Alkalioxoargentate(I). Über Na₃AgO₂

Abstract

Erneut dargestelltes Na3AgO2 (hell blaß‐gelbes Pulver, glasklare Einkristalle), orthorhombisch, Raumgruppe Ibam mit a = 5,463 Å, b = 10,926 Å, c = 5,926 Å, Z = 4, drö = 3,94 g · cm−3, dpyk = 3,89 g · cm−3, Lageparameter siehe Text, ist strukturell durch lineare „Hanteln”︁ [OAgO], d(Ag→O) = 2,095 Å ausgezeichnet. Es liegt eine neuartige Na2O‐Variante vor. Der Madelung‐Anteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, werden berechnet und diskutiert.

Synthesis and Crystal Structure of Rb3AgO2

“…The difference between the Madelung part of lattice energy (MAPLE) [12] of Rb 3 AgO 2 and that calculated for the sum of the binary oxides (see Table 5) is satisfactorily low (0.98 %). These data, related to the silver(I) anion, are basically in agreement for Rb 3 AgO 2 , K 3 AgO 2 [8] and Na 3 AgO 2 [3]. These data, related to the silver(I) anion, are basically in agreement for Rb 3 AgO 2 , K 3 AgO 2 [8] and Na 3 AgO 2 [3].…”

“…Alkali metal oxoargenates(I) are known to form families of the compositions AAg 3 O 2 (A ϭ Li [1], Na [2]), AAgO (A ϭ Li [3], Na [4], K [4,5], Rb [4,6,7], Cs [4,5,7]), and A 3 AgO 2 (A ϭ Na [3], K [8,9]). Within each family the constitution of the oxoargentate anion is uniformly determined by the Ag/O ratio, and the degree to which the basic linear unit AgO 2 is condensed varies from isolated (A 3 AgO 2 ) through oligomeric [Ag 4 O 4 ] (AAgO) to infinite-crosslinked 1 ϱ [AgO 2/3 ] (AAg 3 O 2 ).…”

Ein neues Oxocuprat (I): K3[CuO2]

“…Berechnet man fur die dort angegebene Kristallstruktur den Madelunganteil der Gitterenergie, MAPLE, so erhalt man zwar eine befriedigende ubereinstimmung im Ganzen, im Detail treten aber Einzelwerte (z. B. Beitrage fiir K+ zwischen 78,2 und 129 kcal/Mol) auf, die Zweifel an der Giite der Strukturbestimmung wecken [7].…”

Synthesis, Crystal Structure, and Reactivity of Na5[CuO2](OH)2

“…It is interesting that only for A = K, Rb, Cs, another structure type in the copper rich part of the phase diagram, A 3 Cu 5 O 4 [2], and an alkaline rich phase, A 3 [CuO 2 ] (A = K, Rb) [3], is known. Na 3 [CuO 2 ] [4] has been reported not to crystallize isotypic with Na 3 [AgO 2 ] [5] and A 3 [CuO 2 ] [3]. Therefore, we have studied again the sodium rich part of the phase diagram A 2 O/Cu 2 O.…”