Über Hydroxoniccolate(II) und Hydroxocobaltate(II)

Abstract

Darstellung und Eigenschaften der kristallisierten Hydroxoniccolate(II) Ba2[Ni(OH)6], Sr2[Ni(OH)6] und Na2[Ni(OH)4] werden beschrieben. In Abhängigkeit von der Temperatur erhält man Na2[Ni(OH)4] in zwei Modifikationen. Nach dem röntgenographischen Befund entspricht die Tieftemperaturmodifikation dem schon früher beschriebenen Hydroxocobaltat(II) Na2[Co(OH)4]. Nunmehr konnte auch diese Verbindung in einer entsprechenden Hochtemperaturform unter extremen Bedingungen dargestellt werden.

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“…For the preparation of theophrastite the method of Scholder and Giesler was modi®ed [27]. In a te¯on¯ask, 152 g NaOH and 48 g H 2 O were heated to 140 C. When all NaOH pellets were melted an aqueous solution prepared of 10 g Ni(ClO 4 ) 2 Â 6 H 2 O and 6 g H 2 O was added dropwise.…”

Bivalent Metal Hydroxides

“…of NaOH 1.6 X w-3 1.0 X w-2 1.1 X w-l 1.0 8 to 15 Conc.ofNi(OHh I x i0- 7 4 x i0-7 2 x i0-6 6 x i0-6 -6 x io-6 (according to Gayer and Garrett [195] In cool, concentrated NaOH which contains 0.5 mole of brenzcatechol per mole Ni(OHh, the latter is dissolved under formation of a complex brenzcatecholhydroxoanion [172].…”

“…'Very pure' hydroxide was made by Scholder and Giesler [172] through precipitation of aqueous Ni(Cl04) 2 solution with 63% aqueous NaOH, and heating the precipitate under its mother liquor to 110 oc for several days. The microcrystals, well-suited for filtering, are washed with much water.…”

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“…The method employs the hydrolysis reaction of Na 2 [Ni(OH) 4 ] which was obtained by a method proposed by Scholder and Giesler [9]. The method employs the hydrolysis reaction of Na 2 [Ni(OH) 4 ] which was obtained by a method proposed by Scholder and Giesler [9].…”