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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Understanding and Controlling Intersystem Crossing in Molecules.

Christel M Marian1

  • 1Institute of Theoretical and Computational Chemistry, Heinrich Heine University, Düsseldorf 40204, Germany;

Annual Review of Physical Chemistry
|February 20, 2021
PubMed
Summary
This summary is machine-generated.

This review explains intersystem crossing (ISC) in molecules, focusing on spin-orbit coupling (SOC) as the primary mechanism. It details factors influencing ISC efficiency, crucial for applications like organic light-emitting diodes (OLEDs).

Keywords:
El-Sayed ruleOLED emitteraromatic ketoneenergy gap lawheavy-atom effecthyperfine interactionsolvent effectspin–orbit couplingspin–spin coupling

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Area of Science:

  • Molecular Physics
  • Quantum Chemistry
  • Photochemistry

Background:

  • Intersystem crossing (ISC) involves transitions between molecular states with different electron spin multiplicities.
  • Spin-orbit coupling (SOC) is the dominant mechanism enabling ISC, though spin-spin coupling (SSC) and hyperfine interaction (HFI) can also play roles.
  • Understanding ISC is vital for developing advanced materials, particularly in organic light-emitting diodes (OLEDs).

Purpose of the Study:

  • To provide a theoretical foundation for understanding intersystem crossing (ISC) in molecules.
  • To elucidate the mechanisms of ISC, with a focus on spin-orbit coupling (SOC).
  • To guide researchers in manipulating ISC efficiency through chemical and environmental factors.

Main Methods:

  • Theoretical review of spin-dependent interactions (SOC, SSC, HFI).
  • Discussion of qualitative rules for estimating ISC transition probabilities.
  • Analysis of case studies demonstrating the impact of chemical substitution and solvent effects on ISC.

Main Results:

  • Spin-orbit coupling (SOC) is identified as the most significant factor for intersystem crossing (ISC).
  • Qualitative rules are presented for predicting ISC rates.
  • Chemical and environmental factors demonstrably influence ISC efficiency, offering avenues for optimization.

Conclusions:

  • A comprehensive understanding of ISC mechanisms, particularly SOC-driven processes, is essential for molecular science.
  • The review equips readers with knowledge to control ISC for applications like OLEDs.
  • Further research into factors governing ISC can lead to enhanced material performance.