Solvent-induced single crystal to single crystal transformation and 'turn-on' fluorescence based on a dynamic 3D metal-organic framework

摘要

A dynamic three-dimension (3D) metal-organic framework, namely JUC-199[Zn-4(TBCB)(H2O)(6)]center dot 5DMAc, was designed and synthesized under the solvothermal condition. The resultant crystal was successfully constructed by an organic ligand 2,2',6,6'-Tetralds[3,5-bis-3,5-benzenedicarboxylate] benzidine (H8TBCB) and [Zn-2(COO)(4)] inorganic clusters. Interesting, the single crystal X-ray diffraction illustrated that JUC-199 could entirely transform into JUC-199a only in ethylene glycol monomethylether (EGME) after two days, which possessed obviously different lattice parameters. In addition, JUC-199a exhibits an obviously yellow fluorescence, whereas JUC-199 doesn't show any fluorescence property. Furthermore, the obtained samples were characterized in detail. (C) 2017 Published by Elsevier B.V.