对于高氧化状态的代复合物的稳定性,连接物设计标准
Tyler-Rayne Nero1, Chad M Studvick2, Andrew C Boggiano1
1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States.
Inorganic chemistry
|January 13, 2026
概括
我们合成了一种新的 imidophosphorane 配体,NPC2,以稳定高氧化状态的兰化物复合物. 该NPC3连接体提供卓越的固体保护,增强Pr4+和Pr5+复合物的稳定性和电化学可逆性.
科学领域:
- 无机化学 无机化学
- 有机金属化学 有机金属化学
- 兰化物化学 兰化物化学
背景情况:
- 高氧化状态的兰化物复合物难以分离,因为需要特定的连接体环境.
- 平衡电子捐赠,硬质量和配体氧化还原稳定性对于稳定这些物种至关重要.
研究的目的:
- 为了合成和表征新的 imidophosphorane 连接物用于兰化物复合物稳定.
- 研究连接体结构对Ce和Pr复合物的氧化还原特性和稳定性的影响.
- 为了探索高氧化状态兰坦化物种的可访问性.
主要方法:
- 合成了一种新型的 imidophosphorane 配体,NPC2 ([NP(tBu) 2(pyrr) ]-).
- 准备和表征同质的Ce (III) 和Pr (III) 复合体与NPC2.2.
- 电化学研究 (循环电压测量) 和密度函数理论 (DFT) 计算.
- 与相关的NPCx连接体 (NPC1,NPC3) 和NP*连接体系统进行比较分析.
主要成果:
- 该NPC2连接体支持同质的Ce (III) 和Pr (III) 复合体,使其能够获得Ce (IV),Pr (IV) 和Pr (V).
- 对于NPC2支持的Ce和Pr复合体,获得了结构,电化学和计算数据.
- 跨NPCx系列的干替代显示了对氧化还原潜力的适度影响,表明最小的f-轨道扰动.
- 由于更强的固体保护,NPC3为Pr(IV) 和Pr(V) 复合物提供了增强的稳定性,提高了电化学可逆性和化学稳定性.
结论:
- 固态负荷,电子捐赠能力和对电离子效应是稳定高氧化状态兰化物复合物的关键因素.
- 与NPC1和NPC2相比,NPC3连接体在稳定高氧化状态的Pr复合物方面表现优越,与NPC1和NPC2相比.
- DFT计算合理化了关于对联体替代的氧化还原电位不敏感性的实验观测.
相关概念视频
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
788
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
788
01:19Complexation Equilibria: The Chelate Effect
1.2K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.2K
02:51Metal-Ligand Bonds
23.9K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.9K
02:58Properties of Transition Metals
29.5K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.5K
02:54Coordination Compounds and Nomenclature
26.2K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
26.2K
02:42Valence Bond Theory
11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K