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Stereoisomerism

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...

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...

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Author Spotlight: Accelerating Discovery in Microporous Material Chemistry

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From Anisotropic Aluminum-MOF Rods to Oriented Membranes: Stepwise Coordination-Editing for Geometry-Governed Isomer

Jingxian Hua¹, Zemin Li¹, Yurong Luo¹

¹State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.

Journal of the American Chemical Society

|April 10, 2026

Summary

Researchers developed a new method to create oriented metal-organic framework (MOF) membranes with aligned channels. This breakthrough enables efficient separation of C6 isomers, crucial for light naphtha processing.

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Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Oriented metal-organic framework (MOF) membranes with 1D channels are ideal for molecular separations due to reduced transport path length.
Challenges in synthesizing oriented Al-MOF membranes include high coordination barriers and anisotropic growth, often leading to compromised integrity and performance.

Purpose of the Study:

To develop a novel synthesis strategy for creating highly oriented Al-MOF membranes with improved integrity and separation performance.
To overcome the limitations of conventional nucleation-growth methods for anisotropic MOF membrane fabrication.

Main Methods:

A stepwise coordination-editing synthesis strategy was employed, utilizing a prestructured coordination (PSC) scaffold.
The PSC scaffold facilitates an endogenous crystallization pathway, promoting collective directional development of Al-O-Al connectivity.
Thermal activation triggers bond rearrangement within the scaffold, initiating aligned channel formation without external nucleation or intergrowth.

Main Results:

The first highly 1D channel-oriented Al-bttotb membranes were successfully fabricated using the endogenous crystallization approach.
These membranes demonstrated efficient liquid-phase separation of C6 isomers, relevant to light naphtha processing.
The membranes exhibited high permeation fluxes for linear alkanes and superior separation factors compared to existing technologies.

Conclusions:

Endogenous crystallization offers a viable alternative pathway for fabricating functional anisotropic Al-MOF membranes.
The developed membranes show significant potential for industrial applications in molecular separations, particularly for light naphtha processing.
This strategy overcomes previous limitations, enabling robust, highly aligned MOF membranes with enhanced transport properties.