F. Kraus, S. Baer, A. Karttunen
Jul 1, 2011
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4
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Journal
Zeitschrift für anorganische und allgemeine Chemie
Abstract
We present the low-temperature synthesis of potassium hexaamido zirconate(IV) from the transition metal tetrafluoride and thealkali metal dissolved in liquid ammonia at –40 °C. Potassium hexaamido zirconate(IV) K2[Zr(NH2)6] is the first ternary amide reported for elements of group 4 of the periodic table It crystallizes with a novel structure type in the trigonal space group Rc with a = 6.5422(2) A, c = 32.824(2) A, V = 1216.66(9) A3, Z = 6 and c/a = 5.017. The structure can be derived from the K2PtCl6 type. The compound contains discrete D3-symmetric [Zr(NH2)6]2– anions which differ significantly from octahedral shape. Quantum chemical calculations show the distortion to arise from a splitting of degenerate d-orbitals on the zirconium atom leading to a significant gain in energy.