Nanostructural organization and anion effects on the temperature dependence of the Optical Kerr effect spectra of ionic liquids

Article Abstract:

Optical heterodyne-detected Raman-induced Kerr effect spectroscopy is carried out to analyze the temperature dependence of intermolecular spectra of three imidazolium ionic liquids, including , 1,3-pentylmethylimidazolium cation ([[[C.sub.5]mim].sup.+]), and the anions , bromide ([Br.sup.-]) , hexafluorophosphate (P[F.sub.6.sup.-]), and bis(trifluoromethanesulfony)imide (N[Tf.sub.2.sup.-]). It is demonstrated that the room-temperature ionic liquids (RTILs) are nanostructurally organized with nonpolar regions developing from clustering of the alkyl chains and ionic networks emerging from charge ordering of the anions and imidazolium rings of the cations and the distinction in the temperature dependences of the OKE spectra are simplified on the basis of the degree of charge ordering in the polar regions of the RTILs.

Spectra, Ionic solutions, Raman spectroscopy

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Additivity in the optical Kerr effect spectra of binary ionic liquid mixtures: Implications for nanostructures organization

Article Abstract:

The low-frequency spectra of binary room-temperature ionic liquid (RTIL) mixtures of 1-pentyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide and 1-pentyl-3-methylimidazolium bromide is studied as a function of mole fraction at 295 K. The spectra is obtained by using the optical heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES) and these 'block co-networks' would have a nanostructural organization resembling that of a block copolymer.

Raman effect, Block copolymers

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Theoretical assessment of naphazoline redochemistry and photochemistry

Article Abstract:

Computational electronic tools are used to study the redox properties, photochemical behavior and electronic features of the imidazoline derivative naphazoline (NP) (2-(1-naphthylmethyl)-2-imidazoline). The difference in photochemical behavior between the protonated and unprotonated species has allowed for an efficient quenching in the basic structure but clear naphthalene to imidazolene charge transfer upon HOMO to LUMO excitation in the protonated form.

Pharmaceutical Preparation Manufacturing, Pharmaceutical preparations, Ethical Cold Preparations, Photochemical research, Chemical properties, Naphazoline

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