X-ray radiation-induced amorphization of metal–organic frameworks

Literature Information

Publication Date 2019-05-29
DOI 10.1039/C9CP01463B
Impact Factor 3.676
Authors

Remo N. Widmer, Giulio I. Lampronti, Nicola Casati, Stefan Farsang, Thomas D. Bennett, Simon A. T. Redfern


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Abstract

We report the amorphization of three metal–organic frameworks, ZIF-4, ZIF-62, and ZIF-zni, by synchrotron X-ray radiation. Complete amorphization of these structures occurs on timescales ranging from minutes to hours. This process is non-isokinetic in all three cases, given a varying transformation rate as the transformation proceeds. The underlying mechanism bears the signature of inhomogeneous nucleation, reflected by an increasing local Avrami exponent over time. Furthermore, the amorphization rate accelerates with increasing temperature, even far below the usual thermal stability limit of each crystalline phase. These results not only have important implications for interpretation of X-ray synchrotron studies on the stability of metal–organic frameworks, they also shed light on the rarely-discussed and generally unpredictable experimental problem of beam damage in organic and inorganic compounds in general.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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