1993 Fiscal Year Final Research Report Summary
DEVELOPMENT OF METHODS FOR QUANTITATIVE RATING OF LEWIS ACIDITY OF METAL IONS IN HYDROPHOBIC SOLUTION PHASES
Project/Area Number |
04650757
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
有機工業化学
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Research Institution | KYUSHU UNIVERSITY |
Principal Investigator |
KOBAYASHI Hiroshi KYUSHU UNIVERSITY, INSTITUTE OF ADVANCED MATERIAL STUDY ; PROFESSOR, 機能物質科学研究所, 教授 (10037731)
|
Co-Investigator(Kenkyū-buntansha) |
SONODA Takaaki KYUSHU UNIVERSITY, INSTITUTE OF ADVANCED MATERIAL STUDY ; ASSOCIATE PROFESSOR, 機能物質科学研究所, 助教授 (90108770)
|
Project Period (FY) |
1992 – 1993
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Keywords | Lewis acidity / Alkali metal ion / Perfluoroalkyl effect / Lipophilic metal salt / Halochromism / Triphenylmethyl cation / Spiropyran / Azobenzene |
Research Abstract |
1. On purpose to incorporate alkali metal ion in a desolvated form into a hydrophobic solution phase, highly lipophilic and bulky perfluoroalkyl-substituted stable tetraphenylboron-ate complex were synthesized. Fluorine-substituent effects were evaluated in terms of their solubilities and decomposition rate constants in acid media. 2. Alkali metal salts of the lipophilic borate act as Lewis acid in CH_2Cl_2 to cleave (1) the C-Cl bond of triphenylmethyl chloride, giving triphenylmethyl cation and (2) the C-O bond of 1, 1, 3-trimethylspiro[indoline-2, 3'-[6]-naphtho-[2,1-b]pyrans], giving a corresponding merocyanine, accompanying color-developing. Lewis acidity of alkali metal ion was rated by the extent of induced spectroscopic shift and was discussed in terms of the ionic charge and radius. 3. Halochromic shifts induced by alkali metal salts of the lipophilic borate on 2,4,4', 6-tetramethoxyazobenzene in CH_2Cl_2 were correlated well with Lewis acidity of metal ion described above. 4. Halochromic shift induced by alkali metal salts of the lipophilic borate on 2,6-diphenyl-4-(2,4,6-triphenylpyridino)phenolate betaine was rapid rate process and difficult to be used as a measure of Lewis acidity of metal ion. 5. The observed spectroscopic shift was affected by the presence of nimute water in different manner from a solvent to another. The water concentration is, therefore, required to be precisely controlled for the quantitative rating of Lewis acidity of metal ion in a hydrophobic solution phase.
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Research Products
(10 results)