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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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
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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.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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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.
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All-catecholate-stabilized black titanium-oxo clusters for efficient photothermal conversion.

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.

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|February 16, 2024
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Summary
This summary is machine-generated.

We synthesized novel titanium-oxo clusters (TOCs) protected by catechol ligands. The black TOC (B-TOC) Ti16 exhibits exceptional stability and superior photoelectric and photothermal properties.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Controlled synthesis of stable, light-absorbing titanium-oxo clusters (TOCs) is challenging.
  • Organic dye ligands are crucial for TOC stability and light absorption properties.

Purpose of the Study:

  • To synthesize novel, atomically precise catechol-functionalized TOCs.
  • To investigate the structural, optical, and stability properties of these TOCs.
  • To explore their potential in photoelectric and photothermal applications.

Main Methods:

  • Solvent-induced synthesis strategy.
  • Characterization of synthesized titanium-oxo clusters (Ti2, Ti8, Ti16).
  • Evaluation of optical band gap, stability, photoelectric response, and photothermal conversion.

Main Results:

  • Successfully synthesized three catechol-functionalized TOCs: Ti2, Ti8, and Ti16.
  • Ti16 is the first all-catechol-protected high-nuclearity TOC, appearing black (B-TOC) with an ultralow optical band gap.
  • Ti16 demonstrates exceptional stability and superior photoelectric and photothermal capabilities compared to Ti2 and Ti8.

Conclusions:

  • The study presents a significant advancement in creating all-catecholate-protected B-TOCs with ultralow optical band gaps and high stability.
  • Ti16's unique structure and properties offer valuable mechanistic insights for photothermal and electric applications.
  • This work paves the way for developing advanced materials for energy conversion and electronic devices.