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6,6′-Diamino-2,2′-bipyridine (1a) has been found to exhibit a strong fluorescence in the near-UV region.Some amino and/or chloro substituted bipyridines (bpys) have been synthesized an studied to show that only 6-amino-substtuted derivatives exhibited a strong emission.The emission of 6-amino-6′-chloro-bpy (3a) was the strongest (lambdamax = 429.0 nm; Phi = 0.78 in ethanol) among them.On the other hand, little or no emission was observed for monochloro-, dichloro- and 4-amino- derivatives.
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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI