O-nitrophenyl octyl ether

Galland, A., Girault, H., Testa, B., Carrupt, P. A. Solvatochromic analysis of partition coefficients in the o-nitrophenyl octyl ether (o-NPOE)/water system. Helv. Chim. Acta 2003, 86, 3533-3547. 

Quinn et al. studied ET at micro-ITIES supported by micropipettes or microholes [16]. The studied systems involved ferri/ferrocyanide redox couple in aqueous phase and ferrocene, dimethylferrocene, or TCNQ in either DCE or o-nitrophenyl octyl ether. Sigmoidal, steady-state voltammograms were obtained for ET at the water-DCE interface supported at a micropipette. The semilogarithmic plot of E versus log[(/(j — /)//] was... 

FIG. 9 Differential capacity C of the interface between 0.1 M LiCl in water and 0.02 M tetrabu-tylammonium tetraphenylborate ( ) or tetrapentylammonium tetrakis[3,5-bis(trifluoromethyl)phe-nyl]borate ( ) in o-nitrophenyl octyl ether as a function of the interfacial potential difference (From Ref 73.)... 

The LFER approach of Abraham was the most powerful method to predict partition coefficients in varied experimental conditions (for example, see [68-72]). In particular, since 1,2-dichloroethane and o-nitrophenyl octyl ether are good experimental substitutes for alkane, in silico tools were developed with LFER equations to predict log Pdce [73] or log Pnpoe [74, 75]. 

In the same way, o-nitrophenyl octyl ether (o-NPOE) was immobilized on polycarbonate (PC) filters and the apparent permeability measured after 5 h incubation time was correlated to log Pnpoe for a series of reference compounds (log Pnpoe ranging from —1 to 3.6) [90]. Lipophilicity values in the alkane/water system were also determined using PAMPA with hexadecane-PC coated filters [89]. In this case, a correlation was found between intrinsic permeability (log Pq, permeability corrected for ionization and for unstirred water layer contribution, which particularly affects permeability of lipophilic compounds) and log P ik. However, log Pq is obtained from the knowledge of the pJC, value(s) and the permeability pH profile and therefore requires the full permeability pH profile to be measured for each compound, which negatively impacts the assay throughput. 

Liu, X., Bouchard, G., Girault, H.H., Testa, B. and Carrupt, P.A. (2003) Partition coefficients of ionizable compounds in o-nitrophenyl octyl ether/ water measured by the potentiometric method. Analytical Chemistry, 75, 7036-7039. 

Characterisation of the water/ o-nitrophenyl octyl ether system in terms of the partition of nonelectrolytes and of ions. Physical Chemistry Chemical Physics, 7, 2418-2422. 

Fig. 6. Transport selectivity and potentiometric selectivity of a Ca2 selective neutral carrier membrane (3 wt.% carrier 10, 65 wt.% o-nitrophenyl-octyl ether, 32wt.% polyvinyl chloride). Experimental selectivity coefficients KCaNa obtained with (16) and (18), respectively, as a function of the cationic concentration m (in moles/liter).

Fig. 8. Experimental current-voltage curves of a solvent polymeric membrane containing the neutral carrier 10 (3wt.% carrier 10, 65wt.% o-nitrophenyl-octyl ether, 32wt.% polyvinyl chloride, thickness of membrane approximately 100/urn, 25°C). The membrane was in contact with aqueous CaCI2-soIutions of the molarity indicated.55...

A quantitative investigation performed using the HPLC/DAD (Diode Array Detector) technique showed that the amount of degraded octMC-6 was quite high. In contact with 3 mol L 1 nitric acid, the proportion of degradation after an irradiation of 1 MGy was estimated to be 33% in o-nitrophenyl octyl ether (NPOE) and 88% in dodecane. The quantity of octMC6-N02 reached 50% of degradation products (72). 

DOS dioctyl sebacate, BBPA bis(l-butylpentyl) adipate, DOP dioctyl phthalate, o-NPOE o-nitrophenyl octyl ether. 

A micropipet H ion-selective electrode similar to the NH4 electrode in Box 15-2 was constructed to measure the pH inside large, live cells by impaling a cell with the electrode (and with a similarly small reference electrode). The ion exchanger at the tip of the H ion-selective electrode was made from 10 wt% tri(dodecyl)amine [(Ci2H25)3N] and 0.7 wt% sodium tetraphenylborate, dissolved in o-nitrophenyl octyl ether. The selectivity for H" relative to Na, K", Mg ", and Ca " was sufficient for intra- and extracellular measurements without significant interference from these metal ions. Explain how this electrode works. 

A hydrophobic microfikration membrane with a thickness of 100 pm, a surface porosity of 65% and a tortuosity t = 2.1 is filled with o-nitrophenyl octyl ether (o-NPOE) and separates two aqueous solutions, a feed solution with either a potassium perchlorate (KCIO4) or a sodium perchlorate (NaC104) solution and a permeate or strip... 

The PVC-based sensor membranes were prepared according the conventional procedure. The membrane components are as follows PVC (33 wt %), plasticizer bis(2-ethylhexyl) sebacate (DOS) or o-nitrophenyl octyl ether (o-NPOE) (66 wt %), and manganese(III)-tetraphenylporphyrin chloride (MnTPPCl) (1 wt %) were dissolved in freshly distilled tetrahydrofuran (THF). After 15 min of stirring, the cocktail was poured into a Petri dish. 

Selective separation of lead(II) and cadmium(II) chloride complexes by both liquid membranes containing liquid anion-exchangers as mobile carriers and solid polymeric membranes with anion-exchange sites as fixed carriers is described by Hayashita in Chapter 21. A novel polymeric plasticizer membrane, which is composed of cellulose triacetate polymer as a membrane support, o-nitrophenyl octyl ether as a membrane plasticizer, and trioctylmethylammonium chloride as an anion-exchange carrier, provides enhanced permeation selectivity and efficiency. 

Solvent characteristics that influence the stability of the membrane are surface tension and water solubility (72). Processes that destabilize liquid membranes are the loss of membrane material due to osmotic (77) or hydrostatic (72) pressure differences over the membrane, formation of emulsions, or formation of inverted micelles. A frequently used organic membrane solvent is o-nitrophenyl octyl ether (NPOE). It has a low viscosity, high lipophilicity and a high polarity. Other solvents used are phenylcyclohexane, decanol, and diphenylether. 

Co-transport of Monovalent Ions as Free Ions. Frequently used polar solvents in supported liquid membranes are o-nitrophenyl octyl ether (NPOE, r=24), o-nitrodiphenyl ether ( PE, e=30) and 2-fluorodiphenyl ether (FNDPE, er=50). When the complex concentration in the membrane phase is low, the complex and anion are solvent separated and Equilibrium 14 is obtained. 

Sales et al. (2001) developed a potentiometric sensor for the determination of tartaric acid. Tartrate-sensitive electrodes were constructed, comprising poly(vinyl chloride) membranes. Various membrane compositions were evaluated and the one combining an ionic sensor (bis(triphenylphosphoranylidene)ammonium chloride), 4-ferf-octylphenol, and o-nitrophenyl octyl ether was selected. The analytical characteristics of this electrode were evaluated using a single-line flow injection manifold. The accuracy of the developed method was demonstrated for the determination of tartaric acid in red and white wine samples. 

Poly(vinyl chloride) (PVC) with an average polymerization degree of 1100 was purified by reprecipitation from THF in methanol. The plasticizers or membrane solvents, di-n-octylphthalate (DOP), o-nitrophenyl octyl ether (NPOE), and 2-fluorophenyl-2-nitrophenyl ether (FPNPE) were obtained from Dojindo Laboratories. The lipophilic salt, sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaTFPB), was obtained from Tokyo Chemical Industry Co., Ltd. and Dojindo Laboratories. 

Xie, S., Meng, X., Liang, Z., Li, B., Chen, Z., Zhu, Z., Li, M., Shao, Y. Kinetics of heterogeneous electron transfer reactions at the externally polarized water/o-nitrophenyl octyl ether interface. J. Phys. Chem. C 2008,112,18117-18124. 

Penicillin G Removal and Recovery We have developed an SLM system with strip dispersion effective at the low feed pH of about 3 for peniciUin G removal and recovery from aqueous solutions (Ho, 2002b, 2003). The organic membrane solution in the strip dispersion consisted of 10 wt% A-lauryl-A-trialkylmethylamine with a molecular weight of 372 (a total number of 25.3 carbon atoms per amine molecule, e.g., Amberlite LA-2), 1 wt% o-nitrophenyl octyl ether (o-NPOE), and 89 wt% Isopar L (described earlier). The aqueous strip solution was 1.2 M sodium carbonate (NaaCOa). 

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