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相关概念视频

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
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
1.8K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
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.
2.0K

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相关实验视频

Updated: Jul 3, 2025

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

12.6K

黑色-氧集群,以全catecholate稳定,用于高效的光热转换.

Jinle Hou1, Nahui Huang1, Dinesh Acharya2

  • 1Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University Liaocheng 252000 People's Republic of China houjinle@lcu.edu.cn zhangxianxi@lcu.edu.cn.

Chemical science
|February 16, 2024
PubMed
概括
此摘要是机器生成的。

我们合成了新型的氧集群 (TOCs),由甲基醇连接体保护. 黑色TOC (B-TOC) Ti16表现出卓越的稳定性和优越的光电和光热性能.

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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis

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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
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Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis

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科学领域:

  • 无机化学 无机化学 有机化学
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 稳定,吸光的氧集群 (TOCs) 的受控合成具有挑战性.
  • 有机染色体对TOC稳定性和光吸收性质至关重要.

研究的目的:

  • 为了合成新的,原子精确的甲基醇功能化TOCs.
  • 研究这些TOC的结构,光学和稳定性.
  • 探索它们在光电和光热应用中的潜力.

主要方法:

  • 溶剂诱导合成策略. 溶剂诱导合成策略.
  • 合成的氧团 (Ti2,Ti8,Ti16) 的表征.
  • 评估光波段间隙,稳定性,光电反应和光热转换.

主要成果:

  • 成功合成了三种由甲基醇功能化的TOCs:Ti2,Ti8和Ti16.
  • Ti16是第一个完全受catechol保护的高核度TOC,呈黑色 (B-TOC) 且光带间隙超低.
  • 与Ti2和Ti8.8相比,Ti16表现出卓越的稳定性和优越的光电和光热能力.

结论:

  • 该研究在创建具有超低光波段间隙和高稳定性的全catecholate-protected B-TOC方面取得了重大进展.
  • 16的独特结构和特性为光热和电气应用提供了宝贵的机械洞察力.
  • 这项工作为开发用于能源转换和电子设备的先进材料铺平了道路.