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The title four-coordinate mononuclear complex, [Hg(C 3 H 5 OS 2 ) 2 (C 6 H 16 N 2 )] or [Hg(C 3 H 5 OS 2 ) 2 (tmeda)] (tmeda: N , N , N ', N '-tetra-methyl-ethane-1,2-di-amine), has a distorted tetra-hedral geometry. The Hg II ion is coordinated to two N atoms of the N , N , N ', N '-tetra-methyl-ethylenedi-amine ligand and two S atoms from two ethylxanthate xanthate ligands. In the crystal, mol-ecules are linked by weak C-H⋯S hydrogen bonds, forming a two-dimensional supra-molecular architecture in the ab plane. The most important contributions for the crystal packing are from H⋯H (59.3%), S⋯H (27.4%) and O⋯H (7.5%) inter-actions., (© Qadir et al. 2021.)

The reaction of copper(II) sulfatepentahydrate with 2-nitro-benzoic acid and N , N , N ', N '-tetra-methyl-ethylenedi-amine (TMEDA) in basic solution produces the complex bis-(2-nitro-benzoato-κ O )( N , N , N ', N '-tetra-methyl-ethylenedi-amine-κ 2 N , N ')copper(II), [Cu(C 7 H 4 NO 4 ) 2 (C 6 H 16 N 2 )] or [Cu(2-nitro-benzoate) 2 (tmeda)]. Each carboxyl-ate group of the 2-nitro-benzoate ligand is coordinated by Cu II atom in a monodentate fashion and two TMEDA ligand nitro-gen atoms are coordinate by the metal center, giving rise to a distorted square-planar coordination environment. In the crystal, metal complexes are linked by centrosymmetric C-H⋯O hydrogen bonds, forming ribbons via a R 2 2 (10) ring motif. These ribbons are linked by further C-H⋯O hydrogen bonds, leading to two-dimensional hydrogen-bonded arrays parallel to the bc plane. Weak π-π stacking inter-actions provide additional stabilization of the crystal structure. 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. The major inter-actions of the complex are O⋯H/H⋯O (44.9%), H⋯H (34%) and C⋯H (14.5%)., (© Kansiz et al. 2021.)

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.)

In the title compound, di-aqua-bis-(ethyl-enedi-amine-κ 2 N , N ')copper(II) bis-(2-nitro-benzoate), [Cu(C 2 H 8 N 2 ) 2 (H 2 O) 2 ](C 7 H 4 NO 4 ) 2 , two di-aqua-bis-(ethyl-enedi-amine)-copper(II) cations and four nitro-benzoate anions are present in the asymmetric unit. All four anions are 'whole-mol-ecule' disordered over two sets of sites. The major components have refined occupancies of 0.572 (13), 0.591 (9), 0.601 (9) and 0.794 (10). The Cu II ions exhibit slightly distorted octa-hedral geometries. In the crystal, cations and anions are connected to each other via N-H⋯O and O-H⋯O hydrogen bonds, forming a two-dimensional network parallel to (200). The inter-molecular contacts in the crystal were further analysed using Hirshfeld surface analysis, which indicates that the most significant contacts are O⋯H/H⋯O (42.9%), followed by H⋯H (35.7%), C⋯H/H⋯C (14.2%), C⋯C (2.9%), C⋯O/O⋯C (2.2%), N⋯H/H⋯N (0.9%) and N⋯O/O⋯N (0.3%)., (© Qadir et al. 2020.)

In the title compound, (2,2'-bi-pyridine-κ 2 N , N ')bis-(2-meth-oxy-ethyl xanthato-κ S )zinc(II), [Zn(C 4 H 7 O 2 S 2 ) 2 (C 10 H 8 N 2 )], the Zn II ion is coordinated to two N atoms of the 2,2'-bi-pyridine ligand and two S atoms from two 2-meth-oxy-ethyl xanthate ligands. The Zn II ion lies on a crystallographic twofold rotation axis and has distorted tetra-hedral coordination geometry. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds, forming supramolecular chains propagating along the a -axis direction. Weak intra-molecular C-H⋯S hydrogen bonds are also observed. The inter-molecular contacts in the crystal were further analysed using Hirshfield surface analysis, which indicates that the most significant contacts are H⋯H (36.3%), followed by S⋯H/H⋯S (24.7%), C⋯H/H⋯C (15.1%), O⋯H/H⋯O (14.4%), N⋯H/H⋯N (4.1%) and C⋯C (2.9%)., (© Qadir et al. 2019.)