FTIR spectral study of intermolecular interactions of C=O groups of amides in solution

Rakipov, Ilnaz T.; Petrov, Аrtem А.; Akhmadiyarov, Aydar A.; Khachatrian, Artashes A.; Varfolomeev, Mikhail A.

doi:10.1016/j.molliq.2022.118838

“…Frequencies of the stretching vibrations of C=O groups of alanine anhydride and sarcosine anhydride in solvents are presented in Table 1 . The S VW parameter of solvents was taken from [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

“…It was found that there is a linear dependence between N-H and methyl-substituted anhydride in aprotic solvents ( Figure 3 ). Previously, when we compared the absorption frequencies of the C=O groups of N -methyl with those of N,N -dimethyl-substituted amides, no linear dependence was observed [ 16 ]. This was realized through the formation of hydrogen bonds of amides with proton acceptors of the N-H∙∙∙B type.…”

Section: Resultsmentioning

confidence: 99%

“…In this case, studies on associated solvents, including water, are of particular interest. Earlier, our group actively studied the intermolecular interactions of structural fragments of dipeptides and proteins (linear and cyclic amides) [ 12 , 13 , 14 , 15 , 16 ]. The effect of the number of active proton donor centers of linear amides on their proton donor properties in solution was shown [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…The stability of these systems is determined by the cooperativity of hydrogen bonds [ 20 , 21 , 22 ]. We studied the cooperative effects of amides with organic molecules by infrared spectroscopy [ 16 ]. The effect of solvent properties on the stretching vibrations of the C=O groups of the amides was studied [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…We studied the cooperative effects of amides with organic molecules by infrared spectroscopy [ 16 ]. The effect of solvent properties on the stretching vibrations of the C=O groups of the amides was studied [ 16 ]. A method for the evaluation of cooperative effects in multi-particle amide complexes in self-associated solvents was proposed.…”

Section: Introductionmentioning

confidence: 99%

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The paper reports the results of investigation intermolecular interactions between alanine and sarcosine anhydride in organic solvents. The absorption frequencies of cyclic dipeptide in solvents were measured by IR spectroscopy. The effect of Van der Waals interactions and the hydrogen bonding of solvents on absorption frequencies of the C=O group of anhydrides was discussed. The spectroscopic parameters for C=O∙∙∙H-O hydrogen bonding complexes of anhydride with methanol in aprotic and proton donor solvent are obtained. In multi-particle complexes of dipeptides with aliphatic alcohols, the hydrogen bond enhancement was between 10 and 16%, which is significantly lower than it is for amide complexes.

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Electrolytes that can keep liquid state are one of the most important physical metrics to ensure the ions transfer with stable operation of rechargeable lithium‐based batteries at a wide temperature window. It is generally accepted that strong polar solvents with high melting points favor the safe operation of batteries above room temperatures but are susceptible to crystallization at low temperatures (≤−40 °C). Here, a crystallization limitation strategy was proposed to handle this issue. We demonstrate that, although the high melting points of ethylene sulfite (ES, −17 °C) and fluoroethylene carbonate (FEC, ≈23 °C), their mixtures can avoid crystallization at low temperatures, which can be attributed to low intermolecular interactions and altered molecular motion dynamics. A suitable ES/FEC ratio (10 % FEC) can balance the bulk and interface transport of ions, enabling LiNi0.8Mn0.1Co0.1O2||lithium (NCM811||Li) full cells to deliver excellent temperature resilience and cycling stability over a wide temperature range from −50 °C to +70 °C. More than 66 % of the capacity retention was achieved at −50 °C compared to room temperature. The NCM811||Li pouch cells exhibit high cycling stability under realistic conditions (electrolyte weight to cathode capacity ratio (E/C)≤3.5 g Ah−1, negative to positive electrode capacity ratio (N/P)≤1.09) at different temperatures.

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FTIR spectral study of intermolecular interactions of C=O groups of amides in solution

Cited by 11 publications

References 35 publications

The Solvation Effect of C=O Group of Cyclic Anhydrides in Solution

The Solvation Effect of C=O Group of Cyclic Anhydrides in Solution

Asymmetric Solvents Regulated Crystallization‐Limited Electrolytes for All‐Climate Lithium Metal Batteries

Asymmetric Solvents Regulated Crystallization‐Limited Electrolytes for All‐Climate Lithium Metal Batteries

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