一个光学活跃的结合性电解质的自组装
Julia H Ortony1, Tirtha Chatterjee, Logan E Garner
1Department of Chemistry and Biochemistry, Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.
Journal of the American Chemical Society
|May 10, 2011
概括
像DSBNI这样的合电解质在水中形成纳米圆柱体,增强光学特性,例如两光子吸收. 这种自组装对于光电子设备应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 光电学是指光电子产品.
背景情况:
- 结合的橄电解质对于光电子,生物传感器和跨膜电荷传输至关重要.
- 水溶性是这些应用的关键,但对光学性能的自我组装效应尚未研究.
研究的目的:
- 调查DSBNI (1,4-bis(4'-(N,N-bis(6''-(N,N,N-trimethylammonium (hexyl) amino) -styryl (四) 在水中的自组装如何影响其光学性能.
- 确定DSBNI聚合物的结构特征.
主要方法:
- 液体原子力显微镜 (AFM) 和冷传导电子显微镜 (cryo-TEM) 用于成像.
- 微角中子散射 (SANS) 用于现场聚合维度量化.
主要成果:
- DSBNI聚合增加了光寿命和两光子吸收截面,具有低色变化.
- 平面DSBNI分子堆叠到一个临界度以上的纳米筒中.
- AFM和cryo-TEM表明表面相互作用可以促进纤维形成,而SANS则表明具有较低比例的一致包装.
结论:
- DSBNI自组装成纳米圆柱体显著改变光学性能.
- 了解聚合物结构和光学演变是设计新光电子材料的关键.
相关概念视频
01:26Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
01:17Thermal Electrocyclic Reactions: Stereochemistry
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.