普鲁士蓝色类型的高质子导电性和磁性排序的干扰效应
Shin-Ichi Ohkoshi1, Kosuke Nakagawa, Keisuke Tomono
1Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. ohkoshi@chem.s.u-tokyo.ac.jp
Journal of the American Chemical Society
|April 28, 2010
概括
和协调聚合物具有高质子导电性. 研究人员发现,在磁相过渡温度附近,磁性排序和离子运输之间存在相互作用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 磁力学 磁力学 是一种
背景情况:
- 在协调聚合物中的质子导电性对于能源应用至关重要.
- 了解磁性和离子运输之间的关系是一个持续的挑战.
研究的目的:
- 合成和描述基于和的新型协调聚合物.
- 研究这些材料的质子导电性和磁性.
- 探索磁性排序和离子导电之间的合.
主要方法:
- 合成 (II) 六甲 (III) 和 (II) 六甲 (III) 协调聚合物.
- 使用电化学阻抗光谱学进行质子导电性测量.
- 测量磁性易感度以确定磁性排序和相位过渡.
主要成果:
- 实现了高质子导电率为1.2 x 10 (((-3) S cm ((-1) 的Co[Cr ((CN)) 6)) 2/3).zH ((2) O和1.6 x 10 ((-3) S cm ((-1) 的V[Cr ((CN)) 6)) 2/3).zH ((2) O.
- 在磁相过渡温度以下观察到磁性排序和离子导电之间的干扰效应.
- 结果表明,磁性排序对质子运输有很大的影响.
结论:
- 和协调聚合物显示出对潜在应用具有有前途的质子导电性.
- 观察到的磁性和离子性质之间的合为设计功能性材料提供了新的途径.
- 对磁离子合机制的进一步研究可能会导致电化学设备的先进材料.
相关概念视频
Colors and Magnetism
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 eye.
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 eye.
Valence Bond Theory
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...
π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Paramagnetism
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...
Crystal Field Theory - Octahedral Complexes
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...


