Synthesis, phase transitions and vitrification of the zeolitic imidazolate framework: ZIF-4

J.Y. Zhang, Ang Qiao, H.Z. Tao, Yuanzheng Yue

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

To produce bulk MOF glasses with high quality and yield, it is important to synthesize their parent crystals with less defects, high homogeneity and low solvent inclusions. To understand the phase transition and polyamorphic transition in ZIFs, it is crucial to know the nature of the parent crystals. For these two purposes, we perform a systematic study by varying the solvothermal synthesis condition of ZIF-4 (Zn[C3N2H3]2) crystals. We found that pure ZIF-4 crystals could be obtained at synthetic temperatures (Ts) below 383 K for 72 h, or for durations (ts) shorter than 96 h at 393 K. An increase in Ts shifts Tg to higher values. Only under a specific synthetic condition (e.g., at 393 K for 72 h), where pure ZIF-4 crystals form (i.e., without ZIF-zni formation), can the low-density amorphous phase occur. The origins of the above-mentioned phenomena are discussed.

Original languageEnglish
Article number119665
JournalJournal of Non-Crystalline Solids
Volume525
ISSN0022-3093
DOIs
Publication statusPublished - 2019

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vitrification
Vitrification
Phase transitions
Crystals
synthesis
crystals
homogeneity
inclusions
Glass
Temperature
Defects
temperature
glass
shift
defects

Cite this

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title = "Synthesis, phase transitions and vitrification of the zeolitic imidazolate framework: ZIF-4",
abstract = "To produce bulk MOF glasses with high quality and yield, it is important to synthesize their parent crystals with less defects, high homogeneity and low solvent inclusions. To understand the phase transition and polyamorphic transition in ZIFs, it is crucial to know the nature of the parent crystals. For these two purposes, we perform a systematic study by varying the solvothermal synthesis condition of ZIF-4 (Zn[C3N2H3]2) crystals. We found that pure ZIF-4 crystals could be obtained at synthetic temperatures (Ts) below 383 K for 72 h, or for durations (ts) shorter than 96 h at 393 K. An increase in Ts shifts Tg to higher values. Only under a specific synthetic condition (e.g., at 393 K for 72 h), where pure ZIF-4 crystals form (i.e., without ZIF-zni formation), can the low-density amorphous phase occur. The origins of the above-mentioned phenomena are discussed.",
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language = "English",
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journal = "Journal of Non-Crystalline Solids",
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Synthesis, phase transitions and vitrification of the zeolitic imidazolate framework: ZIF-4. / Zhang, J.Y.; Qiao, Ang; Tao, H.Z.; Yue, Yuanzheng.

In: Journal of Non-Crystalline Solids, Vol. 525, 119665, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Synthesis, phase transitions and vitrification of the zeolitic imidazolate framework: ZIF-4

AU - Zhang, J.Y.

AU - Qiao, Ang

AU - Tao, H.Z.

AU - Yue, Yuanzheng

PY - 2019

Y1 - 2019

N2 - To produce bulk MOF glasses with high quality and yield, it is important to synthesize their parent crystals with less defects, high homogeneity and low solvent inclusions. To understand the phase transition and polyamorphic transition in ZIFs, it is crucial to know the nature of the parent crystals. For these two purposes, we perform a systematic study by varying the solvothermal synthesis condition of ZIF-4 (Zn[C3N2H3]2) crystals. We found that pure ZIF-4 crystals could be obtained at synthetic temperatures (Ts) below 383 K for 72 h, or for durations (ts) shorter than 96 h at 393 K. An increase in Ts shifts Tg to higher values. Only under a specific synthetic condition (e.g., at 393 K for 72 h), where pure ZIF-4 crystals form (i.e., without ZIF-zni formation), can the low-density amorphous phase occur. The origins of the above-mentioned phenomena are discussed.

AB - To produce bulk MOF glasses with high quality and yield, it is important to synthesize their parent crystals with less defects, high homogeneity and low solvent inclusions. To understand the phase transition and polyamorphic transition in ZIFs, it is crucial to know the nature of the parent crystals. For these two purposes, we perform a systematic study by varying the solvothermal synthesis condition of ZIF-4 (Zn[C3N2H3]2) crystals. We found that pure ZIF-4 crystals could be obtained at synthetic temperatures (Ts) below 383 K for 72 h, or for durations (ts) shorter than 96 h at 393 K. An increase in Ts shifts Tg to higher values. Only under a specific synthetic condition (e.g., at 393 K for 72 h), where pure ZIF-4 crystals form (i.e., without ZIF-zni formation), can the low-density amorphous phase occur. The origins of the above-mentioned phenomena are discussed.

U2 - 10.1016/j.jnoncrysol.2019.119665

DO - 10.1016/j.jnoncrysol.2019.119665

M3 - Journal article

VL - 525

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

M1 - 119665

ER -