The first 1D twofold interpenetrating metal-organic network generated by 1D triple helical chains with nanosized cages.

Reaction of AgPF(6) with the asymmetric ligand 1,6-dihydro-2-methyl-6-oxo-(3,4'-bipyridine)-5-carbonitrile (1), afforded a significant silver coordination polymer {[Ag(2)(1)(3)](2).(CH(3)OH)(3).(PF(6))(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.