[MeNC5H5]2[TCNE]2 (TCNE = tetracyanoethylene). Single crystal X-ray and neutron diffraction characterization of an exceptionally long 2.8 Å C-C bond
[MeNC5H5]2[TCNE]2 (TCNE = tetracyanoethylene). Single crystal X-ray and neutron diffraction characterization of an exceptionally long 2.8 Å C-C bond
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[MeNC5H5]2[TCNE]2（TCNE = 四氰乙烯）。
作者：
Piccoli P
碘化N-甲基吡啶鎓、MCN +I−和四氰基乙烯（TCNE）反应形成[MCN]2[TCNE]2，其具有[TCNE]22−，在50 K时X射线衍射的二聚体内C-C键距离为2.806（1）<$，在50 K时中子衍射的二聚体内C-C键距离为2.801（4）<$。在红外光谱中，它在2191、2174、2169、2163处有νC N吸收，在1366 cm−1处有νCC吸收，在26，880和18，520 cm−1处有UV/维斯吸收带。对阳离子-氢与[TCNE]22−相互作用的分析没有提供证据表明阳离子稳定了[TCNE]22−二聚体的形成，而[TCNE]22−二聚体是通过二聚体内2 e −-4中心C-C键合相互作用稳定的。
The reaction of N-methylpyridinium iodide, Mepy+I−, and tetracyanoethylene (TCNE) forms [Mepy]2[TCNE]2, which possesses [TCNE]22− with an intradimer C–C bond distance of 2.806(1) Å at 50 K from X-ray diffraction, and 2.801(4) Å at 50 K from neutron diffraction. In the IR it exhibits νC≡N absorptions at 2191, 2174, 2169, 2163 and a νCC absorption at 1366 cm−1, with UV/Vis absorption bands at 26,880 and 18,520 cm−1. Analysis of the cation-hydrogen to [TCNE]22− interactions do not provide evidence that the cation stabilizes formation of the [TCNE]22− dimer, which is stabilized by the intradimer 2e−-4 center C–C bonding interaction.