.0(5)°). The nitrogen atom s form a distorted ccp arrangement. 3/4 of the octahedral holes are occupied by Sr atoms; 1/4 of the tetrahedral holes are occupied by Al atoms. Sr 3 [Al 2 N 4 ] can be described in terms of the Zintl concept (isosteric relation of [AIN 2 ] 3- to SiS 2 ).
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Blase et al. (1994) studied this question.