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相关概念视频

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

977
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
977
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
26.2K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

949
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
949
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

1.7K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
1.7K
Multiple Halogenation of Methyl Ketones: Haloform Reaction01:28

Multiple Halogenation of Methyl Ketones: Haloform Reaction

2.0K
A method involving the transformation of methyl ketones to carboxylic acids using excess base and halogen is called the haloform reaction. It begins with the deprotonation of α hydrogen to form an enolate ion which reacts with the electrophilic halogen to give an α-halo ketone. The step continues until all the α protons are substituted to form a trihalomethyl ketone. The resulting molecule is unstable, and in the presence of a hydroxide base, it readily undergoes nucleophilic...
2.0K
Halogenation of Alkenes02:46

Halogenation of Alkenes

15.4K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
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相关实验视频

Updated: Jun 10, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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素驱动单晶到单晶转换工程基于集群的旋转交叉框架.

Guang Yang1, Ze-Yu Ruan1, Yan-Cong Chen1

  • 1Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, IGCME, Guangdong Basic Research Center of Excellence for Functional Molecular Engineering, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.

Angewandte Chemie (International ed. in English)
|October 11, 2024
PubMed
概括

我们报告了一种基于集群的新型旋转交叉 (SCO) 金属有机框架 (MOF) 具有罕见的拓. 这种MOF可以通过逐步的单晶转换转化为具有修改SCO特性的新框架.

关键词:
集群集群是一个集群集群.铁是铁,铁是铁,铁是铁.金属有机框架单晶转化为单晶的转化过程旋转十字路口 旋转十字路口

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科学领域:

  • 材料科学 材料科学 材料科学
  • 协调化学 协调化学
  • 超分子化学 超分子化学

背景情况:

  • 基于集群的旋转交叉 (SCO) 框架是新兴的智能金属有机框架 (MOF).
  • 这些材料由于其多样化的结构和拓,具有独特的可比性质.
  • 开发具有可调节性质的新SCO MOF对于先进应用至关重要.

研究的目的:

  • 报告一个基于集群的新型SCO框架,具有非常罕见的3,4,6-T108拓.
  • 通过单晶到单晶 (SCSC) 转换来证明合成后修饰 (PSM) 的可行性.
  • 调查这些转变对上海合作组织行为的影响.

主要方法:

  • 一个新的基于集群的SCO框架的合成 [Fe3{Ag4{CN) 6{H2O) }2{TPBA) 3{ClO4) 2·7DMF (1).
  • 利用网状化学原理进行后合成修饰 (PSM).
  • 进行了连续的单晶到单晶 (SCSC) 转换,以改变框架拓和组成.

主要成果:

  • 合成的框架 (1) 具有 3,4,6-T108 拓与 n 倍波罗姆纠网络.
  • 实现了3,4,6-T108拓MOF到urk拓框架 (2_X,X=Cl,Br,I) 的第一个SCSC转换.
  • 证明了连续的SCSC转换 (2_Cl → 2_Br → 2_I),并观察到由素替代驱动的SCO修饰行为.

结论:

  • 该研究提出了设计基于集群的SCO MOF的新策略.
  • 成功演示了SCSC转换,用于创建新的MOF拓和功能.
  • 这些发现为开发先进的智能功能多孔材料铺平了道路.