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Single-Carbon Bridged Pentacene Dimers Enable Efficient Singlet Fission and Quintet State Stabilization
Chao-Hsien Hsu1, Yi-Ching Liao1, Chu-Chun Cheng2
1Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106319, Taiwan.
Journal of the American Chemical Society
|January 23, 2026
Summary
Singlet fission (SF) generates high-spin states for quantum information. A new molecular design stabilizes these states by anchoring pentacene chromophores, extending their lifetime for quantum technology applications.
Area of Science:
- Quantum information science
- Molecular design
- Spin physics
Background:
- Singlet fission (SF) generates spin-entangled triplet pairs (5TT) for multilevel spin qubits.
- 5TT states face challenges due to rapid decay via dissociation, annihilation, or spin conversion.
Purpose of the Study:
- To introduce a novel molecular design for prolonging 5TT lifetime.
- To stabilize high-spin multiexciton states for quantum technologies.
Main Methods:
- Synthesized FlePc2 and FlePhPc2 molecules with two pentacene chromophores attached to a fluorene bridge.
- Utilized field-swept electron spin echo (FS-ESE) measurements.
- Performed theoretical calculations to predict binding energy and spin density.
Main Results:
- The single-point attachment enforced a near-parallel geometry, promoting spin interactions and hindering dissociation.
- FS-ESE measurements showed dominant 5TT signals, indicating suppressed relaxation.
- Theoretical calculations confirmed substantial binding energy and spin density delocalization.
Conclusions:
- Established a molecular design principle for kinetically trapping high-spin multiexciton states.
- Demonstrated a method to stabilize 5TT states, crucial for advancing spin-based quantum technologies.
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