Dielectric spectroscopy and molecular dynamics of methylene chloride CH2Cl2

Vij, J. K.; Hufnagel, F.; Grochulski, T.

doi:10.1016/0167-7322(91)80060-h

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…These two spectra are plotted up to 1000 GHz (1 THz) to better define the faster processes centered at frequencies well above the upper limit of the present spectra but which, because of the broadness of DR modes, may still contribute significantly to them. The spectrum for DCM (Figure a) in the region of interest for the present spectra consists of a single Debye process centered at ∼70 GHz, which has been assigned to the rotational diffusion of CH 2 Cl 2 molecules. , For [bmim][BF 4 ] (Figure b), the three processes of relevance at ν ≤ 89 GHz are a Cole−Cole process centered at ∼0.6 GHz, a fast Debye process at ∼80 GHz, and a damped harmonic oscillation at ∼760 GHz . The low-frequency relaxation appears in the DR spectra for all imidazolium-based RTILs and has been ascribed to the reorientation of the dipolar cations .…”

Section: Resultsmentioning

confidence: 81%

From Ionic Liquid to Electrolyte Solution: Dynamics of 1-N-Butyl-3-N-methylimidazolium Tetrafluoroborate/Dichloromethane Mixtures

et al. 2008

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Dielectric spectra have been measured at 25 degrees C for mixtures of the room temperature ionic liquid 1- N-butyl-3- N-methylimidazolium tetrafluoroborate (IL) with dichloromethane (DCM) over the entire composition range at frequencies 0.2 less than or approximately nu/GHz < or = 89. The spectra could be satisfactorily fitted by assuming only two relaxation modes: a Cole-Cole process at lower frequencies and a Debye process at higher frequencies. However, detailed analysis indicated that both spectral features contain additional modes, which could not be resolved due to overlaps. The spectra indicate that the IL appears to retain its chemical character to extraordinarily high levels of dilution ( x IL greater than or approximately 0.5) in DCM. At even higher dilutions ( x IL less than or approximately 0.3), the IL behaves as a conventional but strongly associated electrolyte.

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Section: Resultsmentioning

confidence: 81%

From Ionic Liquid to Electrolyte Solution: Dynamics of 1-N-Butyl-3-N-methylimidazolium Tetrafluoroborate/Dichloromethane Mixtures

et al. 2008

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“…The trend of decreasing yield with higher boiling point solvents in microwave synthesis suggests reduced efficiency. High boiling point solvents consume more energy, leaving less for reactants to overcome energy barriers and form products [67,68] . In contrast, low boiling point solvents efficiently utilize energy for reactant activation.…”

Section: Resultsmentioning

confidence: 99%

“…High boiling point solvents consume more energy, leaving less for reactants to overcome energy barriers and form products. [67,68] In contrast, low boiling point solvents effi- [28,29] b) Frustrated Lewis pair mediated CÀ H borylation. [34] c) Main group catalyzed silylation of N-heterocycles.…”

Section: Resultsmentioning

confidence: 99%

Metal‐Free Directed Site‐Selective Csp³‐H Borylation of Saturated Cyclic Amines

et al. 2023

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The borylation of Csp3‐H bonds is a challenging transformation that is typically restricted to transition metal catalysis. Herein, we report the site‐selective metal‐free Csp3–H borylation of saturated cyclic amines. It is possible to selectively borylate piperidine derivatives at the α or β positions according to the reaction conditions. The mechanism was supported by NMR spectroscopy, calorimetry experiments and density functional theory (DFT) computations. It suggests that the piperidine is dehydrogenated by complexation with BBr3 to produce an enamine intermediate, which is in turn borylated at either the α or β position according to the reaction conditions.

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“…Finally, we simulated the spectrum in the case of excitation by a dipole when the nanowires are in a medium with a refractive index of 1.3, 53 which corresponds to the refractive index of CH 2 Cl 2 in the THz range. We observe a shift of the modes we have attributed to the SPhPs in excellent agreement with the experimentally observed one.…”

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confidence: 99%

Ultrafast Optical Generation of Coherent Bright and Dark Surface Phonon Polaritons in Nanowires

Mante

Lehmann²,

Finkelstein-Shapiro³

et al. 2020

ACS Photonics

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The subwavelength confinement and enhanced electric field created by plasmons allow precise sensing and enhanced light−matter interaction. However, the high frequency and short lifetime of plasmons limit the full potential of this technology. It is crucial to find substitutes and to study their dynamics. Here, we propose an experimental approach allowing the time-domain study of surface phonon polaritons. We first build a theoretical framework for the interaction of ultrashort pulses of light with polar materials. We then perform femtosecond pump− probe experiments and demonstrate the generation and timeresolved detection of surface phonon polaritons. By comparing experiments and simulations, we show the presence of both bright and dark modes with quality factors up to 115. We then investigate mode-dependent decay and energy transfer to the environment. Our results offer a platform for the experimental exploration of the dynamics of surface phonon polaritons and of the role of coherence in energy transfer.

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Dielectric spectroscopy and molecular dynamics of methylene chloride CH2Cl2

Cited by 6 publications

References 12 publications

From Ionic Liquid to Electrolyte Solution: Dynamics of 1-N-Butyl-3-N-methylimidazolium Tetrafluoroborate/Dichloromethane Mixtures

From Ionic Liquid to Electrolyte Solution: Dynamics of 1-N-Butyl-3-N-methylimidazolium Tetrafluoroborate/Dichloromethane Mixtures

Metal‐Free Directed Site‐Selective Csp³‐H Borylation of Saturated Cyclic Amines

Ultrafast Optical Generation of Coherent Bright and Dark Surface Phonon Polaritons in Nanowires

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Dielectric spectroscopy and molecular dynamics of methylene chloride CH2Cl2

Cited by 6 publications

References 12 publications

From Ionic Liquid to Electrolyte Solution: Dynamics of 1-N-Butyl-3-N-methylimidazolium Tetrafluoroborate/Dichloromethane Mixtures

From Ionic Liquid to Electrolyte Solution: Dynamics of 1-N-Butyl-3-N-methylimidazolium Tetrafluoroborate/Dichloromethane Mixtures

Metal‐Free Directed Site‐Selective Csp3‐H Borylation of Saturated Cyclic Amines

Ultrafast Optical Generation of Coherent Bright and Dark Surface Phonon Polaritons in Nanowires

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Metal‐Free Directed Site‐Selective Csp³‐H Borylation of Saturated Cyclic Amines