Crystal structure and Hirshfeld surface analysis of one-dimensional copper(II) coordination polymer incorporating succinate and tetramethylethylenediamine ligands

The reaction of copper nitrate with succinic acid (succH) and N,N,N',N'-tetramethylethylenediamine (TMEDA) in basic solution produces the complex catena-poly[[[(N,N,N',N'-tetramethylethylenediamine-? N,N')copper(II)]-µ-succinato-? O 1:O 4] tetrahydrate], {[Cu(C4H4O4)(C6H16N2)]·4H2O} n or {[Cu(succ)(tmeda)]·4H2O} n. Each carboxylate group of the succinate ligand coordinates to a CuII atom in a monodentate fashion, giving rise to a distorted square-planar geometry. The succinate ligands bridge the CuII centres, forming one-dimensional polymeric chains. Hydrogen bonds between the ligands and water molecules 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 intermolecular contacts within the supramolecular structure.