对 (CH6N3) 2[NpO2Cl3和Rb[NpO2Cl2(H2O) ]链结构的合成,表征和密度功能理论的研究
Harindu Rajapaksha1, Grant C Benthin1, Emma L Markun1
1Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA. tori-forbes@uiowa.edu.
这项研究合成并描述了两种neptunyl(V) 链化合物,揭示了微妙的协调变化如何影响它们的结构和NP-O键强度. 密度功能理论 (DFT) 分析解释了它们的形成和结合.
科学领域:
- 无机化学 无机化学
- 动因化物化学 动因化物化学
- 固态化学 固态化学
背景情况:
- 乙烯基四复合物,如[An(V/VI) O2Cl4]2-/3-,通常形成离散的分子单元.
- 相关的水复合物表现出各种各样的拓,形成离散化合物或1D链,结构驱动因素尚未完全理解.
- 内球协调差异是行为化系统结构拓变化的关键.
研究的目的:
- 为了合成和结构性地描述两个新型的1-D尼普烯 (V) 链化合物: (CH6N3) 2[NpO2Cl3] (Np-Gua) 和Rb[NpO2Cl2 (H2O) ] (Np-Rb).
- 研究微妙的协调差异对在乙烯基化物系统中结构拓的形成的影响.
- 为了阐明使用DFT.控制这些neptunyl(V) 化合物的组装的结合和非共价相互作用 (NCIs).
主要方法:
- 合成和Np-Gua和Np-Rb.的结构特征.
- 合成化合物的振动分析.
- 周期密度函数理论 (DFT) 计算以评估结合,NCI和形成途径.
主要成果:
- 与Cs3[NpO2Cl4]相比,观察到NP-Gua (~6.5%) 和NP-Rb (~3.9%) 中NP-O键的显著减弱.
- 确定了不同的组装模式:Np-Gua通过键 (N-HCl_eq,N-HO_yl) 和Np-Rb通过阴离子相互作用 (Rb+O_yl,Rb+Cl_eq) 和键 (O_eq-HO_yl).
- DFT分析证实了1-D Np(V) 链结构中的Np-O债券疲软,并确定了Np-Gua和Np-Rb形成的前体子结构.
结论:
- 内球协调的微妙差异极为重要,决定了氨 (V) 系统中1D链拓的形成.
- DFT分析有效地将结合,非共价相互作用和振动特性与观察到的结构变化联系起来.
- 该研究提供了一个详细的理解neptunyl(V) 复杂的形成和结构偏好,至关重要的是actinide化学.
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