Darstellung und Kristallstrukturen von Phenyliodoantimonaten(III). Strukturkorrelation für Halogenoantimonate(III) / Preparation and Crystal Structures of Phenyliodoantimonates(III). Structural Correlation for Haloantimonates(III)

Darstellung und Kristallstrukturen von Phenyliodoantimonaten(III). Strukturkorrelation für Halogenoantimonate(III) / Preparation and Crystal Structures of Phenyliodoantimonates(III). Structural Correlation for Haloantimonates(III)
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卤代锑酸盐 (III) 的结构和晶体结构 / 卤代锑酸盐 (III) 的制备和晶体结构。

DOI:
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发表时间:
1991
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通讯作者:
C. Martin
C. Martin
中科院分区:
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文献类型:
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作者:
W. S. Sheldrick;C. Martin

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制备了苯基碘锑酸盐(III) [Et4N][Ph2SbI2] (1)、[Et4N]2[Ph2Sb2I6] (2) 和 [Hpy]3[Ph2Sb2I7] (3),并通过 X 射线结构分析确定了它们的结构。阴离子 [Ph2SbI2]⁻ 显示 ψ- 三角双锥结构,轴向 Sb-I 距离为 2.925(1) 和 3.109(1) A。在二聚阴离子 [Ph2Sb2I6]2- 和 [Ph2Sb2I7]3- 中,锑原子呈现 ψ-八面体几何形状。正如对 [Ph2SbI2]⁻ 所观察到的那样,彼此转位的末端 Sb-I 键显示出显着不同的长度。阴离子 [Ph2Sb2I7]3- 显示 Ci 对称性,在晶体对称中心有一个桥接碘原子。观察到该原子的长 Sb-I 距离为 3.404(1) A。提出了线性三中心 X-Sb…X 相互作用中相反 Sb-X 距离(X = Cl、Br、I)的结构相关性。碘锑酸盐(III)中的键价之和是对称I-Sb-I三中心键的最小值,从而反映了Sb 5 s轨道的反键影响。对于溴锑酸盐 (III),这种影响要小得多,而对于氯锑酸盐 (III),这种影响可以有效忽略。
The phenyliodoantimonates(III) [Et4N][Ph2SbI2] (1), [Et4N]2[Ph2Sb2I6] (2) and [Hpy]3[Ph2Sb2I7] (3) have been prepared and their structures established by X-ray structural analysis. The anion [Ph2SbI2]⁻ displays a ψ-trigonal bipyramidal structure with axial Sb–I distances of 2.925(1) and 3.109(1) A. In the dimeric anions [Ph2Sb2I6]2- and [Ph2Sb2I7]3- the antimony atoms exhibit ψ-octahedral geometries. As observed for [Ph2SbI2]⁻, terminal Sb–I bonds in trans-position to one another display significantly different lengths. The anion [Ph2Sb2I7]3- displays Ci- symmetry with a bridging iodine atom at the crystallographic centre of symmetry. Long Sb—I distances of 3.404(1) A are observed to this atom. A structural correlation of opposite Sb–X distances (X = Cl, Br, I) in linear three centre X–Sb ··· X interactions is presented. The sum of the bond valences in iodoantimonates(III) is a minimum for symmetrical I–Sb–I three centre bonds, reflecting thereby the antibonding influence of the Sb 5 s-orbital. This influence is considerably smaller for bromoantimonates(III) and may be effectively neglected for chloroantimonates(III).