Three cadmium-5,7-disulfonate-1,4-naphthalenedicarboxylate coordination polymers: syntheses, structures and photoluminescence

Abstract

Three cadmium(II) coordination polymers constructed from 5,7-disulfonate-1,4-naphthalenedicarboxylate and N-containing ligands, {[Cd₂(DSNPDC)(phen)(H₂O)₄]·2.5H₂O}_n (1), {[Cd₂(DSNPDC)(phen)₂(H₂O)₄]·3H₂O}_n (2) and [Cd₂(DSNPDC)(bpy)₂(H₂O)₄]_n (3) (H₄-DSNPDC = 5,7-disulfonate-1,4-naphthalenedicarboxylic acid, phen = 1,10-phenanthroline, and bpy = 2,2′-bipyridine), were synthesized and characterized. Compound 1 displays a two-dimensional (2D) layered structure. In 2 and 3, the dinuclear [Cd₂(COO)₂] units are connected by DSNPDC^4– ligands to generate one-dimensional (1D) chains. Due to the presence of the terminal chelating phen/bpy ligands, all compounds show low dimensional structures. Compounds 1–3 exhibit fluorescence emissions centered at 378, 419 and 376 nm, respectively, which are assigned to ligand-centered emissions or ligand-to-metal charge transfer.

Graphical Abstract

Keywords:

• Cadmium compound
• 5,7-disulfonate-1,4-naphthalenedicarboxylate
• crystal structure
• photoluminescence

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Crystallographic data (including structure factors) for the structures in this paper have been deposited with the Cambridge Crystallographic Data Centre, CCDC, 12 Union Road, Cambridge CB21EZ, UK. Copies of the data can be obtained free of charge on quoting depository numbers CCDC-2017131-2017133 (http://www.ccdc.cam.ac.uk).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (21861020) and the Jiangxi Provincial Natural Science Foundation of (20204BCJL22043 and 20202BAB203002).