For example, the specific rotation of sucrose at 20°C for the sodium D line is expressed as = 66.5°. (2) The amount obtained by multiplying the specific rotation [α] λ t by the molecular weight M of an optically active substance is called the molecular rotation power, or molar rotation power, and is the angle of rotation shown by a 1 m liquid layer of a solution containing 1 mol of an optically active substance in 1000 cc of solution, and is a convenient amount for comparing the inherent optical rotation of molecules. (3) The optical rotation of a crystal is usually expressed as the angle of rotation for a layer 1 mm thick. *Some of the terminology that refers to "molecular rotational power" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…たとえば20℃におけるショ糖のナトリウムD線に対する比旋光度は=66.5゜として示す。(2)比旋光度[α]λtに光学活性物質の分子量Mをかけた量は分子旋光度molecular rotatory power,またはモル旋光度molar rotatory powerといい,溶液1000cc中に旋光性物質を1mol含む溶液が1mの液層に示す旋光角であり,分子固有の旋光度を比較するのに便利な量である。(3)結晶の旋光度は,ふつう1mmの厚さの層についての旋光角で表す。… ※「molecular rotatory power」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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