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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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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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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Tunable Spin Qubit Pairs in Quantum Dot-Molecule Conjugates.

Autumn Y Lee1, Mandefro Teferi2, Frida S Hernandez1

  • 1Department of Chemistry, Amherst College, Amherst, Massachusetts 01002, United States.

ACS Nano
|March 19, 2025
PubMed
Summary
This summary is machine-generated.

This study demonstrates tunable quantum dot-organic molecule conjugates for hosting spin-based qubit pairs and sensitizing molecular triplet states. The synthetic tunability allows for precise control over spin properties, crucial for developing functional qubit systems.

Keywords:
electron paramagnetic resonancequantum dotsspin polarizationspin qubitsspin-correlated radical pairs

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Area of Science:

  • Quantum information science
  • Materials science
  • Organic electronics

Background:

  • Organic molecules and quantum dots (QDs) are promising qubit hosts due to their synthetic tunability.
  • Spin-correlated radical pairs (SCRPs) offer initialization in defined quantum states and enable charge recombination to polarized triplet states.

Purpose of the Study:

  • To demonstrate tunable quantum dot-organic molecule conjugates for hosting spin-based qubit pairs (SQPs).
  • To sensitize molecular triplet states using these conjugates.
  • To explore the impact of QD size and linker length on qubit properties.

Main Methods:

  • Synthesis of quantum dot-molecule conjugates with variable QD size and linker lengths.
  • Optical spectroscopy to study photoexcited charge separation.
  • Light-induced time-resolved electron paramagnetic resonance (TR-EPR) spectroscopy to probe spin states.

Main Results:

  • Successful generation of long-lived charge-separated radical pairs.
  • Observation of singlet-generated SCRPs and molecular triplet states.
  • Demonstrated tunability of QD g-value with size and influence of radical pair separation on EPR line widths.

Conclusions:

  • Synthetic tunability is key for adjusting spin-specific addressability in qubit systems.
  • QD-organic molecule conjugates offer a versatile platform for quantum information applications.
  • The developed system satisfies requirements for functional qubit development.