Darstellung, Struktur und Eigenschaften einer neuen Modifikation von NbI5 / Preparation, Structure and Properties of a New Modification of NbI5

Abstract

Abstract Triclinic niobium(V) iodide was prepared from the elements at an iodine pressure of 3-4 bar in a temperature gradient from 400 to 230 °C. It crystallizes in the space group P1̄ with a = 7.591(3), b = 10,322(3), c = 6.977(3) Å, α = 90.93(3), β = 116.17(3), γ = 109.07(3)°, Z = 2 Nbls. The single-crystal X-ray structure analysis shows the compound to contain dimeric Nb2I10 molecules with Nb-I bond lengths of 2.933 and 2.939(1) A for the bridge bonds and of 2.639···2.720(1) Å for the terminal bonds. The structure is isotypic with triclinic β-UCl5. The infrared spectrum indicates stretching vibrations at 148, 202, 214 and 242 cm-1 .