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2015 ; 5
(ä): 10619
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Properties of water confined in ionic liquids
#MMPMID26024339
Saihara K
; Yoshimura Y
; Ohta S
; Shimizu A
Sci Rep
2015[May]; 5
(ä): 10619
PMID26024339
show ga
The varying states of water confined in the nano-domain structures of typical
room temperature ionic liquids (ILs) were investigated by (1)H NMR and by
measurements of self-diffusion coefficients while systematically varying the IL
cations and anions. The NMR peaks for water in BF4-based ILs were clearly split,
indicating the presence of two discrete states of confined water (H2O and HOD).
Proton and/or deuterium exchange rate among the water molecules was very slowly
in the water-pocket. Notably, no significant changes were observed in the
chemical shifts of the ILs. Self-diffusion coefficient results showed that water
molecules exhibit a similar degree of mobility, although their diffusion rate is
one order of magnitude faster than that of the IL cations and anions. These
findings provide information on a completely new type of confinement, that of
liquid water in soft matter.
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