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Related Concept Videos

Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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BINOL derivatives with aggression-induced emission.

Lei Shi1, Kun Li, Peng-Cheng Cui

  • 1Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China. kli@scu.edu.cn xqyu@scu.edu.cn.

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Summary

Researchers developed new BINOL derivatives that overcome limitations of traditional fluorescent probes. These compounds can switch from ACQ to AIE properties, enabling effective bioimaging with low cytotoxicity.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Biomedical Imaging

Background:

  • Traditional BINOL derivatives suffer from small Stokes shift and Aggregation-Caused Quenching (ACQ) effects, limiting their use as fluorescent probes.
  • Aggregation-Induced Emission (AIE) is a desirable property for fluorescent probes, offering enhanced signal in aggregated states.
  • Developing novel fluorophores with tunable properties is crucial for advancing bioimaging techniques.

Purpose of the Study:

  • To synthesize novel BINOL derivatives with tunable photophysical properties.
  • To investigate the conversion of Aggregation-Caused Quenching (ACQ) to Aggregation-Induced Emission (AIE) characteristics by modifying electron-withdrawing groups.
  • To evaluate the potential of these new derivatives as fluorescent probes for bioimaging applications.

Main Methods:

  • Synthesis of a new series of BINOL derivatives.
  • Characterization of photophysical properties, including Stokes shift and ACQ/AIE behavior.
  • Cytotoxicity assessment of promising candidates.
  • In vitro bioimaging studies to demonstrate probe performance.

Main Results:

  • A series of BINOL derivatives were successfully synthesized.
  • The photophysical properties were modulated by changing the electron-withdrawing group, enabling a switch from ACQ to AIE.
  • BIN-COP demonstrated significant AIE properties and low cytotoxicity.
  • Successful application of the designed fluorophores in bioimaging was confirmed.

Conclusions:

  • Novel BINOL derivatives with tunable ACQ-to-AIE properties were developed.
  • BIN-COP is a promising AIE fluorophore with low cytotoxicity for bioimaging.
  • These findings offer new possibilities for designing advanced fluorescent probes for biological applications.