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Journal articles on the topic 'Ion-pair complex'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Fang, Yao-Ren, and Kenneth Charles Westaway. "Isotope effects in nucleophilic substitution reactions. VIII. The effect of the form of the reacting nucleophile on the transition state structure of an SN2 reaction." Canadian Journal of Chemistry 69, no. 6 (1991): 1017–21. http://dx.doi.org/10.1139/v91-149.

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A spectroscopic investigation indicated that lithium thiophenoxide exists as a contact ion pair complex in dry diglyme whereas the other alkali metal thiophenoxides exist as a solvent-separated ion pair complex in diglyme. The addition of small amounts of water converts the lithium thiophenoxide contact ion pair complex into a solvent-separated ion pair complex. A smaller secondary α-deuterium kinetic isotope effect and a larger Hammett p value are observed when the nucleophile is the contact ion pair complex in the SN2 reaction between n-butyl chloride and thiophenoxide ion in diglyme. This i

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2

Hush, N. S. "Phenate ion and the Fe3+PhO− ion-pair complex." Recueil des Travaux Chimiques des Pays-Bas 75, no. 9 (2010): 1101–4. http://dx.doi.org/10.1002/recl.19560750915.

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3

Lai, Zhu-Gen, and Kenneth Charles Westaway. "Isotope effects in nucleophilic substitution reactions. VII. The effect of ion pairing on the substituent effects on SN2 transition state structure." Canadian Journal of Chemistry 67, no. 1 (1989): 21–26. http://dx.doi.org/10.1139/v89-004.

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The secondary α-deuterium kinetic isotope effects and substituent effect found in the SN2 reactions between a series of para-substituted sodium thiophenoxides and benzyldimethylphenylammonium ion are significantly larger when the reacting nucleophile is a free ion than when it is a solvent-separated ion pair complex. Tighter transition states are found when a poorer nucleophile is used in both the free ion and ion pair reactions. Also, the transition states for all but one substituent are tighter for the reactions with the solvent-separated ion pair complex than with the free ion. Hammett ρ va

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4

Singh, Raj Pal. "On the Existence of NaC2O4−Ion Pair Complex." Bulletin of the Chemical Society of Japan 62, no. 12 (1989): 4089–91. http://dx.doi.org/10.1246/bcsj.62.4089.

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5

M. Jamil, Dalia. "Characterization of a mixed-reagent ion-pair complex." International Journal of Research in Engineering and Innovation 07, no. 05 (2023): 210–14. http://dx.doi.org/10.36037/ijrei.2023.7504.

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A method has been proposed for the determination of drug containing amino group phenylephrine hydrochloride (PHP) in pharmaceutical dosage forms. The method is based on the ion pair reaction of this drug with reagent (egg yellow) in alkaline medium to give intense orange colored product (λmax at 470 nm of PHP) with molar absorptivity values of 1.67×105L.mol-1.cm-1 (r = 0.9995) and 5.60 ×105 L.mol-1.cm-1 (r = 0.9996), limit of detections of 0.0252 mg/L and 0.0236 mg/L and Limit of quantification of 0.0831 mg/L and 0.0708 mg/L respectively with concentration rang of (0.2-6.0) mg/L for drug. The

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6

Safa Majeed Hameed, Safa Majeed Hameed, Sahar Aqeel Hussain Sahar Aqeel Hussain, Mohammed Alaa Abdulzahra Mohammed Alaa Abdulzahra, and and Fawzi Yahya Wadday and Fawzi Yahya Wadday. "Separation and Spectroscopic Determination of Ge(IV) as an Ion Pair Association Complex Using DB18C6 Ligand." Journal of the chemical society of pakistan 46, no. 3 (2024): 281. http://dx.doi.org/10.52568/001465/jcsp/46.03.2024.

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A solvent extraction was applied using liquid ion exchange as a sensitive method to extract Germanium (IV) as anion complex K[GeO2(OH)2]- from basic media of KOH by used DB18C6 as a ligand dissolved in chloroform to form the ion pair association complex K-DB18C6+; K[GeO2(OH)2]-, the maximum wavelength of the extracted complex was λmax=290nm, and molar absorptive 1.269and#215;103 L/mol.cm. the Beerand#39;s –lambert law was adhered to within the specified range (1-20)ppm. The limits of detection and quantity were 0.034 and 0.102 ppm, respectively. The research studied optimal conditions of extra

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7

Kawther A. Sadeq. "Spectrophotometric Determination of Ciprofloxacin by Ion-pair complex Formation with Bromothymol Blue." journal of the college of basic education 17, no. 72 (2019): 93–100. http://dx.doi.org/10.35950/cbej.v17i72.4501.

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A new simple spectrophotometric method based on the formation of an ion –pair using bromothymol blue as ion –pair complexion reagent was developed for the determination of ciprofloxacin in pure form and tablets . Theion-pair formed was highly colored and easily extracted with chloroform at (pH3.0) and determined spectrophotometrically at 421 nm .The proposed method was successfully applied to determine (CPF) in its tablet formulation and the results are good , No interferences from an effective addition were noticed .

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8

A.Wannas, Fatimah, and Shawket K.Jawad. "Extraction and Determination of Nickel (Ii) Via Cloud Point Method." International Journal of Engineering & Technology 7, no. 4.36 (2018): 725. http://dx.doi.org/10.14419/ijet.v7i4.36.24231.

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Spectrophotometric study for ion pair complex of Ni(II) ion extracted into cloud point extraction larger appear wave length of maximum absorbance was λ=660 nm, for extracted Ni(II) ion as ion pair association ,used laboratory synthesized azo derivative 2-(4-hydroxy phenyl azo)-4-Benzen naphthol(HPAB).The study about Determination the optimum condition for extraction and determination was pH =10 in presence 100 µg Ni(II) in 10 ml aqueous solution ,0.6 mL of Triton x-114 and temperature of heating was 70 c° at heating time equal to 30 minute, stoichiometry shows the ion pair complex extracted wa

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9

Rajendraprasad, N., K. Basavaiah, and K. B. Vinay. "Sensitive Spectrophotometric Determination of Lamotrigine in Bulk Drug and Pharmaceutical Formulations using Bromocresol Green." Eclética Química Journal 35, no. 1 (2018): 55. http://dx.doi.org/10.26850/1678-4618eqj.v35.1.2010.p55-66.

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Two new, simple, rapid and reproducible spectrophotometric methods have been developed for the determination of lamotrigine (LMT) both in pure form and in its tablets. The first method (method A) is based on the formation of a colored ion-pair complex (1:1 drug/dye) of LMT with bromocresol green (BCG) at pH 5.02±0.01 and extraction of the complex into dichloromethane followed by the measurement of the yellow ion-pair complex at 410 nm. In the second (method B), the drug-dye ion-pair complex was dissolved in ethanolic potassium hydroxide and the resulting base form of the dye was measured at 62

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10

M., R. Keskar, and M. Jugade R. "A new spectrophotometric method for determination of amoxicillin using bromophenol blue." Education in Chemical Science and Technology Vol. 2, Aug 2022 (2022): 67–76. https://doi.org/10.5281/zenodo.6813279.

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Department of Chemistry, R. T. M. Nagpur University, University Campus, Amravati Road, Nagpur-440 033, Maharashtra, India E-mail : ravinj200l@yahoo.co.in Abstract : Simple and rapid spectrophotometric method has been developed for the determination of amoxicillin in bulk and pharmaceutical formulations. The method is based on formation of blue ion-pair complex between amoxicillin and bromophenol blue in dimethylsulphoxideacetonitrile medium with <em>λ</em>.<sub>max</sub> of 590 nm. Different conditions affecting the reaction have been studied and optimised. The composition of the comple

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11

Majcherczyk, A., and A. Hüttermann. "Size-exclusion chromatography of lignin as ion-pair complex." Journal of Chromatography A 764, no. 2 (1997): 183–91. http://dx.doi.org/10.1016/s0021-9673(96)00909-0.

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12

Maha. J. Jabbar and Fatima A.Wannas. "Preconcentration and Spectroscopic estimation of Zn (II) by sensitive Cloud Point Extraction Technique using Imidazole Azo Reagent." Journal of Kufa for Chemical Sciences 2, no. 9 (2023): 551–68. http://dx.doi.org/10.36329/jkcm/2022/v2.i9.13321.

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The organic reagent is using is [4 –CMePAI] ,the reagent was spectra methed by using (FT-IR), and (uv-vis) as an identification using Spectrophotometric study for ion pair complex of Zn(II) ion extracted into cloud point extraction, appeared wave length of maximum absorbance was λ =447 nm for organic reagent, λ =470 nm for extracted Zn (II) ion as ion- pair association, laboratory produced novel azo the study about Determination the optimum extraction and determination conditions were pH = 8 in the presence of 100 μg Zn (II) in 10 mL aqueous solution, 0.5 mL Triton X-114, and heating temperatu

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13

Alston, Jeffrey R., David J. Banks, Chauncey X. McNeill, et al. "Adsorption studies of divalent, dinuclear coordination complexes as molecular spacers on SWCNTs." Physical Chemistry Chemical Physics 17, no. 44 (2015): 29566–73. http://dx.doi.org/10.1039/c5cp05419b.

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14

Abdelmonem, Afaf A., Gamal H. Ragab, Hisham Hashem, and Eman A. Bahgat. "Simple Atomic Absorption Spectroscopic and Spectrophotometric Methods for Determination of Pioglitazone Hydrochloride and Carvedilol in Pharmaceutical Dosage Forms." International Journal of Spectroscopy 2014 (May 18, 2014): 1–17. http://dx.doi.org/10.1155/2014/768917.

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This study represents simple atomic absorption spectroscopic and spectrophotometric methods for determination of pioglitazone hydrochloride (PGZ-HCl) and carvedilol (CRV) based on formation of ion-pair associates between drugs and inorganic complex, bismuth(III) tetraiodide (Method A) and between drugs and organic acidic dyes, fast green and orange G (Method B). Method A is based on formation of ion-pair associate between drugs and bismuth(III) tetraiodide in acidic medium to form orange-red ion-pair associates, which can be quantitatively determined by two different procedures. The formed ion

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15

Nemec, Ivan, Pavel Zoufalý, Pawel Jewula, Peter Antal, Wolfgang Linert, and Radovan Herchel. "Ion-pair complexes of Schiff base Fe(iii) cations and complex anions." New Journal of Chemistry 43, no. 12 (2019): 4937–46. http://dx.doi.org/10.1039/c9nj00192a.

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16

Singh, Raj P., Yaw D. Yeboah, Ernesto R. Pambid, and Pascal Debayle. "Stability constant of the calcium-citrate(3-) ion pair complex." Journal of Chemical & Engineering Data 36, no. 1 (1991): 52–54. http://dx.doi.org/10.1021/je00001a015.

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17

Kaledin, Alexey L., Qiushi Yin, Craig L. Hill, Tianquan Lian, and Djamaladdin G. Musaev. "Ion-pairing in polyoxometalate chemistry: impact of fully hydrated alkali metal cations on properties of the keggin [PW12O40]3− anion." Dalton Transactions 49, no. 32 (2020): 11170–78. http://dx.doi.org/10.1039/d0dt02239j.

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The [PW<sub>12</sub>O<sub>40</sub>]<sup>3−</sup>[M<sup>+</sup>(H<sub>2</sub>O)<sub>16</sub>]<sub>3</sub> is a “hydrogen bonded” ion-pair complex for M = Li, Na and K, but is a “contact” ion-pair complex for M = Rb and Cs, intermolecular charge transfer from the solvated counter cations M<sup>+</sup>(H<sub>2</sub>O)<sub>16</sub> to the anion [PW<sub>12</sub>O<sub>40</sub>]<sup>3−</sup>.

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18

Westaway, Kenneth Charles, and Zhu-Gen Lai. "Isotope effects in nucleophilic substitution reactions. VI. The effect of ion pairing on the transition state structure of SN2 reactions." Canadian Journal of Chemistry 66, no. 5 (1988): 1263–71. http://dx.doi.org/10.1139/v88-205.

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Spectroscopic and conductivity studies of sodium thiophenoxide solutions in four different solvents and the secondary α-deuterium kinetic isotope effects found in the presence of 15-crown-5 ether demonstrate that the secondary α-deuterium kinetic isotope effect and transition state structure for the SN2 reaction between sodium thiophenoxide and n-butyl chloride are significantly different, depending on whether the ionic reactant is a solvent-separated ion-pair complex or a free ion. In all three solvents in which the form of the ionic reactant changes, a smaller isotope effect and tighter tran

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19

Reddy, K. M., K. Suvardhan, K. Suresh Kumar, D. Rekha, and P. Chiranjeevi. "Extractive Spectrophotometric Determination of Malathion in Environmental Samples Using Gention Violet." E-Journal of Chemistry 2, no. 3 (2005): 187–92. http://dx.doi.org/10.1155/2005/690275.

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A new simple and selective spectrophotometric method is developed for the determination of malathion by using Gention violet is described. The method was based on the alkaline hydrolysis of malathion in presence of sodium ethoxide to form sodium dimethyl dithiophosphate (Na-DMDTP). The Na-DMDTP was formed as an ion-pair complex with cationic dye, gention violet. The ion-pair complex was extracted into chloroform. The color of the organic layer was measured at 587 nm. The method was applied to the determination of malathion residues in water, grain and soil samples

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Reddy, K. M., and P. Chiranjeevi. "Extractive Spectrophotometric determination of Dimethoate in Environmental Samples with Azure-B." E-Journal of Chemistry 2, no. 3 (2005): 193–98. http://dx.doi.org/10.1155/2005/103875.

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A new simple and selective spectrophotometric method is developed for the determination of dimethoate by using Azure-B is described. The method was based on the alkaline hydrolysis of dimethoate in presence of sodium ethoxide to form sodium dimethyl dithiophosphate (Na-DMDTP). The Na-DMDTP was formed as an ion-pair complex with cationic dye, azure-B. The ion-pair complex was extracted into chloroform. The color of the organic layer was measured at 535 nm. The method was applied to the determination of dimethoate residues in water, grain and soil samples.

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21

Roe, J. N., F. C. Szoka, and A. S. Verkman. "Colorimetric Detection of Alkali Metals by Ion-Pair Extraction." Applied Spectroscopy 43, no. 4 (1989): 656–61. http://dx.doi.org/10.1366/0003702894202607.

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An optical absorbance method was developed to measure the concentration of alkali metal ions in aqueous solution at neutral pH. The method was based on the formation of a ternary complex between an ionophore/metal ion complex and the anionic form of 7-( n-decyl)-2-methyl-4-(3′,5′-dichlorophen-4′-one)-indonapthl-1-ol (MEDPIN). Detection of the ternary complex was made in the organic phase after ion-pair extraction. Concentrations of sodium and potassium in the aqueous phase were detectable with high sensitivity and selectivity. The absorbance spectrum of MEDPIN in octanol was strongly dependent

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22

Chou, Chang-Chuan, Yu-Ting Lai, Chia-Chi Yang, and Ting-Sen Kuo. "Rapid access to sulfate-encapsulated symmetrical and asymmetrical capsules based on silver–pyrazole complex cations." New Journal of Chemistry 43, no. 27 (2019): 10680–84. http://dx.doi.org/10.1039/c9nj02105a.

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23

P., Jagadeesh U. Srikanth M. M. Eswarudu* P. Srinivasa Babu Sk. Aneesh P.S.H. R. Khan S. Sai Pooja K. Naga Rani. "NEW VALIDATED EXTRACTIVE SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF RUFINAMIDE IN BULK AND ITS PHARMACEUTICAL DOSAGE FORM." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES o6, no. 06 (2019): 11798–805. https://doi.org/10.5281/zenodo.3244150.

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<em>A simple, precise, selective and affordable spectrphotometric method has been developed for the determination of Rufinamide in its bulk and pharmaceutical dosage form. The method was based on ion-pair complex formation between the drug and anionic dye i.e. Bromothymol blue in acidic medium (pH 2.0-4.0). The coloured complex formed was quantitatively extracted into chloroform and measured wavelength at 416.5 nm. Beer’s law was obeyed in the concentration range of 10-60µg/ml with correlation coefficient (n=6) ≥ 0.997. The stoichiometry of the complexes formed between drug and

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24

Soylak, Mustafa, Haldun Hilmi Gorucu, and Erkan Yilmaz. "Micelle-based restricted access ion-pair microextraction of phosphate at trace levels in water samples for separation, preconcentration and determination." EuroBiotech Journal 4, no. 2 (2020): 89–96. http://dx.doi.org/10.2478/ebtj-2020-0010.

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AbstractA new and simple micelles-rich restricted access supramolecular solvent-based liquid phase microextraction method (RASUPRASs-LPME) based on the ion-pair complex formation of phosphate (PO43-) ions with ammonium heptamolybdate and malachite green in acidic medium was developed. The phosphate ion concentration after microextraction of the ion-pair complex to the hexagonal aggregates of decanoic acid (DA) was measured with micro-volume UV-Vis spectrophotometer at 625 nm. All analytical parameters which are effective on the method such as acid type and concentration, supramolecular solvent

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25

Ito, Wataru, Shingo Hattori, Mio Kondo, et al. "Dual emission from an iridium(iii) complex/counter anion ion pair." Dalton Transactions 50, no. 5 (2021): 1887–94. http://dx.doi.org/10.1039/d1dt00021g.

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[Ir(tpy)<sub>2</sub>](PF<sub>6</sub>)<sub>3</sub> (tpy = 2,2′:6′,2′′-terpyridine) dissolved in CH<sub>3</sub>CN was found to exhibit dual color luminescent emission depending on the excitation wavelength.

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26

Ito, Fuyuki, Takayasu Nagai, Yasuhiro Sota, and Toshihiko Nagamura. "Fluorescence properties of ion pair charge transfer complex with bithiophene group." Journal of Photochemistry and Photobiology A: Chemistry 212, no. 2-3 (2010): 142–46. http://dx.doi.org/10.1016/j.jphotochem.2010.04.007.

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27

Mostafa, Samia, Mohamed El-Sadek, and Esmail Awad Alla. "Spectrophotometric determination of enrofloxacin and pefloxacin through ion-pair complex formation." Journal of Pharmaceutical and Biomedical Analysis 28, no. 1 (2002): 173–80. http://dx.doi.org/10.1016/s0731-7085(01)00591-x.

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28

Bult, A., and W. P. van Bennekom. "Determinations based on two-phase ion-pair and metal-complex formation." TrAC Trends in Analytical Chemistry 4, no. 10 (1985): 252–56. http://dx.doi.org/10.1016/0165-9936(85)87044-8.

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29

Ghusoon Jawad Shabaa. "Cloud point extraction for separation, preconcentration and determination zinc (ii) in different pharmaceutical samples." International Journal of Research in Pharmaceutical Sciences 10, no. 4 (2019): 3006–12. http://dx.doi.org/10.26452/ijrps.v10i4.1587.

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Joining solvent extraction with cloud point extraction methods obtained a susceptible method for separation, pre-concentration, extraction and categorization of Zn (II), after forming an ion-pair association complex between Zn+2 and 4-(3-methyl phenyl azo)-4,5- diphenyl imidazole (MPADPI) with wavelength for maximum absorbance λmax.=496 Nm. This study shows optimum conditions for the formation and exaction ion-pair association complex under pH=9 and 0.5 mL Tritonx-100, 1×10-4 M (MPADPI) and heating at 80 Co for 20 minutes so that this study involved the effect of electrolyte and interferences

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Derayea, Sayed M., Mohamed Oraby, Al Amir S. Zaafan, Ahmed Abdulhafez Hamad, and Dalia M. Nagy. "A facile on–off fluorescence approach for fluvoxamine determination in pharmaceutical tablets; application to content uniformity testing." RSC Advances 14, no. 12 (2024): 8283–92. http://dx.doi.org/10.1039/d3ra08257a.

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31

Cvetnić, Marija, Tamara Rinkovec, Robert Vianello, Gordan Horvat, Nikola Bregović, and Vladislav Tomišić. "A Detailed Thermodynamic Description of Ion Pair Binding by a Calix[4]arene Derivative Containing Urea and Amide Functionalities." Molecules 30, no. 11 (2025): 2464. https://doi.org/10.3390/molecules30112464.

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Receptors capable of binding both positive and negative ions are an important domain of supramolecular chemistry with valuable application potential. A Complete thermodynamic description of the equilibria related to ion pair recognition is beneficial in developing the optimized receptor systems, although it represents a difficult task that is rarely resolved due to various coupled processes. Here, we present a comprehensive study of ion pair (NaCl, NaHSO4, and NaH2PO4) binding by a ureido–amide calix[4]arene host in acetonitrile using a series of experimental techniques and molecular dynamics

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Away, Kenneth Charles West, and Zhu-Gen Lai. "Solvent effects on SN2 transition state structure. II: The effect of ion pairing on the solvent effect on transition state structure." Canadian Journal of Chemistry 67, no. 2 (1989): 345–49. http://dx.doi.org/10.1139/v89-056.

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Identical secondary α-deuterium kinetic isotope effects (transition state structures) in the SN2 reaction between n-butyl chloride and a free thiophenoxide ion in aprotic and protic solvents confirm the validity of the Solvation Rule for SN2 Reactions. These isotope effects also suggest that hydrogen bonding from the solvent to the developing chloride ion in the SN2 transition state does not have a marked effect on the magnitude of the chlorine (leaving group) kinetic isotope effects. Unlike the free ion reactions, the secondary α-deuterium kinetic isotope effect (transition state structure) f

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Yaftian, M. R., A. A. Zamani, M. Parinejad, and E. Shams. "Ion-pair extraction of cadmium complex anions from hydrochloric acid media using oxonium ion-dicyclohexyl-18-crown-6 complex." Separation and Purification Technology 42, no. 2 (2005): 175–80. http://dx.doi.org/10.1016/j.seppur.2004.07.011.

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Rudolph, Wolfram, and Gert Irmer. "Hydration and Ion Pair Formation in Aqueous Lu3+- Solution." Molecules 23, no. 12 (2018): 3237. http://dx.doi.org/10.3390/molecules23123237.

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Aqueous solutions of Lu3+- perchlorate, triflate and chloride were measured by Raman spectroscopy. A weak, isotropic mode at 396 cm−1 (full width at half height (fwhh) at 50 cm−1) was observed in perchlorate and triflate solutions. This mode was assigned to the totally symmetric stretching mode of [Lu(OH2)8]3+, ν1LuO8. In Lu(ClO4)3 solutions in heavy water, the ν1LuO8 symmetric stretch of [Lu(OD2)8]3+ appears at 376.5 cm−1. The shift confirms the theoretical isotopic effect of this mode. In the anisotropic scattering of aqueous Lu(ClO4)3, five bands of very low intensity were observed at 113 c

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Lenik, Joanna, and Cecylia Wardak. "Properties of ibuprofen ion-selective electrodes based on the ion pair complex of tetraoctylammonium cation." Open Chemistry 8, no. 2 (2010): 382–91. http://dx.doi.org/10.2478/s11532-010-0005-3.

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AbstractIbuprofen membrane electrodes based on different plasticizers: diisobutyl phthalate (DIBP), o-nitrophenyloctyl ether (o-NPOE), dioctyl sebacate (DOS) and tetraoctylammonium 2-(4-isobutylphenyl)propionate were prepared. All electrodes show: a near Nernstian slope of characteristic (58.3–60.9 mV decade−1) in the measurement range (10−4–10−1 mol L−1), limit of detection (5.0×10−5 mol L−1), really long lifetime (12 months), dependence of the electrode potential on pH (5.5–9.0), reproducibility of potential (0.6–1.2 mV) and selectivity coefficients in relation to some organic and inorganic

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36

K. Jawad, Shawket, and Nemah Sahib Mohummed Husien. "Solvent Extraction Method for Separation and Determination of Zn (||) by Using of Imidazole Derivative." International Journal of Engineering & Technology 7, no. 4.36 (2018): 553. http://dx.doi.org/10.14419/ijet.v7i4.36.24136.

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Solvent extraction as sensitive and effective method for separation, pre concentration and determination Zn+2 after converted the cation into ion pair complex by combination, coordinately with complexion agent 2-[(2-methylphenyl)azo]-4,5-diphenyl imidazol (MPADPI). Spectrophotometric study shows wave length for maximum absorbance of complication reagent equal to λmax= 405nm but maximum absorbance wave length for ion pair complex extracted of Zn+2 equal to λmax=535nm. The experimental studies for pin point the optimum conditions of extraction shows pH=10 in presence 50µg Zn+2 in 5mL with shakin

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Kumar, Manoj, and Joseph S. Francisco. "Ion pair particles at the air–water interface." Proceedings of the National Academy of Sciences 114, no. 47 (2017): 12401–6. http://dx.doi.org/10.1073/pnas.1709118114.

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Although the role of methanesulfonic acid (HMSA) in particle formation in the gas phase has been extensively studied, the details of the HMSA-induced ion pair particle formation at the air–water interface are yet to be examined. In this work, we have performed Born–Oppenheimer molecular dynamics simulations and density functional theory calculations to investigate the ion pair particle formation from HMSA and (R1)(R2)NH (for NH3, R1= R2= H; for CH3NH2, R1= H and R2= CH3; and for CH3NH2, R1= R2= CH3) at the air–water interface. The results show that, at the air–water interface, HMSA deprotonate

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38

Wankowski, James L., Michael J. Kaul, and Mark L. Dietz. "Micelle formation as a factor influencing the mode(s) of metal ion partitioning into N-alkylpyridinium-based ionic liquids (ILs): implications for the design of IL-based extraction systems." Green Chemistry 19, no. 23 (2017): 5674–82. http://dx.doi.org/10.1039/c7gc02338c.

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In the extraction of alkali and alkaline earth cations by a crown ether into certain N-alkylpyridinium-based ILs, the balance between neutral complex/ion-pair partitioning and ion exchange is significantly altered by the formation of micelles in the aqueous phase involving the IL cation.

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Sawatlon, Boodsarin, and Panida Surawatanawong. "Mechanisms for dehydrogenation and hydrogenation of N-heterocycles using PNP-pincer-supported iron catalysts: a density functional study." Dalton Transactions 45, no. 38 (2016): 14965–78. http://dx.doi.org/10.1039/c6dt02431a.

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Maha, Abu Hajleh, and Al-Dujaili Emad A.S. "HYDROPHOBIC ION-PAIRED DRUG DELIVERY SYSTEM: A REVIEW." INDIAN DRUGS 57, no. 01 (2020): 7–18. http://dx.doi.org/10.53879/id.57.01.12071.

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Hydrophobic ion-pairing (HIP) complexation technique has been displayed to modify the physicochemical properties, solubility, oral absorption, bioavailability, and the lipophilicity of an ionic drug in the lipid phase. This could affect a higher permeation through biological membranes. HIP complexation was considered through the formation of a neutral molecule by electrostatic interaction of ionizable groups of drugs with oppositely charged functional groups of a complex-forming agent. Subsequently, this ion-pair may encapsulate into many delivery systems. The objective of this manuscript was

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Khan, M. Niyaz. "Salt and solvent effects on alkaline hydrolysis of N‐hydroxyphthalimide. Kinetic evidence for ion‐pair formation." Journal of Physical Organic Chemistry 7, no. 8 (1994): 412–19. http://dx.doi.org/10.1002/poc.610070805.

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AbstractThe effects of the concentrations of LiCl, NaCl, KCl, CsCl, Na2CO3 and BaCl2 on the rates of reactions of hydroxide ion with ionized N‐hydroxyphthalimide (NHP−) at 30°C and in H2O–MeCN solvents containing 10, 50, 60, 66, 70, 76 and 80% (v/v) MeCN reveal the formation of ion‐pair complexes between cations of the salts, which probably exist in solvent‐separated loose ion‐pair forms (Mn+ ⃛Xk−) and NHP−. An increase in MeCN content from 2 to 76% (v/v) causes an increase in the association constants (K) by factors of 40, 21 and 9 for LiCl, NaCl and KCl, respectively, while the respective in

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Burungale, S. H., R. S. Patil, and A. V. Mali. "REMOVAL OF LEAD (II) WITH POLY 3-(AZA-18-CROWN-6) SILICA BONDED PHASE FROM SUCCINATE MEDIUM AND SAMPLES ANALYSIS." Journal of Advanced Scientific Research 12, no. 03 (2021): 146–51. http://dx.doi.org/10.55218/jasr.202112321.

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A method was described for the determination of micro amount of lead (II) with Poly 3-(Aza-18-crown-6) Silica bonded phase employed as an ion-pair forming a neutral complex from Sodium succinate medium (0.01 to 3.0 M). The adsorbed ion-pair complex was back eluted with 0.5 M hydrochloric acid and determined spectrophotometrically with PAR. The various parameters like concentration of acid, equilibrium time, back eluting agents, loading capacity were optimized for quantitative adsorption of lead (II). The applicability of the proposed method was successfully applied to the analysis of diverse i

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McMahon, Brian K., and David Parker. "Selective ion pair recognition of citrate and zinc ions in water by ratiometric luminescence signaling." RSC Adv. 4, no. 71 (2014): 37649–54. http://dx.doi.org/10.1039/c4ra07894b.

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DEBABRATA, CHATTERJEE B., and S. DE G. "Solvent Effect on the Kinetics of Anation of Hydroxopentaquocbromium(III) Ion by DL· Valine." Journal of Indian Chemical Society Vol. 66, Dec 1989 (1989): 854–57. https://doi.org/10.5281/zenodo.5995812.

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Department of Chemistry, University of Burdwan, Burdwan-713 104 <em>Manuscript received 14 October 1988, revised 18 May 1989, accepted 22 July 1989</em> Spectrophotometric investigation of the titled reaction has been done at different temperatures (40— 50°) and a rate law has been established in the pH range 4.5 — 5.2. The values of the ion-pair equilibrium constant between substrate complex and zwitterionic valine (K<sub><em>E</em></sub>) and the interchange rate constant from outer-sphere complex to inner-sphere product (K<sub>a</sub>) have been discussed. Nitrate ion have b

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Zhang, Lai-Jun, Xing-Can Shen та Hong Liang. "4,4′-Bipyridinium bis(oxalato-κ2O1,O2)cuprate(II): an ion-pair complex". Acta Crystallographica Section E Structure Reports Online 65, № 11 (2009): m1276—m1277. http://dx.doi.org/10.1107/s1600536809039117.

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Ilczyszyn, Marek, Henryk Ratajczak, and Krzysztof Skowronek. "13C NMR investigations of phenol-triethylamine complexes: Ion pair-molecular complex tautomerism." Magnetic Resonance in Chemistry 26, no. 6 (1988): 445–48. http://dx.doi.org/10.1002/mrc.1260260602.

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Kudo, Yoshihiro, Yota Kobayashi, Shoichi Katsuta, and Yasuyuki Takeda. "Ion-pair formation of cadmium-18-crown-6 ethers complex ions with picrate and chloride ions in water and distribution of its picrate ion-pair complex into benzene." Journal of Molecular Liquids 146, no. 1-2 (2009): 60–65. http://dx.doi.org/10.1016/j.molliq.2009.02.004.

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Suryavanshi, Vishal J., Rupali R. Pawar, Mansing A. Anuse, and Ganpatrao N. Mulik. "2-Octylaminopyridine assisted solvent extraction system for selective separation of palladium(ii) ion-pair complex from synthetic mixtures and real samples." Analytical Methods 7, no. 6 (2015): 2497–504. http://dx.doi.org/10.1039/c4ay03045a.

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Hameed, Faris, and Shawket K. Jawad. "Cloud Point Extraction with Liquid Ion Exchange for Separation and Determination Magnesium (II) as anion." Iraqi Journal of Nanotechnology, no. 2 (December 7, 2021): 20–33. http://dx.doi.org/10.47758/ijn.vi2.46.

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Liquid Ion Exchange joined with Cloud point extraction methodology was used for the separation of Magnesium (II) from aqueous and determine whereas 10 mL aqueous solution that contains 50 µg Mg2+ ion is complex with 1×10-3M 8-Hydroxy quinoline (8-HQ) at a suitable basic medium it well give higher extraction efficiency at optimum conditions, needs heating the aqueous solution in suitable temperature degree for enough time to form a cloud point layer (CPL). Therefore, the optimum conditions that yielded the good CPL have a small aggregation volume which is appropriate for continuing the ion pair

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Zeitouni, Farah, Gehan El-Subruiti, Ghassan Younes, and Mohammad Amira. "Kinetics of Ion-Pair Effect of Aquation of Bromopentaammine Cobalt(III) Complex in Different Dicarboxylate Media." Advanced Materials Research 324 (August 2011): 166–69. http://dx.doi.org/10.4028/www.scientific.net/amr.324.166.

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The rate of aquation of bromopentaammine cobalt(III) ion in the presence of different types of dicarboxylate solutions containing tert-butanol (40% V/V) have been measured spectrophotometrically at different temperatures (30-600°C) in the light of the effects of ion-pairing on reaction rates and mechanism. The thermodynamic and extrathermodynamic parameters of activation have been calculated and discussed in terms of solvent effect on the ion-pair aquation reaction. The free energy of activation ∆Gip* is more or less linearly varied among the studied dicarboxylate ion-pairing ligands indicatin

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