Criteria for standardization of pH measurements in organic solvents and water + organic solvent mixtures of moderate to high permittivities

Mussini, T.; Covington, A. K.; Longhi, P.; Rondinini, Sandra

doi:10.1351/pac198557060865

Cited by 191 publications

(86 citation statements)

References 10 publications

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“…Electrode reversible RVS buffer (m5) + KX (taX) Electrode reversible (1) to H in solvent a in solvent a to X in solvent a which for most aquo-organic mixed solvents (and also for several 100%-pure nonaqueous solvents) a takes the simpler and familiar form:…”

Section: Introductionmentioning

confidence: 99%

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Reference value standards and primary standards for pH measurements in organic solvents and water + organic solvent mixtures of moderate to high permittivities

Rondinini¹,

Mussini²,

Mussini³

1987

Pure and Applied Chemistry

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170

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Section: Introductionmentioning

confidence: 99%

“…1), to obtain Is , I and ultimately 1Cl and (iv) the ion-size parameter a0 is assigned a value fixed by the Bates-Guggenheim convention extended to the general solvent s (refs . 1 , 2):…”

Section: Introductionmentioning

confidence: 99%

Reference value standards and primary standards for pH measurements in organic solvents and water + organic solvent mixtures of moderate to high permittivities

Rondinini¹,

Mussini²,

Mussini³

1987

Pure and Applied Chemistry

Self Cite

170

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“…-2log (MSH/M°) (16) where p is the density of solvent SH in kg/dm3 , p°= 1 Systematising the matter is long overdue , and one does hope that the present growing interest in this field, and the availability of established, sound methods of determination, may lead to the necessary rapid acquisition and analysis of the relevant PKap data.…”

Section: Presentation Of Data and Discussionmentioning

confidence: 99%

“…a binary aqueous-organic solvent mixture SH = H20 + ZH, cf. equations (5) to (8)) capable of being both a proton donor and a proton acceptor can undergo autoprotolysis according to the general process: SH+SH=SH+S (1) The auto-ionisation of water: H20 + H20 = H3O + OH (2) is the best known example of such behaviour.…”

Section: Introductionmentioning

confidence: 99%

Autoprotolysis constants in nonaqueous solvents and aqueous organic solvent mixtures

Rondinini¹,

Longhi²,

Mussini³

et al. 1987

Pure and Applied Chemistry

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114

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“…The values were corrected for solvent effects by subtracting 0.26 from the measured pH. The correction term was determined from a master curve obtained by measuring the pH of a set of standard solutions (32)(33)(34)(35).…”

Section: ' H Nmrmentioning

confidence: 99%

Light-induced change of the molecular charge in a spironaphthoxazine compound

Rys¹,

Weber²,

Wu³

1993

Can. J. Chem.

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En l'absence de lumikre UV, il s'ktablit un tquilibre acide-base entre la forme spiro et une forme protonee fermke. Par irradiation dans des conditions acides approprites, on peut transformer la forme spiro en une forme cationique ouverte par le biais de la forme merocyanine. I1 s'ttablit un Cquilibre acide-base entre les deux formes ouvertes. A l'exception de la forme protonte fermCe, on a confirme les structures par RMN. Faisant appel 2i la photolyse eclair, on a CtudiC la cinetique de la reaction thermique de fermeture de cycle des deux formes. I1 est dernontre que la reaction de fermeture de cycle se produit uniquement par le biais de la forrne merocyanine. Les valeurs de pK, dCterminees pour les deux equilibres, fournissent les valeurs de pH dans lesquelles le changement de charge moltculaire induit par la lumikre se produit.[Traduit par la redaction] Introduction Recently, the photochromic behaviour of indolinospirooxazine derivatives has been intensively investigated (1-6). This is mainly due to their rapid photoresponsive change of the molecular structure and the better photodurability as compared to the indolinospiropyran derivatives. The photochromism and the acid-base behaviour of indolinospiro compounds is summarized in Scheme 1.By UV irradiation the C-0 bond of the colourless spiroform A is cleaved and the coloured merocyanine form B is formed. The reverse reaction proceeds thermally or photochemically (5-1 1). In the case of spiropyran derivatives it has been established (12-18) that the zwitterionic B-form can be protonated to the cationic C-form. The same is expected for spirooxazine compounds.Due to the different electronic structures and molecular geometries of the A-, the B-, and the C-forms, their physical and chemical properties, such as colour, polarity, charge, and their acidity and basicity are also different. The possibilitv to switch between the various forms and thus the var-

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Criteria for standardization of pH measurements in organic solvents and water + organic solvent mixtures of moderate to high permittivities

Abstract: Abstract

Cited by 191 publications

References 10 publications

Reference value standards and primary standards for pH measurements in organic solvents and water + organic solvent mixtures of moderate to high permittivities

Reference value standards and primary standards for pH measurements in organic solvents and water + organic solvent mixtures of moderate to high permittivities

Autoprotolysis constants in nonaqueous solvents and aqueous organic solvent mixtures

Light-induced change of the molecular charge in a spironaphthoxazine compound

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