Portal de Periódicos da CAPES

Theoretical Prediction and Experimental Evaluation of Topological Landscape and Thermodynamic Stability of a Fluorinated Zeolitic Imidazolate Framework

2019; American Chemical Society; Volume: 31; Issue: 10 Linguagem: Inglês

10.1021/acs.chemmater.9b00994

1520-5002

Mihails Arhangelskis, Athanassios D. Katsenis, Novendra Novendra, Zamirbek Akimbekov, Gandrath Dayaker, Joseph M. Marrett, Ghada Ayoub, Andrew J. Morris, Omar K. Farha, Tomislav Friščić, Alexandra Navrotsky,

Nanoplatforms for cancer theranostics

The prediction of topological preferences and polymorph stability remains a challenge for the design of metal–organic frameworks exhibiting a rich topological landscape, such as zeolitic imidazolate frameworks (ZIFs). Here, we have used mechanochemical screening and calorimetry to test the ability of dispersion-corrected periodic density functional theory (DFT) to accurately survey the topological landscape, as well as quantitatively evaluate polymorph stability, for a previously not synthesized ZIF composition. Theoretical calculations were used to obtain an energy ranking and evaluate energy differences for a set of hypothetical, topologically distinct structures of a fluorine-substituted ZIF. Calculations were then experimentally validated via mechanochemical screening and calorimetry, which confirmed two out of three theoretically anticipated topologies, including a fluorinated analogue of the popular ZIF-8, while revealing an excellent match between the measured and theoretically calculated energetic differences between them. The results, which speak strongly in favor of the ability of dispersion-corrected periodic DFT to predict the topological landscape of new ZIFs, also reveal the ability to use peripheral substituents on the organic linker to modify the framework thermodynamic stability.