Abstract
A cytosine-substituted nitronyl nitroxide monoradical 1 and a biradical 2 with a singlet ( S = 0) ground state have been synthesized and characterized as building blocks for organic molecule-based magnets. X-ray crystallographic analyses have shown that the molecular packing of 1 features in intermolecular hydrogen bonding of the cytosine moiety, giving a spin ladder chain structure based on nitronyl nitroxide radical moieties. For the biradical 2, the magnetic susceptibility suggests the singlet ground state with the intramolecular antiferromagnetic exchange interaction of J/ k B ∼ −5 K. These radicals can be components for Watson–Crick base pairing, leading to hydrogen-bonded heteromolecular assembly such as bio-inspired molecule-based ferrimagnets.
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