The abstract is read at the publisher; the summary is JClub's.
A zinc tetrakis(4-carboxyphenyl)porphyrin-based metal-organic framework with N,N'-di(4-pyridyl)-1,4,5,8-naphthalenetetracarboxdiimide forms strongly coupled triplet radical pairs polarized in the zero-spin sublevel.
- Why it matters: Spin hyperpolarization from photogenerated radical pairs is hard to translate from isolated molecules to ordered materials with controlled local donor–acceptor geometry.
- What they did: The framework’s dense donor–acceptor packing quenches the porphyrin singlet excited state and selectively generates triplet radical pairs, whose electron paramagnetic resonance and spin-lattice relaxation times are measured.
- The result: The radical pairs show narrow EPR signals and long spin-lattice relaxation times that persist across different guest solvents and change with guest identity, enabling chemically responsive porous spin materials.
The findingWhy it mattersWhat they didThe result
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