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Solid-state reaction of Ca, CaCl 2 , Sr, SrCl 2 , C and BN at 900°C for 3 days yielded transparent red needles of Ca 2.57(4) Sr 0.43(4) Cl 2 [CBN] as minority product (&lt;10%) mixed with crystals of isotypic yellow Ca 3 Cl 2 [CBN] and orange Sr 3 Cl 2 [CBN]. Ca 2.57(4) Sr 0.43(4) Cl 2 [CBN] crystallizes in the space group  Pnma  (no.62) with the unit cell parameters of  a =1389.2(6),  b =386.05(15) and  c =1131.2(4)pm ( Z =4). The Raman spectrum confirms the presence of the [CBN] 4−  unit. The incremental volume of the [CBN] 4−  is calculated to be 50.7(10)Å 3 .

Synthesis, single-crystal structure determination and Raman spectrum of Ca 2.57(4) Sr 0.43(4) Cl 2 [CBN]