4,6-dibromoselenolo[2,3-c]thiophene | 1260686-73-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并噻吩类
• 英文名称: 4,6-dibromoselenolo[2,3-c]thiophene
• CAS: 1260686-73-4
• 化学式: C₆H₂Br₂SSe
• 分子量: 344.916
• InChiKey: PBCSOFALPVNXQV-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.48
• 重原子数：
  10.0
• 可旋转键数：
  0.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  1.0

反应信息

• 作为产物：
  描述：

  3-bromo-4-(trimethylsilyl)ethynylselenophene 在 N-溴代丁二酰亚胺(NBS) 、 正丁基锂 、 水 作用下， 以 乙醚 、 正己烷 、 氯仿 为溶剂， 反应 6.5h， 生成 4,6-dibromoselenolo[2,3-c]thiophene
  参考文献：
  名称：

  Tuning the Band Gap of Low-Band-Gap Polyselenophenes and Polythiophenes: The Effect of the Heteroatom

  摘要：

  A series of new low-band-gap thieno- or selenolo-fused polyselenophenes (P5 and P6) and selenolo-fused polythiophene (P4) (as well as previously reported thieno-fused polythiophene, P3) was prepared systematically by electropolymerization (P4-P6) and by solid-state polymerization (P3, P5 and P6). The 2,5-dibrominated monomers (3Br(2), 5Br(2), and 6Br(2)) undergo solid-state polymerization under slight heating and produce insoluble P3, P5, and P6 as black conducting powders. The spectroelectrochemically measured optical band gaps of P4-P6 films are 0.96, 0.72, and 0.76 eV, respectively. DFT calculations performed on P3-P6 provide excellent estimations of the experimental band gaps of these polymers. The band gap of the polyselenophenes (P5 and P6) is 0.2 eV lower than that of the corresponding polythiophenes (P3 and P4). We introduced a new scheme for band gap control in conjugated polymers by replacing the sulfur atom with a selenium atom in the main and/or peripheral ring, which leads to significant and predictable changes in the band gap of the polymers. This is due to the lower aromaticity of a selenophene ring compared to a thiophene ring. Thus, we have achieved band gap control in very low band gap (similar to 0.7-1.0 eV) polymers through the use of different combinations of selenium and sulfur atoms in the main and peripheral rings.

  DOI：

  10.1021/cm102395v