Acid—Base Properties of Sulfur‐Bridged Calix[4]arenes (I).

Matsumiya, Hiroaki; Terazono, Yukiko; Iki, Nobuhiko; Miyano, Sotaro

doi:10.1002/chin.200235067

Cited by 3 publications

(4 citation statements)

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“…The pH value for this C4AS þ MVC 12 system is 5.31. According to the pK a values of lower-rim phenolic hydroxyl groups of C4AS (pK a values =3.08, 12.02), 88 at least one phenol group is deprotonated at this pH value. The release of DOX from DOX-loaded vesicles at 60 °C, with the addition of Triton X-100, and with the addition of R-CD by dialysis method was performed as follows: The DOX-loaded vesicles at 60 °C, with the addition of Triton X-100, or with the addition of excess R-CD were dialyzed (molecular weight cutoff = 3500) against the deionized water for several times until the water outside the dialysis tube exhibited negligible DOX fluorescence.…”

Section: Methodsmentioning

confidence: 99%

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Multistimuli Responsive Supramolecular Vesicles Based on the Recognition of p-Sulfonatocalixarene and its Controllable Release of Doxorubicin

et al. 2011

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We report the novel construction of nanosupramolecular binary vesicles based on host-guest complex formation between p-sulfonatocalix[4]arene and asymmetric viologen, which was identified by UV-vis and fluorescence spectroscopy, dynamic laser scattering, transmission electron microscopy, scanning electron microscopy, and surface tension experiments. The critical aggregation concentration of asymmetric viologen decreases pronouncedly by a factor of ca. 1000 owing to the complexation of p-sulfonatocalix[4]arene. Furthermore, we have demonstrated that the resulting vesicles can respond to multiple external stimuli, including temperature, host-guest inclusion, and redox. Methods of warming and inclusion of cyclodextrins were then employed to disrupt the vesicle architecture to release hydrophilic doxorubicin from the interior of the vesicle. Finally, cell experiments were performed to evaluate the cellular toxicity of the supramolecular binary vesicle and the anticancer efficiency of doxorubicin-loaded vesicle.

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Section: Methodsmentioning

confidence: 99%

“…The pH value for this C4AS + MVC 12 system is 5.31. According to the p K a values of lower-rim phenolic hydroxyl groups of C4AS (p K a values =3.08, 12.02), at least one phenol group is deprotonated at this pH value.…”

Section: Methodsmentioning

confidence: 99%

Multistimuli Responsive Supramolecular Vesicles Based on the Recognition of p-Sulfonatocalixarene and its Controllable Release of Doxorubicin

et al. 2011

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“…The maximum E (%) values were observed at pH 3–4. Significantly lower values were observed in low-pH media: At pH 0.5–2, the hydroxy groups in 3 and 4 are protonated, − which impairs their complexation with Pd(II). At pH 3.0–6.0, some of the hydroxy groups in 3 and 4 remain deprotonated; the number of deprotonated hydroxyl groups increases from pH 3.0 to 6.0, which results in an increase in E (%) because of the formation of coordination complexes between the Pd(II) ions and the O – and S atoms of 3 and 4 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Dimethylthiocarbamoyl-Modified Thiacalix[n]arenes for Selective Pd(II)-Ion Extraction

Gandhi

Yamada

Kondo

et al. 2014

Ind. Eng. Chem. Res.

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In this study, two extractants, hexakis[(dimethylthiocarbamoyl)oxy]thiacalix[6]arene (1) and tetrakis[(dimethylthiocarbamoyl)oxy]thiacalix[4]arene (2), were synthesized by the reaction of dimethylthiocarbamoyl chloride with p-tert-butylthiacalix[n]arenes (n = 6 and 4) and characterized using 1H NMR and FT-IR spectroscopies, elemental analysis, and fast-atom-bombardment mass spectrometry (FAB-MS). These compounds were extensively evaluated for the extraction of Pd(II) ions from HCl media and solutions of platinum-group metals from automotive catalyst residues, using various solvents. Compounds 1 and 2 were found to have higher Pd(II)-ion extraction abilities (0.57 and 0.48 g/L, respectively) than the native p-tert-butylthiacalix[6]arene (3) and p-tert-butylthiacalix[4]arene (4) (0.46 and 0.20 g/L, respectively), using 1 mM extractant and 9.4 mM Pd(II)-ion solutions in HCl media. The extractant–Pd(II) complexes were characterized using FT-IR spectroscopy, elemental analysis, XRD, Job’s continuous method, and TGA/DTA. Stripping of the Pd(II) ions from the extractants was performed using 1 M thiourea, thereby enabling the reuse of the extractants.

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“…Currently, a number of analytical techniques have been developed for iron determination, including atomic absorption spectrophotometry [6], inductively coupled plasma mass spectrometry [7], liquid chromatography [8,9], electrochemistry [10,11] and spectrofluorimetry [12,13] and flow-based techniques [14][15][16][17][18]. The latter is one of the most efficient method that is frequently used for iron determination, particularly in the form of Fe(III) assays.…”

Section: Introductionmentioning

confidence: 99%

Miniaturization of spectrophotometry based on micro flow analysis using norfloxacin as less-toxic reagent for iron determination

Prasertboonyai

Arqueropanyo

Liawraungrath

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Acid—Base Properties of Sulfur‐Bridged Calix[4]arenes (I).

Cited by 3 publications

References 1 publication

Multistimuli Responsive Supramolecular Vesicles Based on the Recognition of p-Sulfonatocalixarene and its Controllable Release of Doxorubicin

Multistimuli Responsive Supramolecular Vesicles Based on the Recognition of p-Sulfonatocalixarene and its Controllable Release of Doxorubicin

Synthesis and Characterization of Dimethylthiocarbamoyl-Modified Thiacalix[n]arenes for Selective Pd(II)-Ion Extraction

Miniaturization of spectrophotometry based on micro flow analysis using norfloxacin as less-toxic reagent for iron determination

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