Ligand isomerism-controlled structural diversity of three new Cd(II) coordination polymers constructed by mixed dipyridyl-containing and benzenedicarboxylate ligands: syntheses, crystal structures, and photoluminescent properties

ABSTRACT

Three new cadmium coordination polymers, [Cd(1,2-BDC)(L₁)_0.5(H₂O)₂]_n(1), [Cd(1,2-BDC)(L₂) (H₂O)]_n (2) and {[Cd(1,3-BDC) (L₂)_0.5 (H₂O)]·H₂O}_n (3), have been successfully synthesized by the assembly of Cd²⁺ ion, isomeric dipyridyl [L₁ = 1,4-bis(4-pyridylmethyl) piperazine and L₂ = 1,4-bis(3-pyridylmethyl) piperazine], and isomeric dicarboxylate ligands [1,2-H₂BDC = 1.2-benzene dicarboxylic acid and 1,3-H₂BDC = 1.3-benzene-dicarboxylic acid], respectively. Complexes 1 and 2 all show 2D layer structures. The complex 3 displays 1D ladder-like structure. Furthermore, the luminescent properties of complexes 1–3 are investigated in solid state at room temperature.

KEYWORDS:

• Cadmium (II)
• crystal structure
• luminescent property