The existence of two presumed Moe- and Mo7-periodate-complexes in aqueous solutions of various acidity was checked by ultracentrifugation and pH measurements. The experiments showed that only one complex exists and that the extent of protonation is but small.
Single-phase Pr 2 CBr was prepared by heating a mixture of PrBr 3 , Pr and C (1 : 5:3) to 1140 • C for 18 d. The crystal structure was investigated by X-ray single crystal diffraction (space group P6 3 /mmc, a = 3.8071 (3), c = 14.7787(12)Å). In the structure the Pr atoms form C-centered octahedra condensed into Pr 2 C sheets via common edges; these sheets are separated by the Br atoms which are in a trigonal prismatic environment of Pr atoms. Pr 2 CBr is a black shiny compound with metallic conductivity. It is a ferromagnet with T c = 13.8(5) K.
Wäßrige Lösungen von Natriummetavanadat wurden unter Zusatz von Natriumchlorid in der Ultrazentrifuge nach dem Gleichgewichtsverfahren untersucht. Die Auswertung erfolgte wie bei einem Zweikomponentensystem neutraler Stoffe. Es zeigte sich, daß das Metavanadation in Lösung vierfach polymerisiert vorliegt. Die Zulässigkeit einer solchen für die Mol.-Gew.-Bestimmung ausreichenden Näherung wurde durch Versuche an den Systemen BaCl2—NaCl—H2O, NaJO3—NaCl—H2O und Na6V10O28—NaCl—H2O erwiesen.
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