超混合材料:超分子组合的晶体和计算度量
Robert G Surbella1, Lucas C Ducati2, Kristi L Pellegrini3
1Department of Chemistry, The George Washington University , 800 22nd Street NW, Washington, D.C. 20052, United States.
研究人员使用actinyl tetrahalide离子 (An = U,Np,Pu) 和pyridinium离子合成了12种超分子化合物. 在这些活性物质中,具有关键的结构组合和非共价键强度.
科学领域:
- 超分子化学
- 乙化物化学
- 水晶工程
背景情况:
- 涉及actinyl离子的超分子化合物对于理解它们的化学行为至关重要.
- 基于动因的材料的自组是由非共价相互作用驱动的.
- 之前的研究还没有完全阐明在指导actinyl tetrahalide系统的组装中的作用.
研究的目的:
- 合成和表征一个包含actinyl tetrahalide离子的12个超分子化合物的家族.
- 研究替代酸在指导这些化合物的组装中的作用.
- 量化组装结构内的非共价相互作用 (和键) 的强度.
主要方法:
- 在室温下合成超分子化合物.
- 结晶学分析以确定结构图案.
- 用Kohn-Sham密度的函数计算来量化非共价相互作用强度.
- 分子中的原子量子理论 (QTAIM) 和自然键轨道 (NBO) 分析.
主要成果:
- 成功组装了12个超分子化合物与[AnO2Cl4]2- (An = U,Np,Pu) 离子和替代的离子.
- 证明了联体的静电电位是独立于行为金属中心的.
- 确立了离子在指导结构组合和决定和键强度方面的关键作用.
结论:
- 阴离子的结构和电荷分布对于控制阿克提尼四化物超分子化合物的自组合至关重要.
- 非共价相互作用,特别是键,在指导这些行为体构造物的分子层次安排方面发挥着重要作用.
- 这项研究提供了对基于actinyl的超分子系统的静电潜力和相互作用强度的详细了解.
更多相关视频
06:35Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
08:55Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
相关概念视频
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Structures of Solids
Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
Polymer Classification: Crystallinity
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
