Why is the antipodal effect in closo-1-SB9H9 so large? A possible explanation based on the geometry from the concerted use of gas electron diffraction and computational methods.

Why is the antipodal effect in closo-1-SB9H9 so large? A possible explanation based on the geometry from the concerted use of gas electron diffraction and computational methods.
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为什么 closo-1-SB9H9 的反足效应如此之大?

DOI:
10.1039/c1dt10053j
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发表时间:
2011
期刊:
2003)
影响因子:
--
通讯作者:
Hnyk D
Hnyk D
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作者:
Hnyk D

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本文用气体电子衍射和量子化学计算确定了1-硫杂-闭-癸硼烷(9)的分子结构。假设C4 v对称,笼形结构从对称的双帽正方形反棱柱(D4 d对称性)主要通过邻近硫的硼原子的四面体带的大量膨胀而扭曲。S-B和(B-B)平均距离分别由rh 1 = 193.86(14)和182.14(8)pm确定。使用MP2(full)/6-311++G** 方法和先前报道的水平[MP2(full)/6- 311 G **,B3 LYP/6- 311 G ** 和B3 LYP/cc-pVQZ]计算的几何参数,以及计算的振动振幅和11 B NMR化学位移,与实验结果吻合良好。特别是,GIAO-MP2计算很好地再现了顶端B(10)的所谓对映化学位移(71.8 ppm),并示意性地解释了其大幅度,十二顶点闭合-1-SB 11 H11中B(12)的类似对映化学位移也是如此。
The molecular structure of 1-thia-closo-decaborane(9), 1-SB9H9, has been determined by the concerted use of gas electron diffraction and quantum-chemical calculations. Assuming C4v symmetry, the cage structure was distorted from a symmetrically bicapped square antiprism (D4d symmetry) mainly through substantial expansion of the tetragonal belt of boron atoms adjacent to sulfur. The S–B and (B–B)mean distances are well determined with rh1 = 193.86(14) and 182.14(8) pm, respectively. Geometrical parameters calculated using the MP2(full)/6-311++G** method and at levels reported earlier [MP2(full)/6-311G**, B3LYP/6-311G** and B3LYP/cc-pVQZ], as well as calculated vibrational amplitudes and 11B NMR chemical shifts, are in good agreement with the experimental findings. In particular, the so-called antipodal chemical shift of apical B(10) (71.8 ppm) is reproduced well by the GIAO-MP2 calculations and its large magnitude is schematically accounted for, as is the analogous antipodal chemical shift of B(12) in the twelve-vertex closo-1-SB11H11.
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