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Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Direct Sintering Behavior of Metal Organic Frameworks/Coordination Polymers.

Izuru Miyazaki¹, Yumi Masuoka¹, Akitoshi Suzumura¹

¹Toyota Central R&D Labs., Inc., Nagakute, Aichi480-1192, Japan.

|January 2, 2023

Summary

This study explores sintering in metal-organic frameworks/coordination polymers (CPs), finding that melting CPs like ZPI exhibit significant shrinkage (10-20%) via localized melting, unlike non-melting ZIF-8 (<1%).

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Area of Science:

Materials Science
Chemical Engineering
Crystallography

Background:

Metal-organic frameworks/coordination polymers (CPs) are versatile materials with potential applications in various fields.
Understanding the processing of CPs, such as sintering, is crucial for their practical implementation.
Distinguishing sintering behavior between melting and non-melting CPs is key for material processing optimization.

Purpose of the Study:

To investigate the sintering behavior and mechanisms of melting ([Zn(HPO4)(H2PO4)2]·2H2Im, ZPI) and non-melting (ZIF-8) CPs.
To characterize the physical and microstructural changes during CP sintering.
To correlate sintering parameters with macroscopic properties like shrinkage and density.

Main Methods:

Compaction and subsequent sintering of ZPI and ZIF-8 CPs.
Physical characterization including measurement of shrinkage and apparent density.
Microstructural analysis to understand sintering mechanisms at different temperatures.

Main Results:

Sintering behavior is dependent on temperature, heating rate, and CP properties, particularly meltability.
Melting CP (ZPI) showed significant shrinkage (10-20%) driven by localized melting, while non-melting ZIF-8 showed <1% shrinkage.
Increased sintering temperature led to decreased apparent density in ZPI, indicating complex structural changes beyond simple densification.

Conclusions:

Localized melting is a dominant sintering mechanism for melting CPs at higher temperatures.
Significant shrinkage in melting CPs does not necessarily translate to increased material density.
The findings provide insights for optimizing manufacturing conditions for melting CPs using established sintering techniques.