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相关概念视频

Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...

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用于有机电子的三维网络组装的三叶轮

Dong Meng1,2, Huiting Fu1,3,2, Chengyi Xiao1,2

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.

Journal of the American Chemical Society
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概括

两种新型的联烯染料,即三烯六化物 (TPH) 和取消的TPH (TPH-Se),具有出色的电子传输特性. 这些染料在太阳能电池中实现了高功率转换效率,证明了它们在先进的光电子应用中的潜力.

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科学领域:

  • 材料科学
  • 有机电子
  • 太阳能发电

背景情况:

  • 结合的有机分子对于开发高效的光电子设备至关重要.
  • 由于其优异的电子接受特性和稳定性,烯二氧化物 (PBIs) 被广泛研究.
  • 开发具有增强性能的新型PBI衍生品仍然是一个活跃的研究领域.

研究的目的:

  • 合成和描述两种新的C3对称结合烯染料:三烯六化物 (TPH) 和取消的TPH (TPH-Se).
  • 研究TPH和TPH-Se的结构,光学和电子特性.
  • 评估基于接受器的太阳能电池中的TPH和TPH-Se的性能.

主要方法:

  • 有效的合成TPH和TPH-Se.
  • 用光谱分析 (UV-Vis吸收) 来确定光学特性.
  • 单晶X射线衍射以阐明分子和晶体结构.
  • 单晶晶体的制造和测试以评估电子的移动性.
  • 基于TPH和TPH-Se的太阳能电池的构造和特征.

主要成果:

  • 无论是TPH还是TPH-Se都表现出广泛而强烈的吸收 (300-600 nm) 和适当的LUMO水平 (-3.8 eV).
  • TPH显示了一个扭曲的螺旋配置和一个具有强大的π-π相互作用的3D网络.
  • 由于Se·O相互作用,TPH-Se具有更扭曲的螺旋和更紧的3D网络.
  • 这两种材料在单晶晶体中表现出良好的电子传输能力.
  • 基于TPH和TPH-Se的太阳能电池实现了分别8.28%和9.28%的高功率转换效率.

结论:

  • 合成的TPH和TPH-Se染料对太阳能电池应用具有有利的光电子特性.
  • 独特的分子结构和分子间相互作用有助于提高它们的性能.
  • 这些新型烯衍生物为高效的有机太阳能电池提供了有前途的材料.