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Related Concept Videos

Carbocations02:10

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
The Antenna Complex01:15

The Antenna Complex

Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is confirmed through isotopic...

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Related Experiment Video

Updated: Jun 27, 2026

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
12:19

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

Aggregation-Induced Emission Governed by Self-Assembly Pathways in NHC-Au(I) Carbazolate Complexes.

Mirco Scaccaglia1, Francesca Campagna1, Elisa Pelorosso1

  • 1Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, Padova 35131, Italy.

Inorganic Chemistry
|June 25, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed novel gold(I) complexes exhibiting aggregation-induced emission (AIE). These materials show tunable luminescence, offering a new pathway for designing advanced solid-state emitters with programmable properties.

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

Related Experiment Videos

Last Updated: Jun 27, 2026

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
12:19

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
19:58

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Organometallic Chemistry

Background:

  • Aggregation-induced emission (AIE) is crucial for solid-state luminescent materials.
  • N-heterocyclic carbene (NHC) gold(I) complexes offer unique electronic properties.

Purpose of the Study:

  • To design and synthesize novel NHC gold(I) complexes with donor-metal-acceptor architectures.
  • To investigate the impact of molecular design on supramolecular assembly and emissive behavior.

Main Methods:

  • Synthesis of two NHC gold(I) complexes with carbazolate donors and cyano-substituted acceptors.
  • Characterization of photophysical properties, including luminescence and aggregation behavior.
  • Analysis of supramolecular structures and intermolecular interactions (π-π stacking, Au···Au).

Main Results:

  • Both complexes exhibit strong luminescence upon aggregation, characteristic of AIE.
  • One complex forms orange-emissive fibers via π-π stacking and aurophilic interactions.
  • The other complex shows complex emissive pathway dynamics, transitioning from green to orange emission.

Conclusions:

  • Molecular design significantly influences supramolecular dynamics and emissive properties in metal-based AIE systems.
  • These findings provide a route to programmable emissive behavior in advanced luminescent materials.