Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 53, Pages 12985-12990Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201702405
Keywords
coordination polymers; dynamic crystals; mechanism; structural transformations; substituent effects
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Funding
- National Natural Science Foundation of China [21541002]
- Tianjin Natural Science Foundation [17JCYBJC22800]
- Innovation Foundation of Tianjin Normal University [52XC1402]
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Currently, no unequivocal evidence is given for elucidation of black box during the structural transformations of dynamic crystalline materials. Here, three types of mechanisms are revealed for such transformations through X-ray diffraction and optical microscopy; namely, single-crystal to single-crystal (SC-SC), as well as core-to-core and core-on-shell processes. As confirmed by time-lapse optical microscopy, the latter two cases can be properly ascribed as partial recrystallization processes, while the former one is a continuous process with two different crystal lattices simultaneously maintained in one single crystal. Interestingly, these three distinct pathways can be exquisitely realized by changing only the halogen substituent (from -F, -Cl, to -Br) of the organic ligands in the coordination supramolecular systems.
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