Abstract
A novel stable organic radical, 2,2-diphenyl-1,2-dihydrobenzo[ g]quinoline- N-oxyl ( 2), has been synthesized and structurally characterized in order to examine the ring extension effect on the known derivative, 2,2-diphenyl-1,2-dihydroquinoline- N-oxyl ( 1). Based on SQUID measurement, 2 exhibited a ferromagnetic interaction obeying the Bleaney–Bowers equation with 2 J = +4.6 cm −1. The X-ray analysis revealed an intermolecular edge–edge association of the aryl ring and N-oxyl moiety in the crystal of 2. The bifurcated edge–edge contacts between the α-spin site (nitroxyl O atom) and the β-spin site (aryl-H atoms) are responsible for the ferromagnetic interaction of 2.
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