Protonation Site in Organic Bases From Infrared X—h Deformation Modes

Cook, Denys

doi:10.1139/v64-336

Cited by 41 publications

(16 citation statements)

References 19 publications

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“…Such a band is attributable to the stretching vibrations of the protonated and strongly hydrogen bonded NH 3 + group. [11][12][13] (ii) The disappearance of the NH 2 scissor bending band at 1610 cm 21 and the appearance of two new bands at about 1545 cm 21 and 1640 cm 21 , due to the bending vibrations of the NH 3 + group, whose intensities increase with X NOA in the range 0 , X NOA , 0.5 (see Fig. 3).…”

Section: -10mentioning

confidence: 98%

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

2013

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Structural and dynamic features of bis(2-ethylhexyl) phosphoric acid (HDEHP)-n-octylamine (NOA) mixtures as a function of the NOA mole fraction (X NOA ) have been investigated by SAXS, WAXS, IR, dielectric spectroscopy and polarized optical microscopy. In the 0 ¡ X NOA , 0.5 range, mixtures are transparent liquids, while the abrupt formation of a waxy solid characterized by an hexagonal bidimensional structure occurs at X NOA = 0.5. Such a composition-induced phase transition results from the synergetic effect of the progressive increase in number density of ordered HDEHP-NOA nanodomains with X NOA . Mainly driven by an HDEHP to NOA proton transfer, the increase of structural order with X NOA arises from the progressive substitution of loosely hydrogen bonded HDEHP-HDEHP aggregates with strongly bonded NOA-HDEHP ones. Analysis of SAXS patterns at temperatures in the 10-70 uC range emphasized that these local structures are scarcely impacted by an increase of thermal fluctuations. Effects due to the steric compatibility between HDEHP and NOA apolar moieties have been highlighted. Overall, the results allow us to emphasize the role of specific polar and apolar interactions joined to steric effects in regulating the molecular organization in surfactant mixtures and can be used to design novel materials with planned physico-chemical properties.

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Section: -10mentioning

confidence: 98%

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

2013

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“…In addition, one can observe C–H stretching vibrations of the CH 2 groups around 3035 cm –1 and deformation vibrations around 1445 cm –1 , which corresponds to values reported for the isostructural Al compound. [6e] The solid‐state NMR spectroscopy results suggesting protonated amines are supported by the signals in the IR spectra in the range of 2250 to 2700 cm –1 , and an additional sharp signal at 1400 cm –1 (marked with *) . According to literature, broad bands for the protonated phosphonate groups involved in hydrogen bonding are observed around 2650 cm –1 .…”

Section: Resultsmentioning

confidence: 65%

Magnesium doped Gallium Phosphonates Ga_1–xMg_x[H_3+x(O₃PCH₂)₃N] (x = 0, 0.20) and the Influence on Proton Conductivity

Homburg

Tschense

Wolkersdoerfer

et al. 2017

Zeitschrift anorg allge chemie

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In our contribution to the development of new proton conductive coordination polymers (CPs) we focus on the impact of a partial replacement of Ga 3+ by Mg 2+ . This approach should come along with the introduction of additional protons due to charge balances. In a first step we have synthesized an isostructural compound to the literature known compound AlH 3 P3N [H 6 P3N = nitrilotris(methylene)triphosphonic acid], where Al 3+ is replaced by Ga 3+ , since all attempts to incorporate Mg 2+ ions directly into AlH 3 P3N were not successful. The relative amount of Mg 2+ and Ga 3+ was established by EDX analysis. Rietveld refinement of the synchrotron data located the Ga 3+ and Mg 2+ ions on a split position, proving the disordered incorporation of the Mg 2+ ions. Solid-state NMR spec-

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“…Meanwhile, there was no -NH bending vibration detected in the neat 3DMAP and 3DEAP due to the absence of -NH bond in the tertiary alkanolamine (3DMAP and 3DEAP). However, in the 3DMAPS spectrum, a new weak peak was observed at 1625.70 cm -1 and at 1626.18 cm -1 in 3DEAPS, which denotes the vibration peaks of protonated tertiary amine -NH + [17,18]. On top of that, the carboxylate anion (-COO -) was detected at 1377.408 and 1379.818 cm -1 in the spectrum of the 3DMAPS and 3DEAPS, respectively.…”

Section: Ftir Spectroscopymentioning

confidence: 92%

Salicylate-Based Protic Ionic Liquids as a Potential Antioxidant

2019

MJAS

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Salicylate-based protic ionic liquids (PILs) were synthesised, characterised and assessed in this study for potential antioxidant in drug design. The synthesised PILs were known as 3-dimethylamino-1-propanol salicylate (3DMAPS) and 3-diethylamino-1propanol salicylate (3DEAPS). Proton nuclear magnetic resonance ( 1 HNMR), Fourier transformation infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were used to characterise the synthesised PILs. Furthermore, the antioxidant activity of the synthesised PILs was determined using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical assay. Both 3DMAPS and 3DEAPS showed a good antioxidant activity compared to parent acid (salicylic acid) as these two compounds could scavenge 20% of DPPH free radical at a concentration of 66.76 ± 0.09 µM and 27.27 ± 0.10 µM, respectively. AbstrakCecair ionik protik (PILs) berasaskan salisilat disintesis, dicirikan dan dinilai untuk potensi antioksidan dalam reka bentuk dadah. Dua PILs iaitu 3-dimetilamino-1-propanol salisilat (3DMAPS) dan 3-diethilamino-1-propanol salisilat (3DEAPS) telah berjaya disintesis. Proton resonans magnetik nuklear ( 1 HNMR), spektroskopi transformasi inframerah (FTIR) dan analisis termogravimetrik (TGA) digunakan untuk pencirian PIL yang di sintesis. Tambahan pula, aktiviti antioksidan PIL ditentukan dengan menggunakan ujian radikal bebas 2,2-difenil-1-pikrilhidrazil (DPPH). Kedua-dua 3DMAPS dan 3DEAPS menunjukkan aktiviti antioksidan yang baik berbanding dengan asid induk (asid salisilat) kerana kedua-dua sebatian ini boleh membakar 20% radikal bebas DPPH masing-masing pada kepekatan 66.76 ± 0.09 μM dan 27.27 ± 0.10 μM.Kata kunci: cecair ionic protik, asid salisilik, perangkap radikal, radikal bebas, ujian DPPH

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Protonation Site in Organic Bases From Infrared X—h Deformation Modes

Cited by 41 publications

References 19 publications

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

Magnesium doped Gallium Phosphonates Ga_1–xMg_x[H_3+x(O₃PCH₂)₃N] (x = 0, 0.20) and the Influence on Proton Conductivity

Salicylate-Based Protic Ionic Liquids as a Potential Antioxidant

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Protonation Site in Organic Bases From Infrared X—h Deformation Modes

Cited by 41 publications

References 19 publications

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

Self-assembly in surfactant-based mixtures driven by acid–base reactions: bis(2-ethylhexyl) phosphoric acid–n-octylamine systems

Magnesium doped Gallium Phosphonates Ga1–xMgx[H3+x(O3PCH2)3N] (x = 0, 0.20) and the Influence on Proton Conductivity

Salicylate-Based Protic Ionic Liquids as a Potential Antioxidant

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Magnesium doped Gallium Phosphonates Ga_1–xMg_x[H_3+x(O₃PCH₂)₃N] (x = 0, 0.20) and the Influence on Proton Conductivity