※ 引述《happysister (...)》之銘言： : 瘋狂讀讀看的無機 : 裡面在群論那一節有一題92中興 : Which of the following symmetry elements is the best criteria for chirality? : A inversion center : B mirror plane : C proper rotation axis : D improper rotation axis : 它寫答案是b : 可是對稱元素裡若有sigma或其他的非徵轉軸(i,Sn..)不就沒有光學了嗎?? : 一開始光學的定義不就是...In general,we can say that a molecule or some other : object is chiral if it has no symmetry operations(other than E)or if it has : only proper rotation axes. : 麻煩大家了...>"< 見 Huheey Optical active molecules must be dissymmetry Dissymmetry : molecule with no improper rotation axis 所以只要判斷有無 improper rotation axis 就可知道是否為光學活性 --

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