a Unified Ph Scale for All Solvents: Part I – Intention and Reasoning

Radtke, Valentin; Stoica, Daniela; Leito, Ivo; Camões, Filomena; Krossing, Ingo; Anes, Bárbara; Roziková, Matilda; Deleebeeck, Lisa; Veltzé, Sune; Näykki, Teemu; Bastkowski, Frank; Heering, Agnes; Dániel, Nagy; Quendera, Raquel; Liv, Lokman; Uysal, Emrah; Lawrence, Nathan S.

doi:10.1515/iupac.93.0258

Cited by 2 publications

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“…Also, due to the change in activity coefficients and liquid junction potentials in the presence of non-aqueous solvents, the pH values in different solvent mixtures should be treated as trends rather than absolute values. [60][61][62] If absolute pH values across different solvent compositions are required, they can be obtained following the procedures by Radtke and Heering et al 63,64 We used MD simulations to understand the impact of different solvent ratios in water-DMSO mixtures on the reversibility of the proton transfer to spiropyran (ring-closed form that is reached in the metastable state, Scheme 1). The structure can be analyzed through the calculation of radial distribution functions, which measure the probability of finding atoms at a particular distance around a central reference atom, and from which coordination numbers can be derived.…”

Section: Photo-switching Behavior Of Merocyanine Photoacid In Water-d...mentioning

confidence: 99%

Durable Light-Driven pH Switch for CO2 Capture/Release Enabled by Tuning Solvation Environment of Photoacids

de Vries,

Goloviznina,

Reiter

et al. 2023

Preprint

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Photoacids are organic molecules that release protons under illumination, providing spatiotemporal control of pH. Such light-driven pH switches offer the ability to cyclically alter the pH of the medium and are highly attractive for a wide variety of applications, including CO2 capture. Although photoacids such as protonated merocyanine can enable fully reversible pH cycling in water, they have a limited chemical stability against hydrolysis (<24 hours). Moreover, these photoacids have low solubility and provide only a small pH-jump. In this work we introduce a simple pathway to dramatically increase stability and solubility of photoacids by tuning their solvation environment in binary solvent mixtures. We show that a preferential solvation of merocyanine by aprotic solvent molecules results in a 60% increase in pH modulation magnitude when compared to the behavior in pure water and can withstand stable cycling for > 350 hours. Our results suggest that a very high stability of merocyanine photoacids can be achieved in the right solvent mixtures, offering a way to bypass complex structural modifications of photoacid molecules and serving as the key milestone towards their application in a photo-driven CO2 capture process.

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Section: Photo-switching Behavior Of Merocyanine Photoacid In Water-d...mentioning

confidence: 99%

Durable Light-Driven pH Switch for CO2 Capture/Release Enabled by Tuning Solvation Environment of Photoacids

de Vries,

Goloviznina,

Reiter

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In the present paper, several methods of measuring the acidity of water-ethanol mixtures are demonstrated and their strengths and weaknesses evaluated. These methods include: (1) the use of a commercial combination pH electrodes (aqueous KCl-based filling solution) in combination with a commercial pH meter, (2) differential potentiometry (reference method) for

measurements using a specialized (solid-contact) glass electrode half-cell and an ILSB [ 40 ], and (3) a new combination between a glass electrode (GE) half-cell and a Ag/AgCl reference electrode with an IL filling solution.…”

Section: Introductionmentioning

confidence: 99%