%0 Generic
%A Zhu, Wen-Hua
%A Wang, Zhe-Ming
%A Gao, Song
%D 2007
%T Two 3D Porous Lanthanide−Fumarate−Oxalate Frameworks Exhibiting
Framework Dynamics and Luminescent Change upon Reversible De-
and Rehydration
%U https://acs.figshare.com/articles/dataset/Two_3D_Porous_Lanthanide_Fumarate_Oxalate_Frameworks_Exhibiting_Framework_Dynamics_and_Luminescent_Change_upon_Reversible_De_and_Rehydration/3025666
%R 10.1021/ic061833e.s002
%2 https://acs.figshare.com/ndownloader/files/4728022
%K rehydration
%K Reversible De
%K Luminescent Change
%K materials degrades
%K lanthanide ion
%K exhibit framework dynamics
%K guest water
%K spectroscopic data
%K 3 D framework structure
%K Framework
%K dehydration process
%K water molecules
%K hydrothermal method
%K phase
%K luminescence
%K intersected channels
%K Ln ion
%X We present two porous luminescent compounds, [Ln2(fumarate)2(oxalate)(H2O)4]·4H2O (Ln = Eu, Tb), prepared by
the hydrothermal method. The materials have 3D framework structure consisting of oxalate pillared lanthanide−fumarate layers with intersected channels occupied by guest water. They exhibit framework dynamics upon several
cycles of dehydration and rehydration. The crystallinity of the as-prepared hydrated materials degrades completely
to the amorphous dehydrated phases, while it returns upon rehydration. A mechanism for de-/rehydration is proposed
on the basis of the structure and spectroscopic data. The dehydration process is accompanied by the lost of
luminescence of Ln ion, but the luminescence is recovered upon rehydration, where water molecules in fact enhance
the luminescence but not quench it. This is probably due to the softened environment of lanthanide ion in the
dehydrated amorphous phases and the recovery of the stiffness after rehydration.
%I ACS Publications