アキヤマ ヨシカツ   AKIYAMA Yoshikatsu
  秋山 義勝
   所属   研究施設 研究施設
   職種   講師
論文種別 原著
言語種別 英語
査読の有無 査読あり
表題 Sol–gel derived organic–inorganic composites recognizing molecular asymmetry
掲載誌名 正式名:Supramolecular Science
ISSNコード:0968-5677
掲載区分国外
出版社 Elsevier
巻・号・頁 5(3-4),433-437頁
著者・共著者 MIZUKAMI Fujio, AKIYAMA Yoshikatsu, IZUTSU Hiroyuki
発行年月 1998
概要 A new type of optically active organic-inorganic composite was prepared by a sol–gel method in which tetraethoxysilane (TEOS) is hydrolyzed in the presence of an optically active organic compound (d-lactose, d-glucose, d-sorbitol, d-fructose, l-tartaric acid, l-malic acid, or l-mandelic acid). Optical resolution of tris(pentane-2,4-dionato)metal complexes was performed by using the new sol–gel derived composites, composites prepared by conventional techniques (kneading with l-lactose, l-fructose or l-tartaric acid, and impregnation with an l-lactose, l-fructose or l-tartaric acid solution) and the optically active organic compounds themselves. The sol–gel derived composites showed much higher optical resolution abilities than the composites prepared by conventional techniques. In addition, the optically active organic compounds could not resolve the racemate into the enantiomers under similar conditions. X-ray diffraction and NMR results disclosed that an optically active organic compound in the sol–gel derived composite is highly dispersed, most likely, because it bonds to silicon atoms. Thus, it was deduced that optically active molecules dispersed at a molecular level recognize the chirality of the metal chelate compound. The high-resolution ability of the sol–gel derived composites arises from the combined effect of the silica support (adsorbing power) and the highly dispersed molecules (chiral recognition power).
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