Spin-Polarized Radicals with Extremely Long Spin–Lattice Relaxation Time at Room Temperature in a Metal–Organic Framework

• DOI: 10.1021/jacs.3c09563
• Publication Date: 2023-12-11T17:53:35Z
• Authors: Kana Orihashi; Akio Yamauchi; Saiya Fujiwara; Mizue Asada; Toshikazu Nakamura; Joseph Ka-Ho Hui; Nobuo Kimizuka; Kenichiro Tateishi; Tomohiro Uesaka; Nobuhiro Yanai
• Keywords: Photoexcitation

The generation of spin polarization is key in quantum information science and dynamic nuclear polarization. Polarized electron spins with long spin–lattice relaxation times (T1) at room temperature are important for these applications but have been difficult to achieve. We report the realization spin-polarized radicals extremely T1 a metal–organic framework (MOF) which azaacene chromophores densely integrated. Persistent generated MOF by charge separation after photoexcitation. Spin triplet photoexcitation successfully transferred persistent radicals. Pulse resonance measurements reveal that polarized radical as 214 μs relatively spin–spin time T2 up 0.98 temperature. achievement MOFs nanopores accessible guest molecules will be an cornerstone future highly sensitive sensing efficient