Quenchable Porous High-Temperature Polymorph of Sodium Imidazolate, NaIm
(2021) Crystal Growth & Design — Vol. 21, n° 2, p. 770-778 (2021)
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- Abstract
- The novel high-temperature polymorph of sodium imidazolate reported in this paper was discovered in the mechanochemical reaction of NaIm with NaBH4 and later prepared directly by thermal treatment of the room-temperature polymorph of NaIm. Solid-state NMR was used for initial elucidation of structural features; the crystal structure was determined by single-crystal X-ray diffraction, while the in situ HT-XRPD experiments utilizing synchrotron radiation have been performed in order to gain the insight into the structural evolution and thermal stability, in addition to differential thermal analysis and hot-stage microscopy measurements. Contrary to the RT polymorph that forms a dense and hypercoordinated structure without pores, the high-temperature polymorph of NaIm exhibits pores of 50 Å3 that suggest possible application for gas sorption/separation. It is important to highlight that, once formed, the high-temperature polymorph of NaIm retains its structure and remains stable at room temperature.
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Citations
Burazer, S., Robeyns, K., Guénée, L., Mali, G., Morelle, F., Ban, V., Klaser, T., Filinchuk, Y., Černý, R., & Popović, J. (2021). Quenchable Porous High-Temperature Polymorph of Sodium Imidazolate, NaIm. Crystal Growth & Design, 21(2), 770-778. https://doi.org/10.1021/acs.cgd.0c01006 (Original work published 2021)