...
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Side-Bonded Pd-η~2-(C_2H_2)_(1, 2) and Pd_2-η~2-(C_2H_2) Complexes: Infrared Spectra and Density Functional Calculations
【24h】

Side-Bonded Pd-η~2-(C_2H_2)_(1, 2) and Pd_2-η~2-(C_2H_2) Complexes: Infrared Spectra and Density Functional Calculations

机译:侧键合Pd-η〜2-(C_2H_2)_(1,2)和Pd_2-η〜2-(C_2H_2)配合物:红外光谱和密度泛函计算

获取原文
获取原文并翻译 | 示例
           

摘要

Laser-ablated palladium atoms react with acetylene in excess argon to form the strong Pd-η~2-(C_2H_2) and Pd-η~2-(C_2H_2)_2 π complexes. The C-C and C-H stretching modes and two C-H deformation modes are observed in the matrix infrared spectrum and identified through isotopic substitution (~(13)C_2H_2, C_2D_2, C_2HD) and density functional theory (DFT) isotopic frequency calculations. The Pd(C_2H_2) complex is characterized by a C-C stretching mode near 1710 cm~(-1) and a 39.8 kcal/mol binding energy predicted by DFT. The antisymmetric C-C stretching mode for Pd-η~2-(C_2H_2)_2 is observed at 1765 cm~(-1). The Pd_2-η~2-(C_2H_2) complex produced from the reaction of two Pd atoms with C_2H_2 is characterized by a C-C mode at 1566 cm~(-1). The interaction between atomic Pd and C_2H_2 involves a small amount of charge transfer based on NBO analysis, which is enhanced by a Pd_2 dimer coordinated to C_2H_2. As a result, Pd_2 dimer can reduce the C-C triple bond to a double bond. These complexes represent first steps in the Pd-C_2H_2 interaction culminating in acetylene chemistorbed on palladium.
机译:激光烧蚀的钯原子与过量氩气中的乙炔反应,形成强Pd-η〜2-(C_2H_2)和Pd-η〜2-(C_2H_2)_2π配合物。在基质红外光谱中观察到C-C和C-H拉伸模式以及两个C-H变形模式,并通过同位素置换(〜(13)C_2H_2,C_2D_2,C_2HD)和密度泛函理论(DFT)同位素频率计算来识别。 Pd(C_2H_2)配合物的特征在于在1710 cm〜(-1)附近的C-C拉伸模式和DFT预测的39.8 kcal / mol结合能。在1765 cm〜(-1)处观察到Pd-η〜2-(C_2H_2)_2的反对称C-C拉伸模式。由两个Pd原子与C_2H_2反应生成的Pd_2-η〜2-(C_2H_2)络合物的特征在于1566 cm〜(-1)处的C-C模式。基于NBO分析,原子Pd与C_2H_2之间的相互作用涉及少量电荷转移,这是通过与C_2H_2配位的Pd_2二聚体增强的。结果,Pd_2二聚体可以将C-C三键还原为双键。这些络合物代表了Pd-C_2H_2相互作用的第一步,最终达到了钯上乙炔的化学反应。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号