Durch Umsetzung von Na2O und TiAs bzw. TiSb in verschweißten Tantalampullen unter Argon gelang die Darstellung der metallisch grauen und sehr hydrolyseempfindlichen Verbindungen Na2Ti2As2O bzw. Na2Ti2Sb2O. Sie kristallisieren tetragonal innenzentriert in einem modifizierten anti‐K2NiF4‐Typ [1] (modifizierter Eu4As2O‐Typ [2, 3]), Raumgruppe I4/mmm (Nr. 139) mit den Gitterkonstanten für Na2Ti2As2O: a = 407,0(2) pm, c = 1528,8(4) pm und für Na2Ti2Sb2O: a = 414,4(0) pm, c = 1656,1(1) pm.
Magnetische Messungen an Pulverproben von Na2Ti2Sb2O weisen auf antiferromagnetische Wechselwirkungen innerhalb der Ti—O‐Schichten hin. Ein Test auf supraleitende Eigenschaften nach der AC‐shielding‐Methode erbrachte bis zu Temperaturen von 4 K keinen Hinweis für das Auftreten von Abschirmströmen.
Syntheses and properties of 5-fluoro-, chloro-bromo-, and iodo-substituted 1,2-dimethylindazolium-3-carboxylates as new representatives of pseudo-cross-conjugated heterocyclic mesomeric betaines are described, and results of an X-ray single crystal analysis of the nonhalogenated parent compound are presented. These betaines decarboxylate on heating to yield 5-halo-1,2-dimethylindazol-3-ylidenes, which
In(C6F5)3 · CH3CN and In(C6F5)3 · glyme were synthesized from InCl3 and Cd(C6F5)2 in CH3CN or glyme in 43% and 35% yield, respectively. Replacement of CH3CN or (C2H5)2O by DMAP yielded the corresponding 1 : 1‐adduct.
[PNP][In(C6F5)4] was best prepared from the corresponding cesium salt which was best synthesized from the reaction of stoichiometric amounts of In(C6F5)3 · CH3CN, (CH3)3 SiC6F5 and CsF in good yield.
[PNP][In(C6F5)4] crystallizes in the triclinic space group P 1, a = 1104.9(4) pm, b = 1442.4(6) pm, c = 1833.8(8) pm, α = 110.87(2)°, β = 92.04(3)°, γ = 96.55(3)°, Z = 2.
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