title: Synthesis and Structure of Two New Strontium Germanium Nitrides: Sr(3)Ge(2)N(2) and Sr(2)GeN(2).
abstract: We report the structures of two new strontium germanium nitrides synthesized as crystals from the elements in sealed Nb tubes at 750 degrees C using liquid Na as a growth medium. Sr(3)Ge(2)N(2) is isostructural with the previously reported Ba analogue. It crystallizes in P2(1)/m (No. 11), with a = 9.032(2) Å, b = 3.883(1) Å, c = 9.648(2) Å and beta = 112.42(3) degrees, and has two formula units per unit cell. It contains GeN(2)(4)(-) units and additionally |Ge(2)(-) zigzag chains. Sr(2)GeN(2) crystallizes in P4(2)/mbc (No. 135) with a= b = 11.773(2) Å and c= 5.409(1) Å and has Z = 8. It also contains GeN(2)(4)(-) units which have 18 valence electrons and, consequently are bent, like the isoelectronic molecule SO(2).
authors.affiliation: Department of Chemistry, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301.
authors.forename: S. J.
authors.initials: SJ
authors.lastname: Clarke
authors.forename: G. R.
authors.initials: GR
authors.lastname: Kowach
authors.forename: F. J.
authors.initials: FJ
authors.lastname: DiSalvo