Investigation of the ion-molecular interactions in dimethylformamide medium by the method of infrared spectroscopy

Perelygin, I. S.; Osipov, V. S.

doi:10.1007/bf00665304

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…The experimental setup for intensity-modulated photocurrent and photovoltage spectroscopy (IMPS and IMVS) measurements has been described elsewhere. [27][28][29] Intensity-modulated measurements were carried out by using an electrochemical workstation (IM6e, Zahner, Germany) with light emitting diodes (l ¼ 610 nm) driven by export (Zahner, Germany). Electrochemical impedance spectroscopy (EIS) measurements were performed on an electrochemical workstation (Autolab 320, Metrohm, Switzerland), at a perturbation amplitude of 10 mV within the frequency range from 1 MHz to 10 mHz in the dark.…”

Section: Imvs/imps and Electrochemical Impedance Measurementsmentioning

confidence: 99%

Gel electrolyte materials formed from a series of novel low molecular mass organogelators for stable quasi-solid-state dye-sensitized solar cells

Huo

Ding

et al. 2014

J. Mater. Chem. A

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Electrolyte materials are the key components in dye-sensitized solar cells (DSCs) and are very crucial to the performance and long-term stability of DSCs. We developed a series of diamide derivatives as novel low molecular mass organogelators (LMOGs) for DSCs. These LMOGs contain different numbers (2, 6, 5 and 9) of methylene groups (-CH 2 -) between the two amide carbonyl groups and exhibit distinctive selfassembly behaviors. The gel electrolytes prepared by these LMOGs possess high gel-to-solution transition temperatures (over 100 C) and the stability of DSCs is largely enhanced. More importantly, the parity of the number of -CH 2and their special molecular arrangements have a remarkable influence on the self-assembly of the gelators resulting in a significantly different morphology, and further influence the photovoltaic performances of DSCs. It is found that the LMOGs containing odd-numbered -CH 2lead to a much better charge transport of the gel electrolytes, inducing a longer electron lifetime and higher incident photon-to-electron conversion efficiency compared with the LMOGs containing even-numbered -CH 2 -. Finally, a superior quasi-solid-state DSC based on the gelator containing five -CH 2is obtained, which exhibits a photoelectric conversion efficiency of 7.53% and excellent thermal and light-soaking stabilities during accelerated aging tests.

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Section: Imvs/imps and Electrochemical Impedance Measurementsmentioning

confidence: 99%

Gel electrolyte materials formed from a series of novel low molecular mass organogelators for stable quasi-solid-state dye-sensitized solar cells

Huo

Ding

et al. 2014

J. Mater. Chem. A

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“…For example, the ν(CO) region is frequently utilized for identification of the secondary structure of proteins. − Furthermore, this band has been also employed for assessing the polymer–solvent interactions. − In 1968, Chalapathi and Ramiah were the first to assign the infrared and Raman frequencies of two typical amides: N , N -dimethylformamide (DMF) and DMAc. Later, multiple research groups performed more detailed investigations of the ν(CO) region of DMF, DMAc, and other amides such as formamide and N -methylformamide, contributing significantly to our understanding of this band composition. − In these studies, authors mainly employed theoretical methods and Raman spectroscopy while infrared (IR) spectroscopy was used less frequently. Importantly, the assignment of Raman bands was extended also to the IR bands.…”

Section: Introductionmentioning

confidence: 99%

Intermolecular Interactions in N,N-Dimethylacetamide without and with LiCl Studied by Infrared Spectroscopy and Quantum Chemical Model Calculations

2018

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The mixture of LiCl and N, N-dimethylacetamide (DMAc) is an important laboratory-scale solvent for cellulose. However, the mechanism of cellulose dissolution in DMAc/LiCl could not be fully established due to the limited knowledge about the interactions between DMAc and LiCl. To address this issue, we studied neat DMAc and DMAc/LiCl mixtures by ATR FTIR spectroscopy and quantum chemical model calculations. On the basis of the calculations, we newly assigned the bands at 1660 and 1642 cm in the ν(C═O) region of the spectra to DMAc monomeric and dimeric structures. The latter are presumably stabilized by the C-H···O═C weak hydrogen bonds that prevail in both neat DMAc and DMAc/LiCl mixtures. The analysis of the concentrated (7.9 wt % of LiCl) DMAc/LiCl mixture revealed that only about half of DMAc molecules interact directly with LiCl. The resulting average stoichiometry of about 2.8:1 (DMAc:LiCl), indicating the predominance of [(DMAc)-LiCl] and [(DMAc)-LiCl] complexes, was found to be temperature independent. Conversely, the stoichiometry was considerably temperature sensitive for the diluted DMAc/LiCl mixture (2.6 wt % of LiCl), indicating that further DMAc molecules can be incorporated into the primary solvation shell of LiCl at higher temperatures. These results highlight the dynamic character of the DMAc/LiCl system that needs to be considered when studying the cellulose dissolution mechanism.

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Li+-molecule interactions of lithium tetrafluoroborate in propylene carbonate + N,N-dimethylformamide mixtures: An FTIR spectroscopic study

Zhang

Yuan

et al. 2014

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Investigation of the ion-molecular interactions in dimethylformamide medium by the method of infrared spectroscopy

Cited by 3 publications

References 13 publications

Gel electrolyte materials formed from a series of novel low molecular mass organogelators for stable quasi-solid-state dye-sensitized solar cells

Gel electrolyte materials formed from a series of novel low molecular mass organogelators for stable quasi-solid-state dye-sensitized solar cells

Intermolecular Interactions in N,N-Dimethylacetamide without and with LiCl Studied by Infrared Spectroscopy and Quantum Chemical Model Calculations

Li+-molecule interactions of lithium tetrafluoroborate in propylene carbonate + N,N-dimethylformamide mixtures: An FTIR spectroscopic study

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