铜柱状液晶 ((I) 具有离子导电性和固态发射的复合体
Viorel Cîrcu1, Constantin P Ganea2, Mihail Secu2
1Department of Inorganic and Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, 4-12 Regina Elisabeta Bld., Sector 5, 030018 Bucharest, Romania.
Molecules (Basel, Switzerland)
|May 27, 2023
概括
新的铜(I) 化物复合物表现出液晶性,排放性和质子导电性质. 这些金属聚合物因其热稳定性和独特的结构特性而显示出对先进材料的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 协调化学 协调化学
背景情况:
- 铜 ((I) 化物复合物因其多样性的特性而引起人们的兴趣.
- 尿素配体可以形成复杂的超分子结构.
- 液晶材料具有独特的自组装和电子性能.
研究的目的:
- 合成和表征新的中性铜 (I) 化物复合物.
- 研究这些复合物的超分子,液晶,辐射和离子导电性质.
- 探索这些材料在先进应用中的潜力.
主要方法:
- 通过降解合成铜 (II) 化物与二甲基尿素 (BTU) 配体.
- 使用ESI-MS,元素分析,IR和NMR光谱学进行结构性表征.
- 通过DSC,POM和XRD进行半形态行为分析.
- 使用TG分析进行热稳定性评估.
- 通过固态光谱学测量的发射特性.
- 用可变温度介电光谱学研究的电性质.
主要成果:
- 成功合成了两个中性铜化物复合物[Cu(BTU) 2X] (X = Cl, Br).
- 这些复合体表现出2D超分子结构和液晶状的行为,在广泛的温度范围内 (>100 K) 具有六边形柱状中位相.
- 观察到高达同位素化温度的良好热稳定性.
- 检测到高达8%的量子收益率的固态辐射.
- 无水质子导电在液晶相内的结网促进,在高温下达到2.97 × 10−7 S·cm−1 (Cl) 和1.37 × 10−6 S·cm−1 (Br) 的导电性.
结论:
- 合成的铜(I) 复合物具有独特的特性组合,包括液晶性,排放性和质子导电性.
- 在BTU连接体中的结网络在使质子导电在中相中发挥着至关重要的作用.
- 这些金属聚合物对在需要自组装和离子运输的功能性材料中的应用具有前景.
相关概念视频
02:37Metallic Solids
18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
43.2K
Tetrahedral 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 (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,...
43.2K
02:42Ionic Crystal Structures
14.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.5K
02:58Crystal Field Theory - Octahedral Complexes
26.9K
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...
26.9K
03:02Colors and Magnetism
12.0K
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...
12.0K
00:56Extraction: Advanced Methods
497
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
497