摘要
利用气质联用对3类6个系列共15种负性含氟液晶化合物进行了电子轰击源(EI)质谱分析,总结了3类负性含氟液晶化合物的质谱裂解规律,并阐述了某些化合物的质谱裂解途径。其中,烷基双环己烷二氟取代苯甲醚液晶化合物的特征离子主要是为环己烷取代基开环的裂解碎片,其m/z主要为226、183、157等;烷基环己基烷氧基三氟取代联苯液晶化合物的特征碎片为环己烷开环碎片及氟取代苯环掉氟的碎片,其m/z主要为(246+A)、(223+A)、(220+A)和(207+A)等(A为15或17);四氟取代联苯酚酯类液晶化合物的特征离子为酯基断裂的碎片和氟取代苯环掉氟产物,其m/z为272或271、229、200、180等。
The EIMS spectra of three kinds of negative fluorinated liquid crystal compounds are discussed in the article. The data of these compounds haven＇t been reported before. The typical ions of the bicyclohexyl phenyl compounds with two fluorine are ions derived from cyclohexyl group. The m/z are 226, 183 and 170. The typical ions of the biphenyl compounds with three fluorine are mainly derived from the fluorinated phenyl group. The m/z are （246-bA）, （233＋A）, （220＋A） and （207＋A）. The typical ions of the phenol carboxyl ester compounds wiih four fluorine are mainly derived from the carbonyl group and the fluorinated phenyl group. The m/z are 272 or 271.
出处
《液晶与显示》
CAS
CSCD
北大核心
2007年第2期146-150,共5页
Chinese Journal of Liquid Crystals and Displays
基金
国家"863"计划项目(No.2003AA311100)
关键词
负性含氟液晶
侧向氟取代液晶
质谱
质谱裂解机理
negative fluorinated liquid crystals
lateral fluorinated liquid crystals
mass spectrum
mechanism of mass spectra
