Anion-Dependent Cu(II) Coordination Polymers: Geometric, Magnetic and Luminescent Properties
oleh: Ihsan Ullah, Jong Won Shin, Ryuya Tokunaga, Shinya Hayami, Hye Jin Shin, Kil Sik Min
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-08-01 |
Deskripsi
A one-dimensional (1D) coordination polymer [Cu<sub>2</sub>(bpba)(CH<sub>3</sub>COO)<sub>4</sub>] (<b>1</b>) and a two-dimensional (2D) coordination polymer [Cu(bpba)<sub>2</sub>(H<sub>2</sub>O)(NO<sub>3</sub>)](NO<sub>3</sub>)∙2H<sub>2</sub>O∙MeOH (<b>2</b>) were synthesized by the reaction between Cu(CH<sub>3</sub>COO)<sub>2</sub>∙H<sub>2</sub>O/Cu(NO<sub>3</sub>)<sub>2</sub>∙3H<sub>2</sub>O and bis(4-pyridyl)benzylamine (bpba). The Cu(II) ions of <b>1</b> and <b>2</b> have distorted-square pyramidal coordination with a paddle-wheel structure and an octahedral geometry, respectively. By coordinating the Cu(II) ions and bpba ligands, <b>1</b> and <b>2</b> formed zigzag 1D and puckered 2D coordination polymers, respectively. Polymer <b>1</b> exhibits strong emissions at 355 and 466 nm, whereas polymer <b>2</b> exhibits strong emissions only at 464 nm. The emissions are strongly dependent on the geometry of the Cu(II) ions linked by the bpba and anionic ligands. Polymer <b>1</b> exhibits a very strong antiferromagnetic interaction within the paddle-wheel dimer, whereas polymer <b>2</b> exhibits a very weak antiferromagnetic interaction through the bpba linkers and/or space.