Ein neues Oxocuprat (I): K₃[CuO₂]

Abstract

Erstmals dargestellt wurde K3[CuO2] in Form transparenter, dunkelgelber Einkristalle aus KO0,52 und Cu2O (geschlossene Cu‐Bombe, 660°C, 25 d) und die Kristallstruktur, P41212, mit a = 859,4(O), c = 1331,9(2) pm, Z = 8, drö = 2,85 g/cm3, dpyk = 2,84 g/cm3 aufgeklärt (Vierkreisdiffraktometerdaten PW 1100, 1399 Io(hkl), MoKαR = 0,068, Rw = 0,065). Die Struktur wird durch isolierte Hanteln [OCuO] sowie durch Tetraederketten der C.P. um 2/3 der K+ charakterisiert. Der Madelunganteil der Gitterenergie, MAPLE, Effektive Koordinationszahlen, ECoN, diese über Mittlere Effektive Ionenradien, MEFIR, werden berechnet.

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

“…In fact, we observe a band located at 617 cm ±1 . This is about 50 cm ±1 lower than in K 3 complex, see also [2].…”

“…Apart from ACuO (Na±Cs) [1] no other phases of monovalent copper with sodium have been structurally characterized so far. 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].…”

“…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.…”

Synthesis and Crystal Structure of Rb3AgO2

“…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 ).…”

Untersuchungen zur Reaktivität in den Systemen A/Cu/M/O (A = Na-Cs und M = Co, Ni, Cu, Ag); Synthese und Kristallstrukturen von K3Cu5O4 und Cs3Cu5O4

“…Die Formeltypen ACuO mit A = Na±Cs [1] und A 3 CuO 2 mit A = Na, K, Rb [2] sind anhand von Einkristalldaten belegt. Die Formeltypen ACuO mit A = Na±Cs [1] und A 3 CuO 2 mit A = Na, K, Rb [2] sind anhand von Einkristalldaten belegt.…”