和3-(3,4-di-hydroxy-phen-yl) 烯酸酸盐水合物
Irén Bieler1, Christoph Wagner1, Kurt Merzweiler1
1Martin-Luther-Universität Halle Wittenberg, Naturwissenschaftliche Fakultät II, Institut für Chemie, Germany.
概括
这项研究从咖啡酸中合成了新的和协调聚合物. 这些化合物表现出独特的链状结构和结网络,为金属有机材料设计提供了洞察力.
科学领域:
- 协调化学 协调化学
- 材料科学 材料科学 材料科学
- 晶体学 晶体学是指结晶学.
背景情况:
- 咖啡酸 (3-(3,4-di-hydroxy-phenyl) 酸) 是一种天然存在的具有多种生物活性的化合物.
- 有机酸的金属复合物因其结构多样性和潜在应用而引起人们的兴趣.
- 了解咖啡酸与金属的协调行为可以导致新的功能材料.
研究的目的:
- 合成和表征咖啡酸与和的新协调聚合物.
- 为了阐明由此产生的和复合物的晶体结构.
- 研究这些金属有机化合物中的协调模式和网络形成.
主要方法:
- 咖啡酸与氧化 (LiOH) 和氧化 (NaOH) 在水溶液中的反应.
- 单晶X射线衍射分析以确定合成化合物的晶体结构.
- 对协调环境,结合模式和结合相互作用的分析.
主要成果:
- 聚[aqua-[μ-3-(3,4-二-基--) 甲] (1) 和聚[aqua-[μ-3-(3,4-二-基-) 甲] (2) 的形成.
- 1的晶体结构具有四面体离子和咖啡酸的μ3-κ3协调,形成链状结构.
- 2的晶体结构显示了七坐标的离子,形成连接的协调多面体和三周期网络.
结论:
- 咖啡酸与LiOH和NaOH的反应产生了不同的协调聚合物结构.
- 复合物 (1) 通过碳酸盐桥接和结合形成1D链.
- 复合体 (2) 呈现出更复杂的3D网络结构,原因是更高的协调数和桥接模式.
相关概念视频
01:19Acid Halides to Alcohols: LiAlH4 Reduction
2.8K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.8K
00:42Ionic Bonds
118.3K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.3K
03:11Precipitation of Ions
27.9K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.9K
03:34Ionic Compounds: Formulas and Nomenclature
66.9K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
66.9K
01:17Esters to Alcohols: Hydride Reductions
3.5K
Esters are reduced to primary alcohols when treated with a strong reducing agent like lithium aluminum hydride. The reaction requires two equivalents of the reducing agent and proceeds via an aldehyde intermediate.
Lithium aluminum hydride is a source of hydride ions and functions as a nucleophile. The mechanism proceeds in three steps. Firstly, the nucleophilic hydride ion attacks the carbonyl carbon of the ester to form a tetrahedral intermediate. Subsequently, the carbonyl group re-forms,...
Lithium aluminum hydride is a source of hydride ions and functions as a nucleophile. The mechanism proceeds in three steps. Firstly, the nucleophilic hydride ion attacks the carbonyl carbon of the ester to form a tetrahedral intermediate. Subsequently, the carbonyl group re-forms,...
3.5K
02:54Trends in Lattice Energy: Ion Size and Charge
23.9K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.9K