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首页> 外文期刊>Crystal growth & design >The C-I center dot center dot center dot O--N+ Halogen Bonds with Tetraiodoethylene and Aromatic N-Oxides
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The C-I center dot center dot center dot O--N+ Halogen Bonds with Tetraiodoethylene and Aromatic N-Oxides

机译:C-I中心点中心点中心点O - N +卤素键,四碘乙烯和芳香族N-氧化物

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The nature of C-I center dot center dot center dot O--N+ interactions, the first of its kind, between nonfluorinated tetraiodoethylene halogen bond (XB) donor and pyridine N-oxides (PyNO) are studied by single-crystal X-ray diffraction and density functional theory (DFT) calculations. Despite the nonfluorinated nature of the C2I4, the I center dot center dot O halogen bond distances are similar to well-known perfluorohaloalkane/-arene donor-PyNO analogues. With C2I4, oxygens of the N-oxides adopt exclusively mu(2)-XB coordination in contrast to the versatile bonding modes observed with perfluorinated XB donors. The C2I4 as the XB donor forms with PyNO's one-dimensional chain polymer structures in which the C2I4 center dot center dot center dot(mu-PyNO)(2)center dot center dot center dot C2I4 segments manifest two bonding motifs, namely, side-by-side (vicinal di-iodo) and head-to-head (geminal di-iodo), due to the nearly symmetric square-planar structure of the C2I4. While the attractive nature between I and O atoms is mainly electrostatic, the narrow range of C center dot center dot center dot O bond parameters demonstrates that the jr-bond between four iodine atoms also plays an important role in enhancing the sigma-hole strength. DFT-Based monodentate XB interaction energies, Delta E-int, in 13 1:1 XB complexes vary between 31.9 and 46.5 kJ mol(-)(1), the strongest remarkably exceeding the value reported for I-I center dot center dot center dot O--N+ = 42.0 kJ mol(-)(1). In the case of C2I4.(pyridine N-oxide) [31.9 kJ mol(-1)], the monodentate XB energy is on a par with perfluorinated donor complexes, namely, CF3I. (pyridine N-oxide) [31.1 kJ moI(-1)] and C6F3I. (pyridine N-oxide) [32.3 kJ mol(-1)].
机译:通过单晶X射线衍射研究了CI中心点中心点中心点O - N +相互作用,首先,在非氟化四碘亚乙烯卤素键(XB)供体和吡啶N-氧化物(PyNO)之间进行了研究密度泛函理论(DFT)计算。尽管C2I4的非熔融性,但I中心点中心点O卤素键距离类似于众所周知的全氟卤代甲烷/ -ARENE供体 - PYNO类似物。对于C2I4,与用全氟化XB供体观察到的通用粘合模式相比,N-氧化物的氧气仅采用MU(2)-XB的配位。 C2I4作为XB供体形式与Pyno的一维链聚合物结构,其中C2I4中心点中心点中心点(MU-PYNO)(2)中心点中心点中心点C2I4段表明了两个粘接图案,即侧 - 由于C2I4的几乎对称的平面结构,旁边(大邻碘)和头部到头(Geminal Di-Iodo)。虽然I和O原子之间的有吸引力的性质主要是静电,但窄范围的C中心点中心点中心点O键参数表明,四种碘原子之间的JR键也在增强Sigma-Hole强度方面发挥着重要作用。基于DFT的单兴XB交互能量,Delta E-Int,13 1:1 XB复合物在31.9和46.5 kJ摩尔( - )(1)之间变化,最强烈超过II中心点中心点中心点o的最强烈值--n + = 42.0 kj mol( - )(1)。在C2I4的情况下。(吡啶N-氧化物)[31.9 kJ摩尔(-1)],单齿XB能量是用全氟化供体复合物的甲基,即CF 3I。 (吡啶N-氧化物)[31.1 KJ MOI(-1)]和C6F3I。 (吡啶N-氧化物)[32.3 kJ mol(-1)]。

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