Understanding the extraction and complexation of thorium using structurally modified CMPO functionalized pillar[5]arenes in ionic liquid: Experimental and theoretical investigations

Sengupta, Arijit; Singh, Manpreet; Sundarajan, Mahesh; Yuan, Lihua; Fang, Yuyu; Yuan, Xianglei; Feng, Wen

doi:10.1016/j.inoche.2016.11.025

Cited by 20 publications

(2 citation statements)

References 69 publications

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“…As the NO 3 − concentration increases, there is no inflection point in the change in Th(IV) adsorption amount by SG-CTSQ 4 , indicating that the adsorption process is influenced by the variation in H + concentration. According to the complexation behavior of Th(IV), it can form complex anions [Th(NO 3 ) 6 ] 2− and [Th(NO 3 ) 5 ] − with NO 3 − , thus, being adsorbed through anion exchange [42]. In this process, the higher the NO 3 − concentration, the greater the proportion of complex anions, making it easier to be adsorbed; however, when the acidity of the system increases, H + also participates in complexation to a certain extent, forming particles such as H 2 Th(NO 3 ) 6 that cannot participate in anion-exchange reactions [10].…”

Section: Study On the Adsorption And Separation Properties Of Th(iv) ...mentioning

confidence: 99%

Preparation of Quaternary Ammonium Separation Material based on Coupling Agent Chloromethyl Trimethoxysilane (KH-150) and Its Adsorption and Separation Properties in Studies of Th(IV)

Wang,

Wu,

Liu

et al. 2024

Molecules

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In this research, the authors studied the synthesis of a silicon-based quaternary ammonium material based on the coupling agent chloromethyl trimethoxysilane (KH-150) as well as its adsorption and separation properties for Th(IV). Using FTIR and NMR methods, the silicon-based materials before and after grafting were characterized to determine the spatial structure of functional groups in the silicon-based quaternary ammonium material SG-CTSQ. Based on this, the functional group grafting amount (0.537 mmol·g−1) and quaternization rate (83.6%) of the material were accurately calculated using TGA weight loss and XPS. In the adsorption experiment, the four materials with different grafting amounts showed different degrees of variation in their adsorption of Th(IV) with changes in HNO3 concentration and NO3− concentration but all exhibited a tendency toward anion exchange. The thermodynamic and kinetic experimental results demonstrated that materials with low grafting amounts (SG-CTSQ1 and SG-CTSQ2) tended to physical adsorption of Th(IV), while the other two tended toward chemical adsorption. The adsorption mechanism experiment further proved that the functional groups achieve the adsorption of Th(IV) through an anion-exchange reaction. Chromatographic column separation experiments showed that SG-CTSQ has a good performance in U-Th separation, with a decontamination factor for uranium in Th(IV) of up to 385.1, and a uranium removal rate that can reach 99.75%.

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Section: Study On the Adsorption And Separation Properties Of Th(iv) ...mentioning

confidence: 99%

Preparation of Quaternary Ammonium Separation Material based on Coupling Agent Chloromethyl Trimethoxysilane (KH-150) and Its Adsorption and Separation Properties in Studies of Th(IV)

Wang,

Wu,

Liu

et al. 2024

Molecules

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“…The results obtained unambiguously indicate the formation of the 7/5-VT complex. The absence of cross peaks between 5-VT and aromatic protons of pillar [5]arene 7 indicates that the monomer is not in the macrocyclic cavity but in the pseudocavity of the macrocycle formed by fragments of substituents [62][63][64].…”

Section: Study Of the Interaction Of Pillar[5]arenes With Pvt And Pvte Polymersmentioning

confidence: 99%

Towards Universal Stimuli-Responsive Drug Delivery Systems: Pillar[5]arenes Synthesis and Self-Assembly into Nanocontainers with Tetrazole Polymers

et al. 2021

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In this work, we have proposed a novel universal stimulus-sensitive nanosized polymer system based on decasubstituted macrocyclic structures—pillar[5]arenes and tetrazole-containing polymers. Decasubstituted pillar[5]arenes containing a large, good leaving tosylate, and phthalimide groups were first synthesized and characterized. Pillar[5]arenes containing primary and tertiary amino groups, capable of interacting with tetrazole-containing polymers, were obtained with high yield by removing the tosylate and phthalimide protection. According to the fluorescence spectroscopy data, a dramatic fluorescence enhancement in the pillar[5]arene/fluorescein/polymer system was observed with decreasing pH from neutral (pH = 7) to acidic (pH = 5). This indicates the destruction of associates and the release of the dye at a pH close to 5. The presented results open a broad range of opportunities for the development of new universal stimulus-sensitive drug delivery systems containing macrocycles and nontoxic tetrazole-based polymers.

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Computational Unravelling of the Role of Alkyl Groups on the Host‐Guest Complexation of Pillar[5]arenes with Neutral Dihalobutanes

et al. 2018

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Density Functional Theory (DFT) calculations have been carried out to understand the electronic structure and non-covalent interactions within host-guest complexes between 1,4-dihalobutanes (DHBs) and alkylated pillar[5]arenes (P5 A). Binding energies show that the propyl substituted P5 A are found to have greater binding abilities than that of P5 A with smaller alkyl chains. Among the halogens, dibromobutane is found to have higher binding energy compared to difluoro and dichloro butanes respectively. Contribution of different molecular units towards the frontier molecular orbitals has been studied to gain insights into the role of each segment at the molecular level. Electrostatic potential maps are examined to draw clues on the nature of active sites for the inclusion phenomena. Non-covalent interactions (NCI) present in these host-guest complexes are addressed from NCI analysis based reduced density gradient method. In order to characterize these weak interactions, Bader's Quantum Theory of Atoms In Molecules (QTAIM) analysis is utilized. Our results reveal that though the hydrogen bonding patterns in P5 A inclusion complexes are collapsed upon alkylation, a new set of X-HÀC interactions stabilize these DHBs along with other CÀH-p interactions in the alkylated P5 A inclusion complexes. Overall, the present study sheds light on the importance of the alkyl chain and handling non-covalent interactions carefully to tune the binding ability of P5 A.

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Understanding the extraction and complexation of thorium using structurally modified CMPO functionalized pillar[5]arenes in ionic liquid: Experimental and theoretical investigations

Cited by 20 publications

References 69 publications

Preparation of Quaternary Ammonium Separation Material based on Coupling Agent Chloromethyl Trimethoxysilane (KH-150) and Its Adsorption and Separation Properties in Studies of Th(IV)

Preparation of Quaternary Ammonium Separation Material based on Coupling Agent Chloromethyl Trimethoxysilane (KH-150) and Its Adsorption and Separation Properties in Studies of Th(IV)

Towards Universal Stimuli-Responsive Drug Delivery Systems: Pillar[5]arenes Synthesis and Self-Assembly into Nanocontainers with Tetrazole Polymers

Computational Unravelling of the Role of Alkyl Groups on the Host‐Guest Complexation of Pillar[5]arenes with Neutral Dihalobutanes

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