相关实验视频

Updated: Jan 15, 2026

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

Published on: October 10, 2013

极地三基非金属有机框架显示增强的吸附

Megan O'Shaughnessy¹, Hang Qu¹, Xue Wang¹

¹Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, United Kingdom.

Journal of the American Chemical Society

|October 16, 2025

概括

研究人员在多孔非金属有机框架 (N-MOF) 中发现了多态性,确定了三基框架的两个稳定阶段. 一个阶段显示出异常的吸收,超过许多其他多孔材料.

科学领域:

材料科学
化学学
纳米技术

背景情况:

多孔非金属有机框架 (N-MOF) 是一种有前途的材料类别,可用于气体分离,储存和催化.
多态性,即固体物质以多种晶体形式存在的能力,在许多材料中很常见,但在多孔的N-MOF中迄今尚未实验观察到.

研究的目的:

在多孔N-MOF中呈现第一个多态性的实验证据.
描述不同多态相的结构和气体吸附特性.

主要方法:

合成和单晶X射线衍射用于识别和确定三基框架的两个多态相 (T.Cl-α和T.Cl-β) 的结构.
在冷温度下测量了气体吸附等温体 (CO2,N2,H2),以评估N-MOF多态的孔隙性和气体吸收能力.

主要成果:

确定了三基框架的两个稳定的多孔相,T.Cl-α和T.Cl-β,提供了N-MOF多态性的第一个实验证据.
确定了两个同结构多孔N-MOF,T.Cl-α和T.Br-α的单晶结构.
所有已识别的多态体都表现出对CO2和N2的多孔性.
T.Cl-α阶段在77 K和1 bar时表现出显著的7.2 mmol g−1的吸收,明显超过大多数其他多孔晶体,与许多金属有机框架 (MOF) 相比.

结论:

在多孔N-MOF中发现的多态性为材料设计和性能调整开辟了新的途径.
由于伦敦分散相互作用和几何限制,T.Cl-α的异常吸收突显了N-MOF在先进气体储存应用中的潜力.
对N-MOF多态性的进一步研究可能会为特定的工业应用,如气体分离和催化而定制材料.

更多相关视频

Author Spotlight: Accelerating Discovery in Microporous Material Chemistry

Author Spotlight: Accelerating Discovery in Microporous Material Chemistry

Published on: October 6, 2023

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

Published on: April 28, 2023

相关概念视频

Aromatic Hydrocarbon Cations: Structural Overview

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Molecular Shape and Polarity

Molecular Shape and Polarity

Dipole Moment of a Molecule

Aromatic Hydrocarbon Anions: Structural Overview

Aromatic Hydrocarbon Anions: Structural Overview

Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...