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Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance

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Published on: September 5, 2018

Microporous Cyclic Titanium-Oxo Clusters with Labile Surface Ligands.

Chaowei Zhao¹, Ying-Zi Han¹, Shuqi Dai¹

¹State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Engineering Research Center for Nano-Preparation Technology of Fujian Province, and, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.

Angewandte Chemie (International Ed. in English)

|October 24, 2017

Summary

This summary is machine-generated.

New cyclic titanium-oxo clusters (CTOC) with permanent microporosity were synthesized. These donut-shaped materials exhibit high surface areas and tunable functionalities for applications like CO2 adsorption.

Keywords:

clusters microporous materials nanocrystals surface ligands titanium oxide

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Area of Science:

Materials Science
Nanotechnology
Inorganic Chemistry

Background:

Developing novel porous materials is crucial for advancements in gas storage and separation.
Titanium-oxo clusters offer unique structural possibilities for creating advanced materials.

Purpose of the Study:

To synthesize novel cyclic titanium-oxo clusters (CTOC) with permanent microporosity.
To investigate the structural characteristics and surface properties of these CTOCs.
To explore their potential in gas adsorption and surface functionalization.

Main Methods:

Synthesis of CTOCs using ethylene glycol and monocarboxylic acid as surface ligands.
Characterization of cluster structure, including shape, size, and porosity.
Assembly of clusters into crystalline microporous solids.
Evaluation of CO2 adsorption capacity and ligand exchange experiments.

Main Results:

Successfully synthesized donut-shaped CTOCs with a {Ti32O16} backbone and permanent microporosity.
Achieved high surface areas (>660 m²/g) in the assembled crystalline solids.
Demonstrated superior CO2 adsorption capacity (40 cm³/g at 273 K, 1 atm) for solids with olefin-bearing carboxylates.
Showcased the exchangeability of ethylene glycolate ligands for surface functionalization.

Conclusions:

The synthesized CTOCs represent a new class of tunable microporous materials.
These materials show significant promise for selective gas adsorption, particularly CO2.
The facile ligand exchange offers a versatile platform for designing functional porous materials.