Metallogels and Silver Nanoparticles Generated from a Series of Transition Metal-Based Coordination Polymers Derived from a New Bis-pyridyl-bis-amide Ligand and Various Carboxylates

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A new series of coordination polymers, namely, CP2 [{(H 2 O)Co 1.5 (μ-3-bpna) 1.5 (μ-btc)}·3DMF·3H 2 O] α, CP3 [{Cd(μ-3-bpna)(μ-hbtc)}·CH 3 OH·2H 2 O] α, CP4 [{Co(μ-3-bpna)(μ-ipa)}·DMF·2H 2 O] α, CP5 [{Co(μ-3-bpna)(μ-1,3-pda)}·DMF] α, CP6 [Cd(μ-3-bpna) 0.5 (μ-1,3-pda)] α, CP7 [(H 2 O)Co 0.5 (μ-3-bpna) 0.5 (μ-1,4-pda) 0.5 ] α, and CP8 [{Zn(μ-3-bpna)(μ-oba)}·DMF·2H 2 O] α, has been synthesized by reacting a hydrogen-bond-functionalized bis-pyridyl ligand, namely, N ′, N ″-di(pyridin-3-yl)naphthalene-2,6-dicarboxamide, with various transition metal salts and different di- or tricarboxylates (as co-ligand) displaying 2D and 3D network topology and having lattice-occluded solvents in the majority of cases. A 1D coordination polymer, namely, CP1 [{Ag 0.5 (μ-3-bpna)} 0.5 ·0.5BF 4 ·CH 3 CN] α, has also been isolated by reacting 3- bpna with AgBF 4 in the absence of any carboxylate co-ligand. All of the CPs were characterized by single crystal X-ray diffraction. Interestingly, two such CPs, namely, CP1 and CP2, produced metallogels, which were characterized by rheology, transmission electron microscopy, and X-ray powder diffraction. The metallogel of CP1 produced Ag nanoparticles within the gel bed upon exposure to light.