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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Penta-, Hepta- und Oktaiodid-Anionen in Salzen mit Erdalkalimetall- Kronenether-Kationen
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Penta-, Hepta- und Oktaiodid-Anionen in Salzen mit Erdalkalimetall- Kronenether-Kationen

机译:与碱土金属冠醚阳离子形成的盐中的五,七和八肽阴离子

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Salts of alkaline earth metal cations sequestered in dibenzo-18-crown-6 (Db18c6) and benzo-15-crown-5 (B15c5), respectively, with I_5~-, I_7~- and I_8~(2-) as the anions, have been synthesized and their crystal structures determined by single-crystal X-ray diffraction. [Ca(Db18c6)(H_2O) _3](I_5)_2~- (Db18c6)(H_2O) (1): monoclinic, P2_1 (no. 4), a = 1322.1(2), b = 1849.1(2), c = 1344.0(2) pm, β = 114.70(1)°, V = 2985.2(6) × 10~6 pm~3, Z = 2; [Sr(B15c5)_2](I_7)_2 (2): triclinic, P~-1 (no. 2), a = 973.9(5), b = 1244.0(5), c = 1293.3(5) pm, a = 115.28(1), β = 90.18(1), γ = 104.57(1)°, V = 1360.2(10) × 10~6 pm~3, Z = 2; [Ba(Db18c6)_2]I _8 (3): orthorhombic, Pbcn (no. 60), a = 1452.0(2), b = 1924.6(2), c = 1912.1(2) pm, V = 5343.3(10) × 10~6 pm~3, Z = 4. Compound 1 contains two crystallographically independent V-shaped pentaiodide anions, I_5~-, which are linked to dimers by weak interionic contacts. The unusual heptaiodide anion, I_7~-, in 2 can be described as a V-shaped pentaiodide unit, which is connected to a slightly widened iodine molecule to give the rare Z form. Secondary bonding distances lead to almost planar ten-membered iodine rings, which are connected through common edges to form ribbons with staircase-like folding. 3 is built of sandwich-like cations and centrosymmetric octaiodide anions, I_8~(2-). An inspection for secondary contacts reveals that the iodine substructure of 3 consists of essentially isolated octaiodide units.
机译:碱土金属阳离子的盐分别以I_5〜-,I_7〜-和I_8〜(2-)螯合在dibenzo-18-crown-6(Db18c6)和苯并15-crown-5(B15c5)中。合成了α,β,并且其晶体结构通过单晶X射线衍射确定。 [Ca(Db18c6)(H_2O)_3](I_5)_2〜-(Db18c6)(H_2O)(1):单斜晶系,P2_1(编号4),a = 1322.1(2),b = 1849.1(2),c = 1344.0(2)pm,β= 114.70(1)°,V = 2985.2(6)×10〜6 pm〜3,Z = 2; [Sr(B15c5)_2] [I_7)_2(2):三斜晶系,P〜-1(第2号),a = 973.9(5),b = 1244.0(5),c = 1293.3(5)pm,a = 115.28(1),β= 90.18(1),γ= 104.57(1)°,V = 1360.2(10)×10〜6 pm〜3,Z = 2; [Ba(Db18c6)_2] I _8(3):斜方晶系,Pbcn(编号60),a = 1452.0(2),b = 1924.6(2),c = 1912.1(2)pm,V = 5343.3(10) ×10〜6 pm〜3,Z =4。化合物1包含两个晶体学独立的V型五碘化物阴离子I_5〜-,它们通过弱的离子间接触与二聚体相连。 2中不寻常的七碘化物阴离子I_7〜-可以描述为V形五碘化物单元,该单元连接到稍宽的碘分子上以生成稀有的Z形式。二次键合距离导致几乎平面的十元碘环,碘环通过共​​同的边缘连接在一起,形成带阶梯状折叠的丝带。图3是由夹心型阳离子和中心对称的八肽阴离子I_8〜(2-)构成的。二次接触的检查显示3的碘亚结构由基本隔离的八肽单元组成。

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