{"title":"The Importance of Hydrogen Bonded Networks in the Dynamic Heterogeneity of Deep Eutectic Solvents.","authors":"Allison Stettler, Gary A Baker, G J Blanchard","doi":"10.1021/acs.jpcb.5c02468","DOIUrl":null,"url":null,"abstract":"<p><p>We have examined the composition-dependent rotational diffusion dynamics of the chromophores perylene (neutral), oxazine 725 (cationic) and disodium fluorescein (anionic) in a series of choline chloride/1,3-propanediol (ChCl/PD) deep eutectic solvents (DESs). We find that the rotational diffusion dynamics of all chromophores do not correlate with the bulk viscosities of any of these ChCl/PD DES compositions, consistent with dynamic heterogeneity in all cases. Comparison with other DES systems─choline chloride/ethylene glycol (ChCl/EG) and choline chloride/glycerol (ChCl/Gly)─enables evaluation of the influence of hydrogen bond donor (HBD) structure and hydroxyl group density. This comparison highlights the critical role of hydrogen-bonded networks in these DESs and underscores the pivotal function of ChCl in disrupting these networks at ca. 15 mol % ChCl across all three DES systems. Taken collectively, these data point to the constituent structural factors that mediate the properties of DESs on local and bulk scales.</p>","PeriodicalId":60,"journal":{"name":"The Journal of Physical Chemistry B","volume":" ","pages":""},"PeriodicalIF":2.8000,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry B","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.jpcb.5c02468","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
We have examined the composition-dependent rotational diffusion dynamics of the chromophores perylene (neutral), oxazine 725 (cationic) and disodium fluorescein (anionic) in a series of choline chloride/1,3-propanediol (ChCl/PD) deep eutectic solvents (DESs). We find that the rotational diffusion dynamics of all chromophores do not correlate with the bulk viscosities of any of these ChCl/PD DES compositions, consistent with dynamic heterogeneity in all cases. Comparison with other DES systems─choline chloride/ethylene glycol (ChCl/EG) and choline chloride/glycerol (ChCl/Gly)─enables evaluation of the influence of hydrogen bond donor (HBD) structure and hydroxyl group density. This comparison highlights the critical role of hydrogen-bonded networks in these DESs and underscores the pivotal function of ChCl in disrupting these networks at ca. 15 mol % ChCl across all three DES systems. Taken collectively, these data point to the constituent structural factors that mediate the properties of DESs on local and bulk scales.
期刊介绍：
An essential criterion for acceptance of research articles in the journal is that they provide new physical insight. Please refer to the New Physical Insights virtual issue on what constitutes new physical insight. Manuscripts that are essentially reporting data or applications of data are, in general, not suitable for publication in JPC B.
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