Reversible Switching between Nonporous and Porous Phases of a New SIFSIX Coordination Network Induced by a Flexible Linker Ligand
Closed-to-open structural transformations in flexible coordination networks are of potential utility in gas storage and separation. Herein, we report the first example of a flexible SiF -pillared square grid material, [Cu(SiF )(L) ] (L = 1,4-bis(1-imidazolyl)benzene), . exhibits reversible switching...
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| Published in: | Journal of the American Chemical Society Vol. 142; no. 15; p. 6896 |
|---|---|
| Main Authors: | , , , , , , , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
United States
15.04.2020
|
| ISSN: | 1520-5126, 1520-5126 |
| Online Access: | Get more information |
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| Summary: | Closed-to-open structural transformations in flexible coordination networks are of potential utility in gas storage and separation. Herein, we report the first example of a flexible SiF
-pillared square grid material, [Cu(SiF
)(L)
]
(L = 1,4-bis(1-imidazolyl)benzene),
.
exhibits reversible switching between nonporous (
) and several porous (
,
,
, and
) phases triggered by exposure to N
, CO
, or H
O. In addition, heating
to 433 K resulted in irreversible transformation to a closed polymorph,
. Single-crystal X-ray diffraction studies revealed that the phase transformations are enabled by rotation and geometrical contortion of L. Density functional theory calculations indicated that L exhibits a low barrier to rotation (as low as 8 kJmol
) and a rather flat energy surface. In situ neutron powder diffraction studies provided further insight into these sorbate-induced phase changes.
combines stability in water for over a year, high CO
uptake (ca. 216 cm
/g at 195 K), and good thermal stability. |
|---|---|
| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1520-5126 1520-5126 |
| DOI: | 10.1021/jacs.0c01314 |