Phase transitions and transformations in metal-organic framework materials
Event details
| Date | 02.06.2016 |
| Hour | 16:00 › 17:00 |
| Speaker |
Prof. Anthony K. Cheetham, University of Cambridge Bio: Prof. Cheetham was educated at St Catherine's College, Oxford in 1965 to study chemistry, and graduated with a first class BA in 1969. He started his doctorate at Wadham College, Oxford in the same year, preparing a dissertation on 'The Structures of some Non-stoichiometric Compounds', which he completed in 1971. After receiving his doctorate he became a lecturer at Lincoln College, Oxford. In 1974 he became the Lecturer in Chemical Crystallography, and in 1990 he became Reader in Organic Materials. He moved to the United States a year later to take up a position as Professor of Materials and Chemistry at the University of California, Santa Barbara, moving back to the United Kingdom in 2007 to become Goldsmiths' Professor of Materials Science at University of Cambridge. His area of research is that of inorganic materials, involving their synthesis, characterization and application. He is working on the development of advanced methods for the chemical and structural characterization of polycrystalline materials and the application of the techniques to the study of zeolite catalysts, molecular sieves and optical materials. |
| Location |
EPFL Valais Wallis/Zeuzier conference room
|
| Category | Conferences - Seminars |
Our current research on metal-organic frameworks (MOFs) focuses primarily on their physical properties, including their remarkable mechanical, optical, magnetic, ferroelectric and electronic behaviour. We have worked extensively on the amorphization of MOFs, which can be induced thermally, under pressure, or by milling [1]. In certain cases we have been able to form glassy MOFs by quenching of the molten state [2].
I shall discuss several cases of phase transitions that depend heavily on framework flexibility. These include the transition from a porous to a dense framework at 160K in the Zeolitic Imidazolate Framework, ZIF-4, which is accompanied by a decrease in volume of ~23% [3].
A second example involves a reversible, pressure-induced phase transition in a dense rare-earth formate, which shows the breaking and making of bonds during a transition that is accompanied by a 10% change in volume [4]. In addition, we shall explore chemical transformations that depend on flexibility. These include the topochemical dehalogenation of a copper trithiocyanurate framework that is accompanied by a change from an insulating crystalline phase to an amorphous semiconductor [5], an insulator to proton conductor transition that is driven by hydration [6], and an in situ study of the successive crystallization of MOFs with increasing stability [7].
Finally, a brief summary of some of our recent work on hybrid perovskites will also be presented [8].
1. T. D. Bennett and A. K. Cheetham, Accounts of Chemical Research 47, 1555 (2014)
2. T. D. Bennett, J. C. Tan, Y. Z. Yue, C. Ducati, N. Terrill, H.H.M. Yeung, Z. Zhou, S. Henke, A. K. Cheetham and G. N. Greaves, Nature Comm. 6, 8079 (2015)
3. M. T. Wharmby, S. Henke, T. D. Bennett, Y. Yue, C. Mellot-Draznieks, and A. K. Cheetham, Angew. Chem. Intl. Ed. 54, 6447 (2015)
4. E. C. Spencer, M. S. R. N. Kiran, Wei Li, U. Ramamurty, N. L. Ross and A. K. Cheetham, Angew. Chem. Intl. Ed. 53, 5583 (2014)
5. S. Tominaka, T. Suga, T. D. Bennett and A. K. Cheetham, Chem. Sci. 6, 1465 (2015)
6. S. Tominaka, F. X. Coudert, T. D. Dao, T. Nagao and A. K. Cheetham, J. Amer. Chem. Soc. 137, 6428 (2015)
7. H.H.M. Yeung, Y. Wu, S. Henke, A. K. Cheetham, D. O’Hare and R. I. Walton, Angew. Chem. Intl. Ed. Eng. 55, 2012 (2016)
8. S. Sun, S. Tominaka, J.-H. Lee, S. F. Xie, P. D. Bristowe and A. K. Cheetham, APL Materials, 4, 031101 (2016); F. Wei, Z. Deng, S. Sun, F. Xie, G. Kieslich, D. M. Evans, M. A. Carpenter, P. D Bristowe and A. K. Cheetham, Materials Horizons (to be published 2016)
I shall discuss several cases of phase transitions that depend heavily on framework flexibility. These include the transition from a porous to a dense framework at 160K in the Zeolitic Imidazolate Framework, ZIF-4, which is accompanied by a decrease in volume of ~23% [3].
A second example involves a reversible, pressure-induced phase transition in a dense rare-earth formate, which shows the breaking and making of bonds during a transition that is accompanied by a 10% change in volume [4]. In addition, we shall explore chemical transformations that depend on flexibility. These include the topochemical dehalogenation of a copper trithiocyanurate framework that is accompanied by a change from an insulating crystalline phase to an amorphous semiconductor [5], an insulator to proton conductor transition that is driven by hydration [6], and an in situ study of the successive crystallization of MOFs with increasing stability [7].
Finally, a brief summary of some of our recent work on hybrid perovskites will also be presented [8].
1. T. D. Bennett and A. K. Cheetham, Accounts of Chemical Research 47, 1555 (2014)
2. T. D. Bennett, J. C. Tan, Y. Z. Yue, C. Ducati, N. Terrill, H.H.M. Yeung, Z. Zhou, S. Henke, A. K. Cheetham and G. N. Greaves, Nature Comm. 6, 8079 (2015)
3. M. T. Wharmby, S. Henke, T. D. Bennett, Y. Yue, C. Mellot-Draznieks, and A. K. Cheetham, Angew. Chem. Intl. Ed. 54, 6447 (2015)
4. E. C. Spencer, M. S. R. N. Kiran, Wei Li, U. Ramamurty, N. L. Ross and A. K. Cheetham, Angew. Chem. Intl. Ed. 53, 5583 (2014)
5. S. Tominaka, T. Suga, T. D. Bennett and A. K. Cheetham, Chem. Sci. 6, 1465 (2015)
6. S. Tominaka, F. X. Coudert, T. D. Dao, T. Nagao and A. K. Cheetham, J. Amer. Chem. Soc. 137, 6428 (2015)
7. H.H.M. Yeung, Y. Wu, S. Henke, A. K. Cheetham, D. O’Hare and R. I. Walton, Angew. Chem. Intl. Ed. Eng. 55, 2012 (2016)
8. S. Sun, S. Tominaka, J.-H. Lee, S. F. Xie, P. D. Bristowe and A. K. Cheetham, APL Materials, 4, 031101 (2016); F. Wei, Z. Deng, S. Sun, F. Xie, G. Kieslich, D. M. Evans, M. A. Carpenter, P. D Bristowe and A. K. Cheetham, Materials Horizons (to be published 2016)
Practical information
- General public
- Free
Organizer
- Prof. Berend Smit
Contact
- Constance Visser Witman