Four series of lanthanide coordination polymers based on the tetrabromobenzene-1,4-dicarboxylate ligand: structural diversity and multifunctional properties

Synthesis, crystal structure and properties of poly[di-μ3-chlorido-di-μ2-chlorido-bis-[4-methyl-N-(pyridin-2-yl-methyl-idene)aniline]dicadmium(II)]

The title coordination polymer with the 4-methyl-N-(pyridin-2-yl-methyl-idene)aniline Schiff base ligand (L, C13H12N2), [Cd2Cl4(C13H12N2)] n (1), exhibits a columnar structure extending parallel to [100]. The columns are aligned in parallel and are decorated with chelating L ligands on both sides. They are elongated into a supra-molecular sheet extending parallel to (01) through π-π stacking inter-actions involving L ligands of neighbouring columns. Adjacent sheets are packed into the tri-periodic supra-molecular network through weak C-H⋯Cl hydrogen-bonding inter-actions that involve the phenyl CH groups and chlorido ligands. The thermal stability and photoluminescent properties of (1) have also been examined.

Crystal structure of a new europium(III) compound based on thio-phene-acrylic acid

A europium(III) coordination compound based on thio-phene-acrylic acid (Htpa), tri-aqua-tris-[3-(thio-phen-2-yl)prop-2-enoato-κ² O,O']europium(III)-3-(thio-phen-2-yl)prop-2-enoic acid (1/3), [Eu(C₇H₅O₂S)₃(H₂O)₃]·3C₇H₆O₂S or [Eu(tpa)₃(H₂O)₃]·3(Htpa) (1), where tpa is the conjugate base of Htpa, has been synthesized and structurally characterized. Compound 1 crystallizes in the trigonal space group R3. The structure of 1 consists of a discrete mol-ecular complex [Eu(tpa)₃(H₂O)₃] species and the Htpa mol-ecule. In the crystal, the two components are involved in O-H⋯O [ring motif R ₂ ²(8)] and C-H⋯π hydrogen-bonding inter-actions. These inter-actions were further investigated by Hirshfeld surface analysis, which showed high contributions of H⋯H, H⋯C/C⋯H and H⋯O/O⋯H contacts to the total Hirshfeld surfaces.