دورية أكاديمية
Quantitative evaluation of Lewis acidity of metal ions with different ligands and counterions in relation to the promoting effects of Lewis acids on electron transfer reduction of oxygen.
| العنوان: | Quantitative evaluation of Lewis acidity of metal ions with different ligands and counterions in relation to the promoting effects of Lewis acids on electron transfer reduction of oxygen. |
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| المؤلفون: | Ohkubo K; Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST Science and Technology Corporation, Suita, Osaka 565-0871, Japan., Menon SC, Orita A, Otera J, Fukuzumi S |
| المصدر: | The Journal of organic chemistry [J Org Chem] 2003 Jun 13; Vol. 68 (12), pp. 4720-6. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Chemical Society Country of Publication: United States NLM ID: 2985193R Publication Model: Print Cited Medium: Print ISSN: 0022-3263 (Print) Linking ISSN: 00223263 NLM ISO Abbreviation: J Org Chem Subsets: PubMed not MEDLINE |
| أسماء مطبوعة: | Publication: Columbus Oh : American Chemical Society Original Publication: Easton, Pa. [etc.] |
| مستخلص: | The g(zz) values of ESR spectra of superoxide (O(2)(.-) complexes of metal ion salts acting as Lewis acids with different ligands and counterions were determined in acetonitrile at 143 K. The binding energies (DeltaE) of (O(2)(.-)/Lewis acid complexes have been evaluated from deviation of the g(zz) values from the free spin value. The DeltaE value is quite sensitive to the difference in the counterions and ligands of metal ion salts acting as Lewis acids. On the other hand, the fluorescence maxima of the singlet excited states of 10-methylacridone/Lewis acid complexes are red-shifted as compared with that of 10-methylacridone, and the relative emission energies (Deltahnu(f)) vary significantly depending on the Lewis acidity of metal ion salts with different counterions and ligands. The promoting effects of Lewis acids were also examined on electron transfer from cobalt(II) tetraphenylporphyrin to oxygen in acetonitrile at 298 K, which does not occur in the absence of Lewis acids under otherwise the same experimental conditions. Both DeltaE and Deltahnu(f) values are well correlated with the promoting effects of Lewis acids on the electron transfer reduction of oxygen. Such correlations indicate that DeltaE and Deltahnu(f) values can be used as quantitative measures of Lewis acidity of metal ion salts with different ligands and counterions. The Lewis acidity thus determined can also be applied to predict the promoting effects of Lewis acids on organic synthesis. |
| تواريخ الأحداث: | Date Created: 20030607 Date Completed: 20040128 Latest Revision: 20030606 |
| رمز التحديث: | 20231215 |
| DOI: | 10.1021/jo034258u |
| PMID: | 12790575 |
| قاعدة البيانات: | MEDLINE |
Find this issue from the American Chemical Society | تدمد: | 0022-3263 |
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| DOI: | 10.1021/jo034258u |