title: Synthesis and structure of Sr3GaN3 and Sr6GaN5: strontium gallium nitrides with isolated planar [GaN3]6- anions.
abstract: Two new strontium gallium nitrides were obtained as single crystals by reaction in molten Na. Black Sr(3)GaN(3) is isostructural with its transition metal analogues, Sr(3)MnN(3), Ba(3)MnN(3), Sr(3)CrN(3), Ba(3)CrN(3), and Ba(3)FeN(3), and is the first example of a 313-ternary nitride containing only main group metals. It crystallizes in space group P6(3)/m (No. 176) with a = 7.584(2) A, c = 5.410(3) A, and Z = 2. Black Sr(6)GaN(5) is isostructural with Ca(6)GaN(5) and also with its transition metal analogues, Ca(6)MnN(5) and Ca(6)FeN(5). It crystallizes in space group P6(3)/mcm (No. 193) with a = 6.6667(6) A, c = 12.9999(17) A, and Z = 2. Both Ga compounds contain isolated planar [GaN(3)](6)(-) nitridometallate anions of D(3)(h)() symmetry.
authors.affiliation: Baker Laboratory, Department of Chemistry, Cornell University, Ithaca, New York 14853-1301, USA.
authors.forename: Dong Gon
authors.initials: DG
authors.lastname: Park
authors.forename: Zoltán A
authors.initials: ZA
authors.lastname: Gál
authors.forename: Francis J
authors.initials: FJ
authors.lastname: DiSalvo