The effect of lithium triflate and lithium bromide on the vibrational frequencies of DMEDA

York, Shawna S.; Boesch, Scott E.; Wheeler, Ralph A.; Frech, Roger

doi:10.1039/b204103k

Cited by 14 publications

(29 citation statements)

References 41 publications

(117 reference statements)

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“…The FTIR spectrum of particle 4 showed a sharp band at 3270 cm À1 from the crystalline phase of linear PEI. [17] Calcein was loaded as a guest molecule into the pore of a silica particle by soaking particle 4 in a phosphate-buffered saline (PBS) solution (pH 7.4) of calcein. Then, a-CD was added into the mixture to provide calcein-loaded a-CD/4 in which the pore was blocked by PEI/a-CD polypseudorotaxane.…”

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confidence: 99%

Controlled Release of Guest Molecules from Mesoporous Silica Particles Based on a pH‐Responsive Polypseudorotaxane Motif

et al. 2007

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confidence: 99%

Controlled Release of Guest Molecules from Mesoporous Silica Particles Based on a pH‐Responsive Polypseudorotaxane Motif

et al. 2007

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“…The exact frequency of the ν s (SO 3 ) mode is slightly dependent on the choice of counter ion and solvent system. In the context of the associated-ion model, the 1029 cm −1 band is consistent with the presence of "free" triflate anions in a system where the oxygen atoms undergo hydrogen bonding interactions, 19,20 whereas the 1036 cm −1 band may be attributed to either ion-paired or more highly aggregated moieties in the ionic liquid. However, the strong monopole-monopole interactions that exist among the constituent ions composing the molten salt make it difficult to unambiguously assign the bands to specific entities.…”

Section: B the Associated-ion Modelmentioning

confidence: 61%

Existence of optical phonons in the room temperature ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate

Burba

Frech

2011

The Journal of Chemical Physics

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The technologically important properties of room temperature ionic liquids (RTILs) are fundamentally linked to the ion-ion interactions present among the constituent ions. These ion-ion interactions in one RTIL (1-ethyl-3-methylimidazolium trifluoromethanesulfonate, [C(2)mim]CF(3)SO(3)) are characterized with transmission FTIR spectroscopy and polarized attenuated total reflection (ATR) FTIR spectroscopy. A quasilattice model is determined to be the best framework for understanding the ionic interactions. A novel spectroscopic approach is proposed to characterize the degree of order that is present in the quasilattice by comparing the dipole moment derivative calculated from two independent spectroscopic measurements: (1) the TO-LO splitting of a vibrational mode using dipolar coupling theory and (2) the optical constants of the material derived from polarized ATR experiments. In principle, dipole moment derivatives calculated from dipolar coupling theory should be similar to those calculated from the optical constants if the quasilattice of the RTIL is highly structured. However, a significant disparity for the two calculations is noted for [C(2)mim]CF(3)SO(3), indicating that the quasilattice of [C(2)mim]CF(3)SO(3) is somewhat disorganized. The potential ability to spectroscopically characterize the structure of the quasilattice, which governs the long-range ion-ion interactions in a RTIL, is a major step forward in understanding the interrelationship between the molecular-level interactions among the constituent ions of an ionic liquid and the important physical properties of the RTIL.

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“…7 shows changes in the PPI modes as a function of salt concentration at room temperature and 70°C from 650 to 1000 cm − 1 . This spectral region contains C-N stretching modes, C-C stretching modes, and is sensitive to the conformation of the backbone [18][19][20]. This region also contains several triflate anion vibrations that are discussed in the following section.…”

Section: -1150 CM − 1 Spectral Regionmentioning

confidence: 96%

“…These assignments are inferred from extensive vibrational spectroscopic studies of PEI and its oligomers [9,[18][19][20]. When pure PEI is heated to 70°C, the sharp bands at 1246, 1281 and 1330 cm − 1 become weak and very broad.…”

Section: -1150 CM − 1 Spectral Regionmentioning

confidence: 98%

Linear poly(propylenimine)/lithium triflate as a polymer electrolyte system

Hu¹,

Frech²,

Glatzhofer³

et al. 2008

Solid State Ionics

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The effect of lithium triflate and lithium bromide on the vibrational frequencies of DMEDA

Cited by 14 publications

References 41 publications

Controlled Release of Guest Molecules from Mesoporous Silica Particles Based on a pH‐Responsive Polypseudorotaxane Motif

Controlled Release of Guest Molecules from Mesoporous Silica Particles Based on a pH‐Responsive Polypseudorotaxane Motif

Existence of optical phonons in the room temperature ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate

Linear poly(propylenimine)/lithium triflate as a polymer electrolyte system

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