NMR Studies of the Equilibria and Reaction Rates in Aqueous Solutions of Formaldehyde
Formaldehyde has an important role in the chemical industry and in biological sciences. In dilute aqueous solutions of formaldehyde only traces of the molecular formaldehyde are present and the predominant species are methylene glycol and in lower concentrations, dimethylene glycol. The chemical equ...
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| Veröffentlicht in: | The journal of physical chemistry. B 2015-03, Vol.119 (12), p.4479-4487 |
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| container_title | The journal of physical chemistry. B |
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| creator | Rivlin, Michal Eliav, Uzi Navon, Gil |
| description | Formaldehyde has an important role in the chemical industry and in biological sciences. In dilute aqueous solutions of formaldehyde only traces of the molecular formaldehyde are present and the predominant species are methylene glycol and in lower concentrations, dimethylene glycol. The chemical equilibria and reaction rates of the hydration of formaldehyde in H2O and D2O solutions at low concentrations were studied by 1H and 13C NMR at various conditions of pH (1.8–7.8) and temperature (278–333 K). These measurements became possible by direct detection of formaldehyde 13C and 1H peaks. The equilibrium and rate constants of the dimerization reaction of methylene glycol were also measured. The rate constants for both the hydration and the dimerization reactions were measured by a new version of the conventional selective inversion transfer method. This study, together with previous published work, completes the description of dynamics and equilibria of all the processes occurring in dilute aqueous formaldehyde solutions. |
| doi_str_mv | 10.1021/jp513020y |
| format | Article |
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In dilute aqueous solutions of formaldehyde only traces of the molecular formaldehyde are present and the predominant species are methylene glycol and in lower concentrations, dimethylene glycol. The chemical equilibria and reaction rates of the hydration of formaldehyde in H2O and D2O solutions at low concentrations were studied by 1H and 13C NMR at various conditions of pH (1.8–7.8) and temperature (278–333 K). These measurements became possible by direct detection of formaldehyde 13C and 1H peaks. The equilibrium and rate constants of the dimerization reaction of methylene glycol were also measured. The rate constants for both the hydration and the dimerization reactions were measured by a new version of the conventional selective inversion transfer method. This study, together with previous published work, completes the description of dynamics and equilibria of all the processes occurring in dilute aqueous formaldehyde solutions.</description><identifier>ISSN: 1520-6106</identifier><identifier>EISSN: 1520-5207</identifier><identifier>DOI: 10.1021/jp513020y</identifier><identifier>PMID: 25742498</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>Aqueous solutions ; Carbon-13 Magnetic Resonance Spectroscopy ; Deuterium Oxide - chemistry ; Dilution ; Dimerization ; Formaldehyde ; Formaldehyde - chemistry ; Glycols ; Hydration ; Hydrogen-Ion Concentration ; Methanol - analogs & derivatives ; Methanol - chemistry ; Methylene ; Proton Magnetic Resonance Spectroscopy ; Rate constants ; Solutions ; Temperature ; Water - chemistry</subject><ispartof>The journal of physical chemistry. 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This study, together with previous published work, completes the description of dynamics and equilibria of all the processes occurring in dilute aqueous formaldehyde solutions.</description><subject>Aqueous solutions</subject><subject>Carbon-13 Magnetic Resonance Spectroscopy</subject><subject>Deuterium Oxide - chemistry</subject><subject>Dilution</subject><subject>Dimerization</subject><subject>Formaldehyde</subject><subject>Formaldehyde - chemistry</subject><subject>Glycols</subject><subject>Hydration</subject><subject>Hydrogen-Ion Concentration</subject><subject>Methanol - analogs & derivatives</subject><subject>Methanol - chemistry</subject><subject>Methylene</subject><subject>Proton Magnetic Resonance Spectroscopy</subject><subject>Rate constants</subject><subject>Solutions</subject><subject>Temperature</subject><subject>Water - chemistry</subject><issn>1520-6106</issn><issn>1520-5207</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkDFPwzAQhS0EoqUw8AeQFyQYCmc7sZOxqlpAKiC1dI6c2FZdJXEbJ0P_PS4tnZAYTnfSfff07iF0S-CJACXP601MGFDYnaE-iSkMQ4nz48wJ8B668n4NQGOa8EvUo7GIaJQmfbT8eJ_jRdspqz12BrcrjSfbzpY2b6zEslZ4rmXRWlfjuWwDZGs82nbadR4vXNntNz-XU9dUslR6tVP6Gl0YWXp9c-wDtJxOvsavw9nny9t4NBtKFiXtMCE0koqByRNItSpiCRGBNGdckIQwzoJjljBtTCoEUzEYIsNLjFIwMQjDBujhoLtpXPDk26yyvtBlKeu9wYwIToFTmtL_Uc5FMEUiHtDHA1o0zvtGm2zT2Eo2u4xAtg88OwUe2LujbJdXWp3I34QDcH8AZOGzteuaOgTyh9A3-B6EcQ</recordid><startdate>20150326</startdate><enddate>20150326</enddate><creator>Rivlin, Michal</creator><creator>Eliav, Uzi</creator><creator>Navon, Gil</creator><general>American Chemical Society</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20150326</creationdate><title>NMR Studies of the Equilibria and Reaction Rates in Aqueous Solutions of Formaldehyde</title><author>Rivlin, Michal ; Eliav, Uzi ; Navon, Gil</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a348t-8124ad30fb809edc5a04109b367181363002383eff9773d50f1a5203220f507f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Aqueous solutions</topic><topic>Carbon-13 Magnetic Resonance Spectroscopy</topic><topic>Deuterium Oxide - chemistry</topic><topic>Dilution</topic><topic>Dimerization</topic><topic>Formaldehyde</topic><topic>Formaldehyde - chemistry</topic><topic>Glycols</topic><topic>Hydration</topic><topic>Hydrogen-Ion Concentration</topic><topic>Methanol - analogs & derivatives</topic><topic>Methanol - chemistry</topic><topic>Methylene</topic><topic>Proton Magnetic Resonance Spectroscopy</topic><topic>Rate constants</topic><topic>Solutions</topic><topic>Temperature</topic><topic>Water - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rivlin, Michal</creatorcontrib><creatorcontrib>Eliav, Uzi</creatorcontrib><creatorcontrib>Navon, Gil</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>The journal of physical chemistry. 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| subjects | Aqueous solutions Carbon-13 Magnetic Resonance Spectroscopy Deuterium Oxide - chemistry Dilution Dimerization Formaldehyde Formaldehyde - chemistry Glycols Hydration Hydrogen-Ion Concentration Methanol - analogs & derivatives Methanol - chemistry Methylene Proton Magnetic Resonance Spectroscopy Rate constants Solutions Temperature Water - chemistry |
| title | NMR Studies of the Equilibria and Reaction Rates in Aqueous Solutions of Formaldehyde |
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