Crystal structure and Hirshfeld surface analysis of one-dimensional copper(II) coordination polymer incorporating succinate and tetra-methyl-ethylene-diamine ligands.

The reaction of copper nitrate with succinic acid (succH) and N , N , N ', N '-tetra-methyl-ethylenedi-amine (TMEDA) in basic solution produces the complex catena -poly[[[( N , N , N ', N '-tetra-methyl-ethylenedi-amine-κ ² N , N ')copper(II)]-μ-succinato-κ ² O ¹ : O ⁴ ] tetra-hydrate], {[Cu(C ₄ H ₄ O ₄ )(C ₆ H ₁₆ N ₂ )]·4H ₂ O} _n or {[Cu(succ)(tmeda)]·4H ₂ O} _n . Each carboxyl-ate group of the succinate ligand coordinates to a Cu ^II atom in a monodentate fashion, giving rise to a distorted square-planar geometry. The succinate ligands bridge the Cu ^II centres, forming one-dimensional polymeric chains. Hydrogen bonds between the ligands and water mol-ecules link these chains into sheets that lie parallel to the ac plane. Hirshfeld surface analysis, d _norm and two-dimensional fingerprint plots were examined to verify the contributions of the different inter-molecular contacts within the supra-molecular structure.
(© Qadir et al. 2020.)