Reaction of AgPF6 with the asymmetric ligand 1,6-dihydro-2-methyl-6-oxo-(3,4′-bipyridine)-5-carbonitrile (1), afforded a significant silver coordination polymer {[Ag2(1)3]2·(CH3OH)3·(PF6)4}n (2) with unique 1D twofold interpenetrating metal–organic frameworks constructed by 1D triple helical chains with nanosized cages hosting counterions as guests. This compound exhibits high thermal stability and blue-shift emission with large intensity enhancement compared with that of the free ligand.
