Category: 101079-29-2

Paleologos, Evangelos K. published the artcileCationic surfactant-based polyfluorate salts: Phase separation and analytical applications in the extraction and preconcentration of ionic species prior to liquid chromatography, Application of N-hexadecyltrimethylammoniumhexafluorophosphate, the publication is Journal of Chromatography A (2005), 1066(1-2), 19-25, database is CAplus and MEDLINE.

The liquid-solid phase separation originating from the formation of cationic surfactant-based polyfluorate salts (CSBPS) has been explored for extracting and preconcg. ionic species. Two cationic surfactants were tested; one with aliphatic hydrocarbon tail [Cetyltrimethylammonium bromide (CTAB)]and the other containing a heterocyclic ring [Hexadecylpyridinium bromide (HPyBr)]. Phase separation possibility was investigated with the use of hexafluorophosphates (PF₆^–) and tetrafluoroborates (BF₄^–). The effect of added acid, base and salt on the phase separation and analyte extraction was also investigated. In all cases the obtained phase diagrams consisted of two regions: a homogeneous liquid region and a solid-liquid region. Analytes of hydrophilic and hydrophobic nature such as amines, amino acids and organic chromophores were used as test compounds in both their anionic and cationic forms. The resp. recoveries ranged from over 90% for anionic species and in the proximity of 50% for cationic species, remaining below 20% for neutral species. Extracts from alk. aqueous and plasma samples spiked with tyrosine and phenylalanine were also subjected to HPLC separation with UV detection with satisfactory results. On line application was also enabled using a flow through-solid phase extraction-HPLC hyphenated apparatus, thus adding the element of automatization and increased reproducibility.

Journal of Chromatography A published new progress about 101079-29-2. 101079-29-2 belongs to catalysis-chemistry, auxiliary class Surfactants, name is N-hexadecyltrimethylammoniumhexafluorophosphate, and the molecular formula is C19H42F6NP, Application of N-hexadecyltrimethylammoniumhexafluorophosphate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Yamamoto, Yukio published the artcilePulse radiolysis of trans-stilbene in tetrahydrofuran. Spectral shift and decay kinetics of the radical anions in the presence of quaternary ammonium salts, Synthetic Route of 101079-29-2, the publication is Journal of Physical Chemistry (1986), 90(9), 1921-4, database is CAplus.

Pulse radiolysis of trans-stilbene (St) in THF solution was carried out in the presence of quaternary ammonium salts, such as Bu₄NPF₆, Bu₄NI, Bu₄NBPh₄, CeMe₃NPF₆, PhMe₃NPF₆, and BzMe₃NPF₆ (Ce, cetyl). The absorption peak of the radical anions, St^–¡¤, was shifted to shorter wavelengths in the presence of the salts. The magnitude of the shift depended on the substituent groups of the quaternary ammonium cations. It is suggested that St^–¡¤ forms contact ion pairs with the quaternary ammonium cations. The decay rate of St^–¡¤ decreases with increasing salt concentration and becomes steady. The rate constants for the neutralization reaction of St^–¡¤ with the solvent counterions, THF(H⁺), were determined in the absence and presence of Bu₄NPF₆; in the latter case, the reaction occurs between the ion pairs St^–¡¤/Bu₄N⁺ and THF(H⁺)/PF₆^–. The results for other aromatic compounds such as biphenyl, anthracene, and pyrene are also presented. Comparison was made with the effect of NaBPh₄.

Journal of Physical Chemistry published new progress about 101079-29-2. 101079-29-2 belongs to catalysis-chemistry, auxiliary class Surfactants, name is N-hexadecyltrimethylammoniumhexafluorophosphate, and the molecular formula is C21H24O8, Synthetic Route of 101079-29-2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Yamamoto, Yukio published the artcilePulse radiolysis study of salt effects on reactions of aromatic radical cations with chloride: rate constants in the absence and presence of quaternary ammonium salts, Safety of N-hexadecyltrimethylammoniumhexafluorophosphate, the publication is Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases (1987), 83(6), 1795-804, database is CAplus.

The effect of quaternary ammonium salts on the decays of the radical cations of biphenyl, trans-stilbene, anthracene, and pyrene generated by pulse radiolysis in chlorohydrocarbons has been investigated. The decays, which are due to the neutralization reactions with Cl^–, are retarded by the addition of salts containing nonnucleophilic PF₆^–, BF₄^–, and ClO₄^–; the radical cations are rapidly quenched by salts containing I^– and BPh₄^–. The retarding effect of the salts is attributed to the formation of ion pairs between the reacting ions and the counter-ions from the salts. The rate constants for the neutralization reactions in 1,2-dichloroethane have been determined for the free-ion and ion-paired states; the latter state is attained by the addition of Bu₄NPF₆.

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases published new progress about 101079-29-2. 101079-29-2 belongs to catalysis-chemistry, auxiliary class Surfactants, name is N-hexadecyltrimethylammoniumhexafluorophosphate, and the molecular formula is C17H20ClN3, Safety of N-hexadecyltrimethylammoniumhexafluorophosphate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Won Kang, Hye published the artcileESR and NMR probes of counter-ion effects in perfluorosulfonate ionomer membranes, COA of Formula: C19H42F6NP, the publication is Journal of Membrane Science (1998), 148(2), 173-184, database is CAplus.

The properties of Nafion membranes, modified by exchange with tetraalkylammonium cations and equilibrated in methanol, were investigated using ESR spin probe techniques and ¹⁴N NMR spectroscopy. TEMPO and TEMPOL nitroxide radicals are shown to act as probes of the methanol solvent phase of the membranes. The mobility of the probe radicals is restricted, the correlation times for rotational diffusion being reduced by an order of magnitude within the ionomer environment compared to free methanol solution The larger tetraalkylammonium cations result in higher levels of swelling in methanol and a greater degree of nitroxide mobility. The temperature dependent ESR spectra show a gradual transition from freely diffusing to rigidly immobilized radicals as the temperature is lowered. The motion is completely frozen out at about 190 K, before the f.p. of methanol is reached. ¹⁴N NMR spectroscopy of the tetraalkylammonium counter-ions is also reported. The NMR signals for all cations remain quite sharp and well resolved in methanol-equilibrated Nafion. The corresponding ¹⁴N spin lattice relaxation times, T₁, were reduced by one order of magnitude compared to methanol solution The long-chain surfactant cations showed the least reduction in T₁ on incorporation into the membrane, consistent with retention of significant rotational mobility. These results are interpreted in terms of a much weaker ion clustering in the organically modified membranes than is found in strongly hydrated Nafion membranes.

Journal of Membrane Science published new progress about 101079-29-2. 101079-29-2 belongs to catalysis-chemistry, auxiliary class Surfactants, name is N-hexadecyltrimethylammoniumhexafluorophosphate, and the molecular formula is C23H43NP2, COA of Formula: C19H42F6NP.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia