Zinc(II) and cadmium(II) coordination polymers with bis(4-pyridyl)benzylamine: structure and photoluminescence

Two coordination polymers, [(bpba)Zn(CH3COO)(2)](n) (1) and [(bpba)(3)Cd-2(NO3)(4)](n)center dot nMeOH center dot 4nH(2)O (2) (bpba = bis(4-pyridyl)benzylamine), were obtained using Zn(CH3COO)(2)center dot 2H(2)O/Cd(NO3)(2)center dot 4H(2)O and bpba in a mixture of solvents, and were further characterized. The zinc(II) ion of 1 showed a tetrahedral geometry with two oxygen atoms of the acetate ligands and two pyridine groups of the bpba ligands, and it is linked to the neighboring zinc(II) ions through the bpba ligands, giving rise to an interesting one-dimensional helical structure. Contrastingly, the cadmium(II) ion of polymer 2 was bonded by three pyridine groups of three different bpba ligands and four oxygen atoms of two nitrate ligands, exhibiting a T-shaped geometry. Thus, polymer 2 forms a two-dimensional wave-like structure by the coordination of cadmium(II) ion and bpba ligand to each other. Polymers 1 and 2 showed strong UV emissions depending on the metal ions and are red-shifted, compared to the bpba ligand.

Automated summary

The two coordination polymers, 1 and 2, exhibit different structural features with a one-dimensional helical structure and a two-dimensional wave-like structure, respectively. They both show strong UV emissions depending on the metal ions and are red-shifted compared to the bpba ligand.