Nitrido-Sodalithe. I Synthese,Struktur und Eigenschaften von Zn7–xH2x[P12N24]Cl2 mit 0 ⩽ x ⩽ 3 |
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Authors: | W Schnick J Lücke |
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Abstract: | Nitrido Sodalites. I Synthesis, Crystal Structure, and Properties of Zn7–xH2x P12N24]Cl2 with 0 ? x ? 3 The nitrido sodalites Zn7–xH2xP12N24]Cl2 with 0 ? x ? 3 are obtained by heterogeneous pressure-ammonolysis of P3N5 at presence of ZnCl2 (T = 650°C). These compounds are available too by reaction of ZnCl2, (PNCl2)3, and NH4Cl at 700°C. The crystal structures of four representatives of the above mentioned compounds have been refined by the Rietveld full-profile technique using X-ray powder diffractometer data (I4 3m, a = 821.61(4) to 824.21(1) pm, Z = 1). In the solid a three-dimensional framework of corner-sharing PN4-tetrahedra occurs (P? N: 163.6 pm, P? N? P: 125.6°, mean values) which is isosteric with the sodalite type of structure. In the center of the β-cages Cl? ions have been found, which are tetrahedrally coordinated by Zn2+ ions. The Zn2+ ions are statistically disordered. According to the phase-width observed (0 ? x ? 3) the Zn2+ ions may be partially replaced each by two hydrogen atoms which on the other hand are covalently bonded to nitrogen atoms of the P? N framework. The IR-spectra of these compounds show characteristic vibrations. |
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Keywords: | Phosphorus nitrides nitrido sodalites synthesis crystal structure i r data |
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