Contribution of NMR spectroscopy to the mechanistic understanding of photochromism
Along with classical UV-Visible spectroscopy allowing for the determination of intrinsic properties (λmax,ε), multinuclear NMR spectroscopy is a promising and useful tool for studying photochromic reactions. UV irradiation of the initial structure leads to the formation of photoproducts, which can b...
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| Format: | Article |
| Language: | English |
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Wiley
2004-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X04000194 |
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| author | S. Delbaere J. C. Micheau J. Berthet G. Vermeersch |
| author_facet | S. Delbaere J. C. Micheau J. Berthet G. Vermeersch |
| author_sort | S. Delbaere |
| collection | DOAJ |
| description | Along with classical UV-Visible spectroscopy allowing for the determination of intrinsic properties
(λmax,ε), multinuclear NMR spectroscopy is a promising and useful tool for studying photochromic
reactions. UV irradiation of the initial structure leads to the formation of photoproducts, which can be structurally
identified by 1D and 2D NMR experiments. The kinetics of thermal back reaction are monitored by
directly and separately measuring the concentrations of each long-living species at regular time intervals
in NMR spectra. A plausible reaction mechanism can therefore be proposed. Based on this mechanism, the
kinetic analysis and the study of the effects of temperature lead to the determination of the kinetic and
thermodynamic parameters (rate coefficients, enthalpy and entropy of activation) of the photochromic system
under investigation. This process has been applied to several photochromic families, spirooxazines and
benzo- and naphtho-pyrans. |
| format | Article |
| id | doaj-art-cc2306d90c144de598740bd4878ebedd |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2004-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-cc2306d90c144de598740bd4878ebedd2025-02-03T01:32:54ZengWileyInternational Journal of Photoenergy1110-662X2004-01-016415115810.1155/S1110662X04000194Contribution of NMR spectroscopy to the mechanistic understanding of photochromismS. Delbaere0J. C. Micheau1J. Berthet2G. Vermeersch3Laboratoire de Physique et LARMN, UMR CNRS 8009, Faculté de Pharmacie, Université de Lille 2, Lille F-59006, FranceLaboratoire IMRCP, UMR CNRS 5623, Université Paul Sabatier, Toulouse F-31062, FranceLaboratoire de Physique et LARMN, UMR CNRS 8009, Faculté de Pharmacie, Université de Lille 2, Lille F-59006, FranceLaboratoire de Physique et LARMN, UMR CNRS 8009, Faculté de Pharmacie, Université de Lille 2, Lille F-59006, FranceAlong with classical UV-Visible spectroscopy allowing for the determination of intrinsic properties (λmax,ε), multinuclear NMR spectroscopy is a promising and useful tool for studying photochromic reactions. UV irradiation of the initial structure leads to the formation of photoproducts, which can be structurally identified by 1D and 2D NMR experiments. The kinetics of thermal back reaction are monitored by directly and separately measuring the concentrations of each long-living species at regular time intervals in NMR spectra. A plausible reaction mechanism can therefore be proposed. Based on this mechanism, the kinetic analysis and the study of the effects of temperature lead to the determination of the kinetic and thermodynamic parameters (rate coefficients, enthalpy and entropy of activation) of the photochromic system under investigation. This process has been applied to several photochromic families, spirooxazines and benzo- and naphtho-pyrans.http://dx.doi.org/10.1155/S1110662X04000194 |
| spellingShingle | S. Delbaere J. C. Micheau J. Berthet G. Vermeersch Contribution of NMR spectroscopy to the mechanistic understanding of photochromism International Journal of Photoenergy |
| title | Contribution of NMR spectroscopy to the mechanistic understanding of photochromism |
| title_full | Contribution of NMR spectroscopy to the mechanistic understanding of photochromism |
| title_fullStr | Contribution of NMR spectroscopy to the mechanistic understanding of photochromism |
| title_full_unstemmed | Contribution of NMR spectroscopy to the mechanistic understanding of photochromism |
| title_short | Contribution of NMR spectroscopy to the mechanistic understanding of photochromism |
| title_sort | contribution of nmr spectroscopy to the mechanistic understanding of photochromism |
| url | http://dx.doi.org/10.1155/S1110662X04000194 |
| work_keys_str_mv | AT sdelbaere contributionofnmrspectroscopytothemechanisticunderstandingofphotochromism AT jcmicheau contributionofnmrspectroscopytothemechanisticunderstandingofphotochromism AT jberthet contributionofnmrspectroscopytothemechanisticunderstandingofphotochromism AT gvermeersch contributionofnmrspectroscopytothemechanisticunderstandingofphotochromism |