Page 62 - 精细化工2019年第10期
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第 36 卷第 10 期                            精   细   化   工                                 Vol.36, No.10
             2019 年 10 月                             FINE CHEMICALS                                 Oct.    2019


              功能材料
                      BODIPY 荧光二向性液晶染料的制备及性能



                                                                      *
                                                  潘柔辰,李晓莲
                                   (大连理工大学  精细化工国家重点实验室,辽宁  大连    116024)

                 摘要:以 8-(4-碘苯基)氟硼吡咯为原料,与 4-乙炔基苯基胆甾醇酯或 4-乙炔基苯戊基双环己基甲醇酯进行
                                                                                                 13
                                                                                          1
                 Sonogashira 偶联反应,制备了两个含氟的荧光二向性液晶染料 DC-1 和 DC-2,其化学结构均由 HNMR、 CNMR
                 和 HRMS 鉴定。将染料 DC-1 和 DC-2 进行光谱测试,最大吸收波长和最大发射波长分别在 503 和 517 nm,发
                 亮绿色荧光。基于宾-主(G-H)效应,将染料 DC-1 和 DC-2 作为宾体组分溶于主体液晶 E7 中,测得 DC-2 在
                 液晶 E7 中的吸收二向色比高达 8.91,有序参数为 0.73,可应用在宾-主型液晶显示器(GH-LCD)中。经差热
                 扫描量热仪(DSC)测试,染料 DC-1 和 DC-2 在一定温度范围内具有介晶性质,并通过偏光显微镜(POM)验
                 证了 DC-1 和 DC-2 的液晶织构。
                 关键词:宾-主效应;BODIPY;荧光二向性染料;二向色比;有序参数;液晶相;功能材料
                 中图分类号:TQ617      文献标识码:A      文章编号:1003-5214 (2019) 10-2028-07


                              Preparation and Properties of BODIPY Fluorescent
                                           Dichroic Liquid Crystal Dyes


                                                                         *
                                                PAN Rou-chen, LI Xiao-lian
                    (State Key Laboratory of Fine Chemicals,Dalian University of Technology, Dalian 116024, Liaoning, China)


                 Abstract: Two fluorinated fluorescent dichroic liquid crystal dyes DC-1 and DC-2 were synthesized by
                 Sonogashira coupling reaction of 8-(4-iodophenyl) fluoroboropyrrol with cholesteryl 4-ethynylbenzoic acid
                 or  4-[(1s,4r)-4-pentylcyclohexyl]cyclohexyl  4-ethynylbenzoate.  Their  chemical  structures  were  identified
                    1
                            13
                 by  HNMR,  CNMR  and  HRMS.  After  the  spectrum  test  conducted  on  dyes  DC-1  and  DC-2,  their
                 maximum  absorption  wavelengths  and  maximum  emission  wavelengths  were  503  nm  and  517  nm,
                 respectively. They emitted green fluorescence. Based on the Guest-Host (G-H) effect, dyes DC-1 and DC-2
                 as the guest component were dissolved in the host liquid crystal E7, the absorption dichroic ratio of DC-2 in
                 the host liquid crystal E7 was as high as 8.91, and the ordered parameter was 0.73. Thus, dye DC-2 can be
                 used in the Guest-Host liquid crystal display (GH-LCD). The mesomorphic properties of dyes DC-1 and
                 DC-2  were  tested  by  differential  scanning  calorimeter  (DSC)  in  a  certain  temperature  range.  The  liquid
                 crystal texture of dyes DC-1 and DC-2 was verified by polarizing microscope (POM).
                 Key words: Guest-Host (G-H) effect; BODIPY; fluorescent dichroic dye; dichroicratio; ordered parameter;
                 liquid crystal phase; functional materials


                                                                             [5]
                 宾-主型液晶显示(GH-LCD)是实现彩色液晶                       型液晶混合体系 。当该体系被施加电压时,染料
            显示的重要模式,相比于薄膜晶体管液晶显示                               分子可随液晶分子的取向发生有序偏转,从而产生
            (TFT-LCD)    [1-2] ,该模式不仅可以用自然光代替                  宾-主(G-H)效应。由于二向性染料在光学上具有
            LED 背光源,还能减少甚至不需要使用偏振片,因                           吸收各向异性特点,因此,在 G-H 效应下可以对自
            此,可以有效地提高光源利用率              [3-4] 。若在液晶主材料         然光起到偏振化作用。
            中掺杂少量宾体二向色性染料,可以构成“宾-主”                                为了能更好地配合主体液晶的有序取向,宾体


                 收稿日期:2019-04-11;  定用日期:2019-04-30; DOI: 10.13550/j.jxhg.20190302
                 基金项目:国家自然科学基金(21576043)
                 作者简介:潘柔辰(1994—),女,硕士生。联系人:李晓莲(1962—),女,副教授,硕士生导师,E-mail:xlianli@dlut.edu.cn。
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