Diversity of Strontium Nitridogermanates(IV): Novel Sr₄[GeN₄], Sr₈Ge₂[GeN₄], and Sr₁₇Ge₂[GeN₃]₂[GeN₄]₂

Abstract

Single crystals of three new strontium nitridogermanates(IV) were grown in sealed niobium ampules from sodium flux. Dark red Sr 4 [GeN 4 ] crystallizes in space group P 2 1 / c with a = 9.7923(2) Å, b = 6.3990(1) Å, c = 11.6924(3) Å and β = 115.966(1)°. Black Sr 8 Ge 2 [GeN 4 ] contains Ge 4– anions coexisting with [Ge IV N 4 ] 8– tetrahedra and adopts space group Cc with a = 10.1117(4) Å, b = 17.1073(7) Å, c = 10.0473(4) Å and β = 115.966(1)°. Black Sr 17 Ge 6 N 14 features the same anions alongside trigonal planar [Ge IV N 3 ] 5– units. It crystallizes in P 1 with a = 7.5392(1) Å, b = 9.7502(2) Å, c = 11.6761(2) Å, α = 103.308(1)°, β = 94.651(1)° and γ = 110.248(1)°.