Efficient evaluation of poly(oxyethylene) complex formation with alkali-metal cations

Okada, Tetsuo

doi:10.1021/ma00221a006

Cited by 59 publications

(39 citation statements)

References 4 publications

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“…65 In the separation sciences, polyethers have been mainly used for the separation of cations, while very little attention has been paid to the separation of polyethers themselves. It has been reported that the chromatographic separation of polyethers provides very useful information on the solution behaviors of polyethers [66][67][68][69][70] , which cannot be elucidated by other methods.…”

Section: ·4 Polyether Complexation At the Surface Of Ion-exchange Rementioning

confidence: 99%

Interpretation of Chromatographic Retention Based on Electrostatic Theories

Okada

1998

ANAL. SCI.

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Electrostatic potential is responsible for various phenomena, particularly for the behaviors of ionic species in solution and at various interfaces. In some modes of chromatography, electrostatic interaction often governs overall retention selectivity; ion-exchange chromatography is a typical example. Thus, though the understanding of electrostatic interaction is essential to interpret and predict chromatographic retention in some cases, sufficient attention has not been paid to its roles. There are some possible reasons for this situation: (1) direct estimation of the potential is usually difficult; (2) simple models not involving the contribution from electrostatic potential have given rather good explanations to experimental data. Some research groups have recently attempted to take electrostatic potential effects into consideration in various ways, and have successfully developed chromatographic models. These approaches are expected to facilitate understanding of chromatographic phenomena dominantly controlled by electrostatic interaction and to provide a view of more physical significance. In this review, the author mentions advantages of chromatographic models based on electrostatic theory over usual separated-phase models, and shows problems to be solved.

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Section: ·4 Polyether Complexation At the Surface Of Ion-exchange Rementioning

confidence: 99%

Interpretation of Chromatographic Retention Based on Electrostatic Theories

Okada

1998

ANAL. SCI.

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“…Other applications, such as protein extraction, oil recovery as well as metal cation extraction, have also been reported [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Emulsion Properties and Phase Equilibrium and of New Asymmetric Gemini Surfactants Consisting of Fatty Acid Esters of Polyethoxylated Alcohol or Phenol

Nowicki

2009

J Surfact & Detergents

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The emulsion and phase properties of watersurfactant systems are reported for nonionic surface active compounds of the asymmetrical gemini type resulting from the esterification of a polyethoxylated alcohol and a fatty acid. These products exhibit typical gemini surfactant properties, in particular, low critical micelle concentration (CMC) and good emulsifying properties, and they often form a gel depending on the temperature and concentration.

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“…For investigating polyether complexation, we have developed efficient means based on separation techniques, such as cation-exchange chromatography [19][20][21][22] , anion-exchange chromatography 23,24 , and capillary electrophoresis. 25 These methods have permitted us to elucidate polyether chemistry, which is difficult to study with conventional spectrometric, electrochemical, and thermodynamic methods.…”

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confidence: 99%

Stationary-Phase Complexation of Crown Ethers with Polyammonium Ions Chemically Bonded on Polymer Resin

Biswas

Okada

1999

ANAL. SCI.

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Crown ether complexation has received much attention, though more than three decades have passed since this class of compounds was first synthesized by Pedersen.1 One typical question in crown-ether chemistry is how the selectivity in crown ether complexation emerges. Understanding the origin of the selectivity in crown-ether complexation is not only of fundamental interest, but also of practical importance. Various thermodynamic 2-4 , structural [5][6][7][8] , and computational research efforts 9,10 have been conducted to answer this question. The size-fit theory was a widely accepted concept to explain crown-ether complexation selectivity, and is still regarded as a dominant factor in some instances. However, there are a number of examples in which the selectivity does not follow simple size-fit theories. 11Thus, it is reasonable to regard size-fit as one of the important factors governing crown ether complexation selectivity.Crown ether complexation with simple metal cations has been most extensively studied, because simple inorganic cations are well characterized; thus, a number of reliable physicochemical data are available, which allow us to quantitatively discuss the thermodynamic and structural aspects of crown ether complexes. This background in fundamental chemistry has allowed us to develop a variety of analytical methods based on crown ether complexation. Crown ethers have been utilized for separation [12][13][14] , ion selective electrodes 15,16 , and optical sensors 17,18 for simple inorganic cations (mainly metal cations). In contrast, studies on the complexation of crown ethers with organic cations have been relatively few. However, this does not necessarily mean that organic cations are less important than inorganic cations in crown ether chemistry; on the contrary, complexation with organic cations including the conjugate acids of amines and aminoacids is expected to become more important in biological, biochemical, medical, and pharmaceutical sciences.For investigating polyether complexation, we have developed efficient means based on separation techniques, such as cation-exchange chromatography 19-22 , anion-exchange chromatography 23,24 , and capillary electrophoresis. 25 These methods have permitted us to elucidate polyether chemistry, which is difficult to study with conventional spectrometric, electrochemical, and thermodynamic methods. In the present work, we chromatographically studied the complexation behaviors of crown ethers with polyammonium ions anchored on a polymer resin. The purposes of this work were (1) to characterize the retention of crown ethers in these stationary phases, (2) to elucidate the phenomena which take place in or on the stationary phases, and (3) to show that the stationary phases are useful to study polyether complexation. The complexation of crown ethers with polyammonium ions has not been investigated very well, even in solution. Thus, the present method is expected to elucidate important aspects of crown ether complexation with polyammonium ions. Experiment...

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Efficient evaluation of poly(oxyethylene) complex formation with alkali-metal cations

Cited by 59 publications

References 4 publications

Interpretation of Chromatographic Retention Based on Electrostatic Theories

Interpretation of Chromatographic Retention Based on Electrostatic Theories

Emulsion Properties and Phase Equilibrium and of New Asymmetric Gemini Surfactants Consisting of Fatty Acid Esters of Polyethoxylated Alcohol or Phenol

Stationary-Phase Complexation of Crown Ethers with Polyammonium Ions Chemically Bonded on Polymer Resin

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