Title:
Unravelling the mechanism of water sensing by the Mg2+
dihydroxy-terephthalate MOF (AEMOF-1 ‘)
Languages of Item:
English
Abstract:
In this contribution we build upon our previous work on the MOF
[Mg(H(2)dhtp)(H2O)(2)]center dot DMAc (AEMOF-1 center dot DMAc) and
its activated dry version AEMOF-1 ‘ which has been shown to exhibit
excellent luminescence sensing properties towards water in organic
solvents. We demonstrate through combined structural and photophysical
studies that the observed changes in the fluorescence properties of
AEMOF-1 ‘ upon hydration arise from a structural transformation to the
mononuclear complex [Mg(H(2)dhtp)(H2O)(5)]center dot H2O (H(4)dhtp =
2,5-dihydroxyterepthalic acid) (1). In the latter complex, excited state
intramolecular proton transfer (ESIPT) is strongly favoured thereby
leading to enhanced and red shifted emission in comparison to AEMOF-1
center dot DMAc. Powder X-ray diffraction measurements confirmed that
complex 1 is identical to the hydrated form of AEMOF-1 center dot DMAc.
As in the case of AEMOF-1 ‘, the dry form of complex 1 (1 ‘) is also an
effective sensor for the determination of traces of water in
tetrahydrofuran (THF). This work demonstrates that the same chromophore
may exhibit very different emission properties when it exists in
different chemical environments and that these transformations may be
controlled and utilized in water sensing applications.
Authors:
Eleutheria Papazoi
Antigoni Douvali
Stavros A. Diamantis
Giannis S. Papaefstathiou
Svetlana V. Eliseeva
Stéphane Petoud
Antonios G. Hatzidimitriou
Theodore Lazarides
Manolis J. Manos
Journal:
Molecular Systems Design & Engineering
Publisher:
Royal Society of Chemistry (RSC)
Main subject category:
Science
Official URL (Publisher):
