A composition contains one or more compounds represented by general formula (i) and one or more compounds represented by general formula (ii), where a content of the compounds represented by general formula (i) is 5% to 30% and a content of the compounds represented by general formula (ii) is 5% to 25%:
(In the formulae, Ri1, Ri2, and Rii1 each independently represent an alkyl group having 1 to 8 carbon atoms where one -CH2- or two or more non-adjacent -CH2- in the alkyl group may each independently be substituted with -CH=CH-, - C≡C-, -O-, -CO-, -COO-, or -OCO-, Xi1 to Xi6 each independently represent a hydrogen atom or a fluorine atom, and Xii1 represents a hydrogen atom, a fluorine atom, or a chlorine atom.)
一种组合物含有一种或多种通式(i)代表的化合物和一种或多种通式(ii)代表的化合物,其中通式(i)代表的化合物含量为 5%至 30%,通式(ii)代表的化合物含量为 5%至 25%:
(式中,Ri1、Ri2和Rii1各自独立地代表具有1至8个碳原子的烷基,其中烷基中的一个-
CH2-或两个或两个以上不相邻的- -可各自独立地被-CH=CH-、-C≡C-、-O-、-CO-、-COO-或-OCO-取代,Xi1至Xi6各自独立地代表氢原子或
氟原子,Xii1代表氢原子、
氟原子或
氯原子。)