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Solvent‐Triggered Reversible Phase Changes in Two Manganese‐Based Metal–Organic Frameworks and Associated Sensing Events
Author(s) -
Huang Yike,
Zhang Jun,
Yue Dan,
Cui Yuanjing,
Yang Yu,
Li Bin,
Qian Guodong
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201801821
Subject(s) - phase (matter) , phase diagram , manganese , materials science , metal organic framework , quenching (fluorescence) , aqueous solution , solvent , metal , decomposition , chemistry , fluorescence , physics , organic chemistry , adsorption , quantum mechanics , metallurgy
A flexible Mn‐based MOF, Mn‐sdc‐1, has been successfully synthesized by using the ligand 4,4′‐stilbenedicarboxylic acid (H 2 sdc). Attributed to the flexibility of the framework, Mn‐sdc‐1 can transform into a new phase (Mn‐sdc‐2) with completely different structural geometry; this is induced by trace levels of H 2 O at room temperature. Reversibly, the transformation from Mn‐sdc‐2 to Mn‐sdc‐1 can be triggered by DMF upon heating beyond 100 °C. These results inspired a study of the influences of temperature and H 2 O volume in the solid‐state transformation of two MOF phases and, for the first time, a phase diagram of MOFs has been depicted. This phase diagram reflects the gradual H 2 O‐/temperature‐dependent changes between Mn‐sdc‐1 and Mn‐sdc‐2, which is very meaningful in achieving the controllable synthesis of these two MOFs and lead to targeting the desired water‐stable structure. As a result, the obtained water‐stable Mn‐sdc‐2 can be developed as an excellent Pb 2+ sensor in aqueous solution through the luminescence quenching effect with a limit of detection of 31.4 n m .