Temperature Driven Transformation of the Flexible Metal-Organic Framework DUT-8(Ni).
bond rearrangement
interpenetrated MOF
phase transition
thermal response
thermally-induced phase transformation
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
04 Oct 2022
04 Oct 2022
Historique:
received:
25
04
2022
pubmed:
9
7
2022
medline:
9
7
2022
entrez:
8
7
2022
Statut:
ppublish
Résumé
DUT-8(Ni) metal-organic framework (MOF) belongs to the family of flexible pillared layer materials. The desolvated framework can be obtained in the open pore form (op) or in the closed pore form (cp), depending on the crystal size regime. In the present work, we report on the behaviour of desolvated DUT-8(Ni) at elevated temperatures. For both, op and cp variants, heating causes a structural transition, leading to a new, crystalline compound, containing two interpenetrated networks. The state of the framework before transition (op vs. cp) influences the transition temperature: the small particles of the op phase transform at significantly lower temperature in comparison to the macroparticles of the cp phase, transforming close to the decomposition temperature. The new compound, confined closed pore phase (ccp), was characterized by powder X-ray diffraction and spectroscopic techniques, such as IR, EXAFS, and positron annihilation lifetime spectroscopy (PALS). Thermal effects of structural transitions were studied using differential scanning calorimetry (DSC), showing an overall exothermic effect of the process, involving bond breaking and reformation. Theoretical calculations reveal the energetics, driving the observed temperature induced phase transition.
Identifiants
pubmed: 35802315
doi: 10.1002/chem.202201281
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e202201281Subventions
Organisme : DFG
ID : 448809307
Organisme : DFG
ID : 464857745
Organisme : DFG
ID : 419941440
Organisme : Swedish Research Council Formas
ID : 2020-00831
Informations de copyright
© 2022 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.
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