Halide-ion directed assembly of distinct CdII coordination polymers with 3,5-bis(4-pyridyl)-4-(3-pyridyl)-1,2,4-triazole and azide

•Two CdII coordination polymers have been synthesized and well characterized.•The structural distinction can be ascribed to the usage of different halide anions.•The solid-state properties for both complexes have been investigated.

Two CdII coordination polymers, namely {[Cd(L434)(Br)(N3)](H2O)1.75}n (1) and [Cd(L434)(I)(N3)(H2O)]n (2) (L434 = 3,5-bis(4-pyridyl)-4-(3-pyridyl)-1,2,4-triazole) have been synthesized by reaction of L434 with CdBr2 or CdI2 in the presence of NaN3 under the same conditions. Single-crystal X-ray diffraction analyses indicate that complex 1 shows a 3D coordination network with unusual gra topology, whereas 2 has a 1D ladder-like coordination chain. The structural distinction on the two complexes, including the different coordination environments of CdII and binding modes of L434 and N3−, can be ascribed to the usage of different halide anions from Br− to I−. In addition, the solid-state properties for complexes 1 and 2 such as thermal stability and fluorescence properties have also been investigated.

Graphical abstractTwo CdII coordination polymers, namely {[Cd(L434)(Br)(N3)](H2O)1.75}n (1) and [Cd(L434)(I)(N3)(H2O)]n (2) (L434 = 3,5-bis(4-pyridyl)-4-(3-pyridyl)-1,2,4-triazole) have been synthesized by reaction of L434 with CdBr2 or CdI2 in the presence of NaN3 under the same conditions. Complex 1 shows a 3D coordination network with unusual gra topology, whereas 2 has a 1D ladder-like coordination chain. The structural distinction on the two complexes, including the different coordination environments of CdII and binding modes of L434 and N3−, can be ascribed to the usage of different halide anions from Br− to I−.Figure optionsDownload full-size imageDownload as PowerPoint slide