Determination of pK a values of clinically important perfluorochemicals in nonaqueous media

Haklı, Özgül; Ertekin, Kadriye; Özer, Mehmet Sabih; Aycan, Şule

doi:10.1134/s1061934808110063

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…For example, the dielectric constant of (aprotic) 1-methylimidazole indicates it is a polar liquid, even if its value is frequency dependent (e.g., e = 21.5 at 5.8 GHz and 32.3 at 2.45 GHz). [123] Addition of HX (X = Cl À , Br À ) does not lead to sol- 14.5 [73] 25.9 [73] 1.99 [71] --17.2 [73] -CH 3 OH 1606.4 [c] 29.0 [1] À2.4 [74] 15.5 [1] -% 16.5 [30] --CH 3 [15] 12.3 [1] 23.51 [2] 4.75 [33] 10.3 [78] 9.52 [79] 13.5 [80] ClCH 2 CO 2 H 1408 [18] 9.00 [81] 18.8 [82] 2.81 [82] 8.3 [82] 7.8 [82] 10.1 [82] -C 6 H 5 CO 2 H 1400 [c] 11.0 [83] 20.7 [83] 4.2 [83] 10.25 [84] 9.4 [85] 12.3 [83] 4.20 [86] HCl 1396 [15] 1.8 [1] 8.9 [2] À8 [33] 2.08 [87] 1.23 [88] 3.55 [89] - -6.67 [91] 5.88 [91] 9.03 [91] -H 3 PO 4 1383 [33] --2.10…”

Section: Protic Molecules In Molecular Liquidsmentioning

confidence: 99%

Brønsted Acidity and the Medium: Fundamentals with a Focus on Ionic Liquids

2011

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Fundamental aspects of Brønsted acidity in ionic liquid systems, in relation to those of simple protic molecules in the gas phase, pure protic molecules in the condensed phase and solutions of protic molecules in molecular systems, are presented. The variety of acidities possible, beyond those observed in aqueous systems, is emphasised and discussed in terms of differences of solvent levelling, ionisation, dissociation, homo-/hetero-conjugate ion speciation and the stabilisation of proton-transfer products from solvent to solvent. It is argued that data regarding aqueous systems do not necessarily explain acid/base behaviour in other liquids satisfactorily. Methods of measuring acidity are reviewed, particularly by spectrophotometry and electrochemistry and recommendations proffered for estimating speciation and acidity of ionic liquids of various complexities.

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Section: Protic Molecules In Molecular Liquidsmentioning

confidence: 99%

Brønsted Acidity and the Medium: Fundamentals with a Focus on Ionic Liquids

2011

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“…So far, carnosine was studied through different methods because of its important roles in living organisms. These methods include high-performance liquid chromatography (HPLC) with different detectors (UV, fluorescent and amperometric) [9], liquid chromatography with mass spectrometry (LC-MS) [10], capillary electrophoresis (CE) [10], HPLC using an electrospray ionization mass spectrometry (ESI-MS) [10], microchip electrophoresis with chemiluminescence detection [11], capillary electrophoresis with laser induced fluorescence detection [12], potentiometry [13,14] and voltammetric methods [15][16][17][18]. Complexes of carnosine and metal cations were also investigated by cyclic voltammetry [19], spectroscopy (IR [19], ESR [19], NMR [19], UV/VIS [20], Raman [21]) and potentiometry [22].…”

Section: Introductionmentioning

confidence: 99%

Potentiometric, electrochemical and UV/VIS investigation of a copper (II) complex with β-alanyl-L-histidine

Medvidović‐Kosanović¹,

Stanković²,

Drulak³

et al. 2018

International Journal of Electrochemical Science

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The main goal of this study was to investigate complexation of L-carnosine and its constituent amino acids -alanine and L-histidine with copper (II) in a buffer at pH = 10. For this study the following methods were used: potentiometry, cyclic and differential pulse voltammetry and UV/VIS spectroscopy. The results have shown that L-histidine and L-carnosine formed a complex with copper in a 1:1 ratio, while no complexation with -alanine was observed.

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“…( 2 0 , 7 ) E t a n o l (Hakli et al, 2008) , b (Loeppert et al, 1979) Otoprotoliz sabiti dikkate alındığında, tert-butanol, etanol, DMF, aseton ve su ortamında bileşiklerin Hnp değerleri ve çözücülerin potansiyel aralıkları Çizelge 3. deki veriler ile kıyaslandığında zayıf asidik olduğu görülmüştür.…”

Section: Dielektrik Sabitiunclassified

Amfiprotik ve Dipolar Aprotik Çözücülerde 3-(4-Aril) Propiyonik Asit Türevlerinin Asitlik Kuvvetleri

Ocak

2020

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Beş adet 3-(4-aril) propiyonik asit türevinin asitlik özellikleri incelenmiştir. Bu çalışmada amfiprotik çözücülerden etanol, tert-butanol ve su, dipolaraprotik çözücülerden N,N dimetilformamid (DMF), aseton kullanılmıştır. Bileşikler tetrabutilamonyum hidroksidin (TBAH) metanoldeki çözeltisi ile titre edilmiş ve titrasyonlarda dönüm noktasının belirlenmesinde potansiyometrik metod, asitliğin belirlenmesinde yarı nötralizasyon metodu kullanılmıştır. Titrasyon eğrilerinin beklendiği gibi S şeklinde olduğu belirlenmiştir. Çizelge ve grafikler kullanılarak propiyonik asit türevlerinin amfiprotik ve dipolar aprotik çözücülerdeki asitlik kuvvetleri hesaplanmıştır. Çözücülerde elde edilen pKa değerlerinin farklandırıldığı görülmüştür. Bileşiklerin asitlik kuvvetlerine çözücü, moleküler yapı, otoprotoliz sabiti, dielektrik sabiti ve çözücünün seviyeleme-farklandırma etkileri tartışılmıştır.

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Determination of pK a values of clinically important perfluorochemicals in nonaqueous media

Cited by 14 publications

References 14 publications

Brønsted Acidity and the Medium: Fundamentals with a Focus on Ionic Liquids

Brønsted Acidity and the Medium: Fundamentals with a Focus on Ionic Liquids

Potentiometric, electrochemical and UV/VIS investigation of a copper (II) complex with β-alanyl-L-histidine

Amfiprotik ve Dipolar Aprotik Çözücülerde 3-(4-Aril) Propiyonik Asit Türevlerinin Asitlik Kuvvetleri

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