通过水分子介导的LnIII-MII MOF中的异构质子导电性:实验和计算见解
Martín Esteves1, Fernando Igoa Saldaña2, Aldana Plátano2
1Área Física y Centro NanoMat, DETEMA, Facultad de Química, Universidad de la República, 11800 Montevideo, Uruguay.
Inorganic chemistry
|September 6, 2025
概括
新的金属有机框架 (MOF) 显示出出色的质子导电性. 单晶测量显示高效的质子运输沿着孔径,与当前固态电解质竞争未来的设备应用.
科学领域:
- 材料科学
- 固态化学
- 纳米技术
背景情况:
- 金属有机框架 (MOF) 是具有可调节结构的多孔晶体材料.
- 在燃料电池等能源应用中,
- 开发高效稳定的质子导体仍然是一个关键挑战.
研究的目的:
- 使用氧化乙酸盐 (oda^2-) 合成和表征同结构MOF.
- 研究这些新型MOF材料的质子导电特性.
- 阐明质子传输机制,并确定影响导电性的因素.
主要方法:
- 三种同结构MOF的合成和结晶学表征:LaCo,PrCo和LaNi.
- 在MOF道内分析结网络的计算模拟.
- 在不同的湿度和温度条件下测量粉末和单晶导电性.
主要成果:
- 合成的MOF,La2Co3 () 6 (H2O) 6·14H2O (LaCo),Pr2Co3 () 6 (H2O) 6·14H2O (PrCo) 和La2Ni3 () 6 (H2O) 6·14H2O (LaNi),具有形成结网的客水分子.
- 粉末导电性测量显示了格罗图斯型的质子传输机制,尽管受粒边界效应的限制.
- 单晶导电性测量表明PrCo具有高度异性导电性,在孔道上有显著的质子传输 (σ ≈ 10^-1 S·cm^-1 在316 K,100% RH).
结论:
- 研究的MOF表现出有前途的质子导电能力,特别是PrCo.
- 格罗图斯机制和异性传导突出显示了MOF在质子运输应用中的潜力.
- 这些发现为设计基于MOF的先进质子导体设备提供了基础.
相关概念视频
02:51Metal-Ligand Bonds
21.5K
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...
21.5K
02:58Crystal Field Theory - Octahedral Complexes
27.4K
Crystal Field Theory
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...
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...
27.4K
03:13Intermolecular Forces
61.0K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
61.0K
02:40MO Theory and Covalent Bonding
11.2K
The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
11.2K
02:42Valence Bond Theory
9.2K
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...
9.2K
03:02Colors and Magnetism
12.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.3K