1,4-Difluoro-2,3,5,6-benzenetetracarboxylic dianhydride | 46861-94-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 异苯并呋喃
• 英文名称: 1,4-Difluoro-2,3,5,6-benzenetetracarboxylic dianhydride
• 英文别名: difluoropyromellitic dianhydride；3,6-difluoro-1,2,4,5-benzenetetracarboxylic dianhydride；4,8-Difluorofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone
• CAS: 46861-94-3
• 化学式: C₁₀F₂O₆
• 分子量: 254.103
• InChiKey: WNMRFYNFVYCNDL-UHFFFAOYSA-N

物化性质

• 沸点：
  441.9±45.0 °C(Predicted)
• 密度：
  2.047±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  0.9
• 重原子数：
  18
• 可旋转键数：
  0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  86.7
• 氢给体数：
  0
• 氢受体数：
  8

反应信息

• 作为反应物：
  描述：

  1,4-Difluoro-2,3,5,6-benzenetetracarboxylic dianhydride 在 硫酸 、 氢溴酸 作用下， 以 N,N-二甲基乙酰胺 、 溶剂黄146 为溶剂， 反应 88.0h， 生成 二羟基-苯-1,2,4,5-四羧酸
  参考文献：
  名称：

  Polyimide and Imide Compound Exhibiting Bright Red Fluorescence with Very Large Stokes Shifts via Excited-State Intramolecular Proton Transfer

  摘要：

  A novel polyimide (PI) emitting a prominent red fluorescence was prepared based on 3,6-dihydroxypyromellitic dianhydride (P2HDA) and 4,4'-diaminocyclohexylmethane (DCHM). In order to investigate the fluorescence properties of the PI, an imide model compound, N,N'-dicyclohexyl-3,6-dihydroxypyromellitimide (P2H-Ch), corresponding to one repeating unit of the PI, was also synthesized. The UVvis absorption and fluorescence spectra of P2H-Ch in CHCl3 and the solid PI film demonstrated intense red fluorescence at around 640 nm with a very large Stokes shift (nu) of 7655 and 8994 cm(-1), respectively, via the excited-state intramolecular proton transfer (ESIPT). Moreover, the corresponding monoanion and dianion species were formed in basic conditions with an organic base (DBU) and basic salt (NaOH), which were characterized by highly visible halochromism. The introduction of -OH groups into the pyromellitic moiety of imide compounds or PIs at their para positions led to the long-wavelength fluorescent emission as well as to the high pH sensitivity.

  DOI：

  10.1021/ma502456f
• 作为产物：
  描述：

  difluoropyromellitic acid 在 乙酸酐 作用下， 反应 2.0h， 生成 1,4-Difluoro-2,3,5,6-benzenetetracarboxylic dianhydride
  参考文献：
  名称：

  苯二炔（1,2,4,5-四氢苯）：在低温氮基质中通过波长选择性光解苯四甲酸二酐的直接观察

  摘要：

  为了直接观察苯二炔，我们研究了 5 种苯四甲酸二酐衍生物在 13 K 氮基质中的波长选择性光解。在光解的第一步中，所有二酐都转化为苯二甲酸酐，并在辐照时损失了 CO 和 CO2在 308 纳米。在第二步中，苄基中间体在 266 nm 处被光解。在这些光解中，通过观察和计算的红外光谱之间的良好对应关系证实了两种苯二炔的产生，即 3,6-二氟-1,4-苯二炔和 3,6-双（三氟甲基）-1,4-苯二炔. 这些苯二炔在 266 nm 下进一步照射后转化为相应的六炔。在其他三种二酐的光解中未观察到苯二炔：仅观察到六炔作为主要的光产物。这些结果表明苯二炔首先生成然后转化为己三炔，并且苯二炔的分解效率取决于取代基。通过使用连续反应方案分析了基质中苯二炔的产生和分解的动力学。

  DOI：

  10.1021/ja017566n

文献信息

• Liquid crystal display device with adjusted pretilt angles for the liquid crystal molecules and method for manufacturing the display device
  申请人：Sony Corporation

  公开号：EP2383605A2

  公开（公告）日：2011-11-02

  A method of manufacturing a liquid crystal display element capable of easily improving response characteristics without using a large apparatus is provided. After alignment films 22 and 32 made of a polymer compound including a crosslinkable functional group as a side chain and a bulky skeleton such as an adamantane skeleton are formed in a TFT substrate 20 and a CF substrate 30, the alignment films 22 and 32 are arranged to face each other, and a liquid crystal layer 40 including liquid crystal molecules 41 is sealed between the alignment films 22 and 32, and then, in a state where the liquid crystal molecules 41 are aligned to allow long-axis directions thereof to be oblique with respect to a substrate surface, the polymer compound in the alignment films 22 and 32 is reacted to form a polymer compound including a cross-linked structure, and predetermined pretilts are provided to liquid crystal molecules 41 A and 41B placed in proximity to the alignment films 22 and 32, respectively.

  本发明提供了一种无需使用大型设备即可轻松提高响应特性的液晶显示元件的制造方法。在 TFT 衬底 20 和 CF 衬底 30 中形成由包括作为侧链的可交联官能团和大骨架（如金刚烷骨架）的聚合物化合物制成的对准膜 22 和 32 后，将对准膜 22 和 32 朝向彼此排列，并在对准膜 22 和 32 之间密封包括液晶分子 41 的液晶层 40，然后、在液晶分子 41 对齐以允许其长轴方向相对于基板表面倾斜的状态下，对齐膜 22 和 32 中的聚合物化合物进行反应以形成包括交联结构的聚合物化合物，并向分别靠近对齐膜 22 和 32 的液晶分子 41 A 和 41B 提供预定的预倾斜。
• Gas separation membrane, gas separation module, gas separation device, and gas separation method
  申请人：FUJIFILM Corporation

  公开号：US10040035B2

  公开（公告）日：2018-08-07

  Provided are a gas separation membrane which includes a gas separation layer formed to include a polyimide compound and in which the polyimide compound includes a repeating unit represented by the following Formula (I), a gas separation module, a gas separation device, and a gas separation method using the same. In Formula (I), R represents a group having a specific structure. R3 represents a specific substituent group. A1 to A3 represent a hydrogen atom or a specific substituent group, but all of A1 to A3 do not represent a hydrogen atom at the same time. In this case, at least one of R3, A1, A2, and A3 represents a specific polar group.

  本发明提供了一种气体分离膜，该膜包括由聚酰亚胺化合物形成的气体分离层，其中聚酰亚胺化合物包括由下式（I）表示的重复单元；还提供了一种气体分离组件、一种气体分离装置和一种使用该膜的气体分离方法。 式（I）中，R 代表具有特定结构的基团。R3 代表特定的取代基。A1 至 A3 代表氢原子或特定取代基，但所有 A1 至 A3 不同时代表氢原子。 在这种情况下，R3、A1、A2 和 A3 中至少有一个代表特定的极性基团。
• Gas separation composite membrane, gas separation module, gas separation device, gas separation method, and method of producing gas separation composite membrane
  申请人：FUJIFILM Corporation

  公开号：US10226743B2

  公开（公告）日：2019-03-12

  Provided are a gas separation composite membrane including a gas separation layer which is formed to include a polyimide compound on the upper side of a gas permeating support, in which the solubility of the polyimide compound in dimethylacetamide at 20° C. is 20 mg/100 g or less, and the thickness of the gas separation layer is 0.1 μm or greater and less than 5.0 μm, a method of producing the same, a gas separation module using the gas separation composite membrane, a gas separation device, and a gas separation method.

  本发明提供了一种气体分离复合膜，包括气体分离层，该气体分离层是在气体渗透支架的上侧形成的，其中包括聚酰亚胺化合物，聚酰亚胺化合物在 20° C 时在二甲基乙酰胺中的溶解度为 20 mg/100 g 或以下，气体分离层的厚度为 0.1 μm 或以上且小于 5.0 μm；本发明还提供了一种生产方法、一种使用该气体分离复合膜的气体分离组件、一种气体分离装置和一种气体分离方法。
• Method for producing gas separation composite membrane, liquid composition, gas separation composite membrane, gas separation module, gas separation apparatus, and gas separation method
  申请人：FUJIFILM Corporation

  公开号：US10654005B2

  公开（公告）日：2020-05-19

  The method for producing a gas separation composite membrane includes applying a mixed liquid containing compounds (a) and (b) below onto a porous support to form a coating film and curing the coating film to form a crosslinked polysiloxane compound layer: (a) a particular crosslinkable polysiloxane compound having a structural unit (a1), a structural unit (a2), and a structural unit (a3) or (a4), and (b) a particular crosslinkable polysiloxane compound having a structural unit (b1), a structural unit (b2), and a structural unit (b3) or (b4), where R1a to R1f and R2a to R2f represent a particular group and * represents a particular linking site.

  生产气体分离复合膜的方法包括将含有以下化合物（a）和（b）的混合液体涂抹在多孔支架上以形成涂膜，并固化涂膜以形成交联聚硅氧烷化合物层： (a) 具有结构单元(a1)、结构单元(a2)和结构单元(a3)或(a4)的特定可交联聚硅氧烷化合物，和 (b) 具有结构单元(b1)、结构单元(b2)和结构单元(b3)或(b4)的特定可交联聚硅氧烷化合物、 其中 R1a 至 R1f 和 R2a 至 R2f 代表一个特定的组，* 代表一个特定的连接点。
• LIQUID CRYSTAL DISPLAY UNIT AND METHOD OF MANUFACTURING THE SAME
  申请人：Suwa Shunichi

  公开号：US20110157531A1

  公开（公告）日：2011-06-30

  A method of manufacturing a liquid crystal display device with which response characteristics are able to be easily improved without using major equipment is provided. The method of manufacturing a liquid crystal display device includes steps of forming a first alignment film 22 including a polymer compound having a crosslinkable functional group as a side chain on one substrate of a pair of substrates 20 and 30 ; forming a second alignment film 32 on the other substrate of the pair of substrates 20 and 30 ; arranging the pair of substrates 20 and 30 so that the first alignment film 22 and the second alignment film 32 are opposed to each other, and sealing a liquid crystal layer 40 containing a liquid crystal molecule 41 having negative dielectric constant anisotropy between the first alignment film 22 and the second alignment film 32 ; and bridging the polymer compound to give pretilt to the liquid crystal molecule 41 after sealing the liquid crystal layer 40.