Fragmentation modes of fluorinated liquid crystal compounds with CH<sub>2</sub>O central-bridge-bond

Ping ZHANG; Sheng-xiu WU; Yi WANG; Yuan-yuan SUN; Tong ZHAO

doi:10.3788/YJYXS20173207.0526

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Fragmentation modes of fluorinated liquid crystal compounds with CH₂O central-bridge-bond

Material Science | 更新时间：2020-08-12

- Fragmentation modes of fluorinated liquid crystal compounds with CH₂O central-bridge-bond
- Chinese Journal of Liquid Crystals and Displays Vol. 32, Issue 7, Pages: 526-532(2017)
- 作者机构：
  
  西安瑞联新材料股份有限公司, 陕西西安 710077
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20173207.0526
  CLC： O657.63
- Received：30 December 2016，
  
  Accepted：15 March 2017，
  
  Published：2017-07
- 稿件说明：
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Ping ZHANG, Sheng-xiu WU, Yi WANG, et al. Fragmentation modes of fluorinated liquid crystal compounds with CH₂O central-bridge-bond[J]. Chinese journal of liquid crystals and displays, 2017, 32(7): 526-532.
DOI：

Ping ZHANG, Sheng-xiu WU, Yi WANG, et al. Fragmentation modes of fluorinated liquid crystal compounds with CH₂O central-bridge-bond[J]. Chinese journal of liquid crystals and displays, 2017, 32(7): 526-532. DOI： 10.3788/YJYXS20173207.0526.

摘要

利用气相色谱质谱联用仪（GCMS）对含有侧向氟取代苯并吡喃结构和侧向氟取代萘酚（苯酚）结构的16个中心桥键为含氧亚甲基的醚类液晶化合物进行分析，结果表明此两类化合物的谱图具有明显的特征，化合物具有相似的裂解途径。主要是与醚键相连取代基团

位的氢通过四元环过渡态重排脱去中性分子，得到对应的侧向氟取代酚碎片离子；萘酚（苯酚）醚类化合物当结构中有两个烷氧基取代时，当另一个烷氧基也存在

氢时会再一次通过氢重排反应脱去烯烃，得到特征的侧向氟取代二酚碎片离子。对于苯并吡喃醚类化合物，当吡喃环

位有烷基取代时将通过

键的断裂引起烷基碳碳键的裂解，脱去烷基自由基得到相应的离子；特殊的，对于苯并吡喃醚类液晶化合物其可以通过吡喃环上的氢重排引起吡喃环开环从而得到对应的离子。通过对此两类含有醚键结构的液晶化合物的质谱分析可为该类液晶化合物的杂质解析与质量监测提供依据，将有助于同类液晶衍生物的识别，同时可为混晶的有效剖析提供参考。

Abstract

The 16 kinds of Liquid crystalline (LC) compounds

with the structures of lateral fluoro-substituted benzopyran structures or naphthol (phenol)

and CH

O 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

-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

-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

bond to give the corresponding ions when the alkyl is on the pyran

-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

Keywords

references

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Related Institution

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Fragmentation modes of fluorinated liquid crystal compounds with CH2O central-bridge-bond

DOI：10.3788/YJYXS20173207.0526

摘要

Abstract

关键词

Keywords

references

Fragmentation modes of fluorinated liquid crystal compounds with CH₂O central-bridge-bond