Single-Crystal X-ray and Solution <sup>13</sup>C NMR Study of Fluoro(<i>p</i>-nitrophenyl)bis(triphenylphosphine)palladium(II). Are There Effects of Through-Conjugation?
作者:William J. Marshall、David L. Thorn、Vladimir V. Grushin
DOI:10.1021/om980529t
日期:1998.11.1
The Pd−F and Pd−C bond distances in the X-ray structure of trans-fluoro(p-nitrophenyl)bis(triphenylphosphine)palladium(II), 1, are shorter by ca. 0.036 and 0.013 Å, respectively, than those in the analogous σ-phenyl complex, 2. This structural feature along with the 13C NMR spectral characteristics of 1 and its iodo counterpart indicates a contribution from the quinoid-type canonical form A to the
反式氟(对硝基苯基)双(三苯基膦)钯(II)1的X射线结构中的Pd-F和Pd-C键距短约1倍。分别比类似的σ-苯基络合物2的0.036和0.013Å 。该结构特征以及1及其碘代对应物的13 C NMR光谱特征表明,醌型规范形式A对1的结构有贡献。然而,1中对硝基苯基配体的几何形状没有表现出贯通共轭效应,这表明反式的共振效应-[(Ph 3 P)2 Pd(F)]比NH 2和MeO弱。