The Diammoniates of Dipotassiumtetraethinylozincate and -cadmate: K2M(C2H)4·2NH3 (M = Zn, Cd)
详细信息 查看全文
- 作者：Ulrich Cremer ; Ingo Pantenburg ; and Uwe Ruschewitz
- 刊名：Inorganic Chemistry
- 出版年：2003
- 出版时间：December 1, 2003
- 年：2003
- 卷：42
- 期：24
- 页码：7716 - 7718
- 全文大小：121K
- 年卷期：v.42,no.24(December 1, 2003)
- ISSN：1520-510X
文摘
By reaction of KC2H and K2Zn(CN)4 in liquid ammonia, thediammoniate K2Zn(C2H)4·2NH3 was obtained. K2Cd(C2H)4·2NH3was synthesized by reacting KC2H, Cd(NH2)2, and acetylene inliquid ammonia. The crystal structures of the air and temperaturesensitive compounds were determined by X-ray single crystaldiffraction at low temperatures (T = 170 K). Both compoundscrystallize in the monoclinic space group I2/a (No. 15) with Z =4. K2Zn(C2H)4·2NH3: a = 7.289(1) Å, b = 12.765(2) Å, c =14.066(2) Å, 
= 98.11(2)
. K2Cd(C2H)4·2NH3: a = 7.444(1) Å,b = 12.619(3) Å, c = 14.304(2) Å, = 98.94(1). Characteristicstructural motifs are tetrahedral [M(C2H)4]2- fragments (M = Zn,Cd) and zigzag chains of edge sharing distorted (C2H)6 octahedracentered by potassium ions. These zigzag chains are connectedby a second type of crystallographically distinct potassium ionsthat also bind to two ammonia molecules.
= 98.11(2). K2Cd(C2H)4·2NH3: a = 7.444(1) Å,b = 12.619(3) Å, c = 14.304(2) Å, = 98.94(1). Characteristicstructural motifs are tetrahedral [M(C2H)4]2- fragments (M = Zn,Cd) and zigzag chains of edge sharing distorted (C2H)6 octahedracentered by potassium ions. These zigzag chains are connectedby a second type of crystallographically distinct potassium ionsthat also bind to two ammonia molecules.