液晶与显示2017，Vol.32Issue(7)：526-532,7.DOI:10.3788/YJYXS20173207.0526
具有含氧亚甲基中心桥键的含氟液晶化合物的质谱裂解规律研究
Fragmentation modes of fluorinated liquid crystal compounds with CH2O central-bridge-bond
张苹 1吴生秀 1王毅 1孙媛媛 1赵彤1
作者信息
- 1. 西安瑞联新材料股份有限公司,陕西 西安 710077
- 折叠
摘要
Abstract
The 16 kinds of Liquid crystalline (LC) compounds, with the structures of lateral fluoro-substituted benzopyran structures or naphthol (phenol), and CH2O moiety as a linkage group, were analyzed by GCMS.The results show that the spectra of the two kinds of compounds have obvious characteristics.The cleavage pathway was similar for the two kinds of compounds, which is that the ether bond connected to the β-hydrogen through the four-membered ring transition state rearrangement of neutral molecules, to obtain the corresponding lateral fluoro-substituted phenol ions.For the two alkoxy-substituted naphthols (phenol), when the other alkoxy groups also have β-hydrogen, the olefins are removed again by hydrogen rearrangement to give the characteristic lateral fluoro-substituted diol fragment ions.For the benzopyran compounds, the cleavage of the alkyl carbon-carbon bond is initiated by the cleavage of the σ bond to give the corresponding ions when the alkyl is on the pyran α-position.Specially, the benzopyranyl ether-based LC compounds can cause ring-opening of the pyran ring through the hydrogen rearrangement on the pyran ring to give the corresponding ions.Through the mass spectrometric analysis of these two kinds ether bond containing LC compounds, the basis for the analysis of impurities and quality monitoring of these LC compounds could obtained, which will help the identification of similar liquid crystal derivatives, meanwhile, it provides a reference for mixed crystal effective analysis.关键词
液晶/气相色谱-质谱联用分析/裂解机理Key words
liquid crystals/GC/MS/fragmentation mechanism分类
化学化工引用本文复制引用
张苹,吴生秀,王毅,孙媛媛,赵彤..具有含氧亚甲基中心桥键的含氟液晶化合物的质谱裂解规律研究[J].液晶与显示,2017,32(7):526-532,7.
