Thermal Behaviors and Crystal Structure of Hemicyanines

Acta Scientiarum Naturalium Universitatis Pekinensis

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Thermal Behaviors and Crystal Structure of Hemicyanines

WANG Kezhi¹, HUANG Chunhui¹, ZHOU Yongfen¹, XU Guangxian¹, ZHOU Qifeng², LIN Xiuyun³

¹State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871; ²College of Chemistry and Molecular Engineering, Peking University, Beijing,100871; ³Institute of Biophysics, Academia Sinica, Beijing, 100101

Received:1994-04-20 Online:1996-03-20 Published:1996-03-20

半菁化合物热行为和晶体结构的研究

王科志¹, 黄春辉¹, 周永芬¹, 徐光宪¹, 周其凤², 林秀云³

¹北京大学稀土材料化学与应用国家重点实验室，北京，100871; ²北京大学化学与分子工程学院，北京，100871; ³中国科学院生物物理研究所，北京，100101

Abstract

Abstract: 5 hemicyanines with the compositions of Me₂ＮＣ₆Ｈ₄ＣＨ=ＣＨC₅Ｈ₄ＮＣ_nH_2n+1Br (n=16, 12, 4, 2 and 1) have been synthesized and characterized by elemental analysis, thermalgravimetric, differential thermal analysis (TG-DTA), differential scan calorimetry (DSC), ultraviolet and infrared spectroscopy. For the first time, a hemicyanine Me₂ＮＣ₆Ｈ₄ＣＨ=ＣＨＣ₅Ｈ₄ＮＣ₁₆Ｈ₃₃Ｂr has been characterized to be of a mesogenic behavior with typical focal conical texture. The structure of Me₂ＮＣ₆Ｈ₄ＣＨ=ＣＨＣ₅Ｈ₄ＮＣ₂Ｈ₅Ｂr.nH2Ｏ has been determined by singal crystal X-ray diffraction. The crystal belong to monoclinic, Ｐ２₁／Ｃ space group. The crystal parameters are as follows: a=1.6125(8), b=1.7391(12), c=1.8784(8) nm, β=99.794(8)°, Ｖ=5.220(5) nm^３, Ｚ=12.

Key words: hemicyanine, liquid crystal, crystal structure

摘要： 合成了5个不同烷基链长的半菁化合物：Me₂ＮＣ₆Ｈ₄ＣＨ＝ＣＨＣ₅Ｈ₄ ＮＣ_nH_2n+1Br(n=16, 12, 4, 2和1)。由可见光谱、红外光谱、差热(DTA)、热重(TG)谱、微分扫描量热分析和偏光显微镜研究结果，讨论了烷基链长的变化对半菁化合物有关性质的影响。首次发现n=16时半菁化合物为近晶型双变性液晶，90°偏光显微镜下，呈典型的焦锥织态结构。测定了化合物Me₂ＮＣ₆Ｈ₄ＣＨ=ＣＨＣ₅Ｈ₄ＮＣ₂Ｈ₅Ｂr·nＨ₂Ｏ的晶体结构。晶体属单斜晶系，空间群Ｐ2₁／Ｃ，晶胞参数：a=1.6125(9), b=1.739 1(12), c=1.878 4(8) nm, β=99.794(8)°, Ｖ=5.220(5) nm³, Ｚ＝12。

关键词: 半菁, 液晶, 晶体结构

CLC Number:

O641

WANG Kezhi,HUANG Chunhui,ZHOU Yongfen,XU Guangxian,ZHOU Qifeng,LIN Xiuyun. Thermal Behaviors and Crystal Structure of Hemicyanines[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

王科志, 黄春辉, 周永芬, 徐光宪, 周其凤, 林秀云 . 半菁化合物热行为和晶体结构的研究[J]. 北京大学学报（自然科学版）.

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Thermal Behaviors and Crystal Structure of Hemicyanines

半菁化合物热行为和晶体结构的研究

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