Thermal and spectroscopic investigations on three phosphonium based ionic liquids for industrial and biological applications

Thasneema, K K; Thayyil, Mohamed Shahin; Rosalin, Tancia; Elyas, K. K.; Dipin, T.; Sahu, Pramod K.; Kumar, N.S. Krishna; Saheer, V. C.; Messali, Mouslim; Hadda, Taïbi Ben

doi:10.1016/j.molliq.2020.112960

Cited by 16 publications

(2 citation statements)

References 39 publications

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“…Therefore, the temperature at which the sample begins to decompose is lower than Tonset. Tz (decomposition degree z) is also a parameter to characterize the short-term thermal stability, which directly shows the temperatures at different decomposition degrees [55,63,[67][68][69]. Both parameters are illustrated clearly in Figure 1.…”

Section: Short-term Thermal Stabilitymentioning

confidence: 99%

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Cheng

2021

Processes

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Ionic liquids (ILs) are the safest solvent in various high-temperature applications due to their non-flammable properties. In order to obtain their thermal stability properties, thermogravimetric analysis (TGA) is extensively used to analyze the kinetics of the thermal decomposition process. This review summarizes the different kinetics analysis methods and finds the isoconversional methods are superior to the Arrhenius methods in calculating the activation energy, and two tools—the compensation effect and master plots—are suggested for the calculation of the pre-exponential factor. With both parameters, the maximum operating temperature (MOT) can be calculated to predict the thermal stability in long-term runnings. The collection of thermal stability data of ILs with divergent cations and anions shows the structure of cations such as alkyl side chains, functional groups, and alkyl substituents will affect the thermal stability, but their influence is less than that of anions. To develop ILs with superior thermal stability, dicationic ILs (DILs) are recommended, and typically, [C4(MIM)2][NTf2]2 has a decomposition temperature as high as 468.1 °C. For the convenience of application, thermal stability on the decomposition temperature and thermal decomposition activation energy of 130 ILs are summarized at the end of this manuscript.

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Section: Short-term Thermal Stabilitymentioning

confidence: 99%

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Cheng

2021

Processes

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“…Another study showed that tri- n -hexyl( n -tetradecyl)phosphonium salts that were coupled with various anions met all the requirements of new compounds for pharmaceutical use. Their antibacterial, anticancer and antioxidant activities were also demonstrated [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Sterically Hindered Quaternary Phosphonium Salts (QPSs): Antimicrobial Activity and Hemolytic and Cytotoxic Properties

Ermolaev

Arkhipova

Miluykov

et al. 2021

IJMS

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Structure–activity relationships are important for the design of biocides and sanitizers. During the spread of resistant strains of pathogenic microbes, insights into the correlation between structure and activity become especially significant. The most commonly used biocides are nitrogen-containing compounds; the phosphorus-containing ones have been studied to a lesser extent. In the present study, a broad range of sterically hindered quaternary phosphonium salts (QPSs) based on tri-tert-butylphosphine was tested for their activity against Gram-positive (Staphylococcus aureus, Bacillus сereus, Enterococcus faecalis) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) bacteria and fungi (Candida albicans, Trichophyton mentagrophytes var. gypseum). The cation structure was confirmed to determine their biological activity. A number of QPSs not only exhibit high activity against both Gram-positive and -negative bacteria but also possess antifungal properties. Additionally, the hemolytic and cytotoxic properties of QPSs were determined using blood and a normal liver cell line, respectively. The results show that tri-tert-butyl(n-dodecyl)phosphonium and tri-tert-butyl(n-tridecyl)phosphonium bromides exhibit both low cytotoxicity against normal human cells and high antimicrobial activity against bacteria, including methicillin-resistant strains S. aureus (MRSA). The mechanism of QPS action on microbes is discussed. Due to their high selectivity for pathogens, sterically hindered QPSs could serve as effective tunable biocides.

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Dicationic Imizadolium‐Based Tetrafluoroborate Ionic Liquids: Synthesis and Hydrothermal Stability Study

Cheng

2022

ChemistrySelect

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Six novel dicationic imizadolium‐based tetrafluoroborate ionic liquids were synthesized, with four of which contained hydroxyl groups. Their chemical structures were identified by FTIR and 1H NMR, and their onset decomposition temperatures (Tonset) were measured by thermogravimetric analysis (TGA). For investigating the hydrothermal stability, all DILs were mixed with water and heated for 1, 5, and 9 hours to 240 °C in an airtight kettle.The results show that DILs with hydroxyls have a higher Tonset but they exhibit evident changes in chemical structures after heating with water for 9 hours. The conflicts between Tonset and long‐term stability tests is ascribed to the reason that water forms new hydrogen bonds with hydroxyls and therefore weakens the intramolecular interaction between the cation and anion.

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Thermal and spectroscopic investigations on three phosphonium based ionic liquids for industrial and biological applications

Cited by 16 publications

References 39 publications

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Sterically Hindered Quaternary Phosphonium Salts (QPSs): Antimicrobial Activity and Hemolytic and Cytotoxic Properties

Dicationic Imizadolium‐Based Tetrafluoroborate Ionic Liquids: Synthesis and Hydrothermal Stability Study

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