Reversible First-Order Single Crystal to Single Crystal Thermal Phase Transition in [(CH3)3CNH3]4[V4O12]
| Autor: | Pablo Vitoria, Ana Wéry, Leire San Felices, Laura Bravo-García, Estibaliz Ruiz-Bilbao, José Laza, José Vilas, Juan Gutiérrez-Zorrilla |
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| Rok vydání: | 2022 |
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| Zdroj: | Addi. Archivo Digital para la Docencia y la Investigación instname Materials; Volume 15; Issue 16; Pages: 5663 |
| Popis: | [EN] The well-known compound tetrakis(tert-butylammonium)-cyclo-tetrametavanadate (V), [(CH3)3CNH3]4[V4O12] (1h_RT), which crystallizes in the tetragonal I4/m space group, undergoes an irreversible solid state transformation upon heating, constituting one of the few examples in which the initial and the final stages are structurally characterized by sc-XRD. Now, we observed the ability of the same compound to undergo an additional single-crystal-to-single-crystal (SCSC) transformation upon thermal stimuli, but this time at low temperatures (153 K). Compound 1h_RT contains a discrete unprotonated [V4O12]4− tetrahedral anion in which V and O bridging atoms are coplanar. In both phases, these tetrameric anions are linked through tert-butylammonium cations in an extensive network of hydrogen bonds, but at low temperatures, this phase loses its characteristic O-V-O coplanarity, with the resulting rearrangement of the crystal packing and hydrogen-bond network which provide its reversibility at low temperatures. Again, the initial and final stages have been characterized structurally by sc-XRD. This research was funded by IT1722-22, KK-2022/00045 and MCIN, grant MAT2017-89553-P. |
| Databáze: | OpenAIRE |
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