Group 12 metal(II) complexes with 1-methylimidazoline-2(3H)-thione (mitH): correlation between crystal structure and physicochemical property

Synthesis and Crystal Structures of Cadmium Iodide Complexes of N,N′-Diethylthiourea and 1,3-Diazinane-2-thione

“…In both complexes, the Cd-S and Cd-I bond lengths (Table 3) are in agreement with those reported for related compounds [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The SCN 2 moieties are essentially planar with bond lengths corresponding to values intermediate between single and double bonds.…”

“…However, in both the cadmium atoms have distorted tetrahedral geometries and the thiourea ligands coordinate through the sulfur atom in a monodentate terminal mode. Although 2 is isostructural with several other cadmium iodide complexes reported previously [13,15,18,22], the compound 1 is unique in the sense that it consists of three independent molecules in the asymmetric unit, each of which to some extent has completely different geometry.…”

“…In view of this, cadmium(II) complexes of thiones have been widely studied in recent years [8][9][10][11][12][13][14][15][16]. The structural studies on cadmium(II) halide complexes of thiones describe that in most of the cases the structures consist of discrete mononmeric molecules with cadmium adopting a somewhat distorted tetrahedral coordination geometry [11][12][13][14][15][16][17][18][19][20][21][22][23]. In some cases, polymeric structures are obtained through sulfur and halide bridging consisting of [CdS 3 X 3 ] distorted octahedra [18,19].…”

“…The structural studies on cadmium(II) halide complexes of thiones describe that in most of the cases the structures consist of discrete mononmeric molecules with cadmium adopting a somewhat distorted tetrahedral coordination geometry [11][12][13][14][15][16][17][18][19][20][21][22][23]. In some cases, polymeric structures are obtained through sulfur and halide bridging consisting of [CdS 3 X 3 ] distorted octahedra [18,19]. Whereas the complexes of cadmium halides are usually neutral, with cadmium(II) nitrate or sulfonate, ionic complexes of the type [CdL 4 ]X 2 are also known [24,25].…”

Synthesis and physicochemical characterization of zinc(II) and cadmium(II) complexes with simple ligands

“…We are interested in spectroscopic model complexes of zinc(II) and cadmium(II) ions with ''simple'' supporting ligands, which have an imidazole ring or do not contain any aromatic rings or multiple bonds [6][7][8][9][10]. We have demonstrated that the ''simple'' supporting ligands are useful to study spectroscopic assignments related to the metal and coordination atoms in the MX 2 S 2 complexes containing 1-methylimidazoline-2-thione (mitH) [MX 2 (mitH)] (M = Zn II or Cd II ; X = Cl, Br or I) [6], MX 2 N 2 complexes containing 1,4-dimethylhomopiperazine (hp¢) [MX 2 (hp¢)] (M = Zn II or Cd II ; X = Cl, Br or I) [7] and ( ) ) sparteine (sp) [MX 2 (sp)] (M = Zn II or Cd II ; X = Cl, Br or I) [8] and homoleptic thiolato complexes [(Et 4 N)[Zn(SC 10 H 15 ) 3 ] (HSC 10 H 15 = 1-adamantanethiol), (NEt 4 ) 2 [{Zn(SC 6 H 11 ) 2 } 2 (l-SC 6 H 11 ) 2 ] and (NEt 4 ) 2 [{Cd(SC 6 H 11 )} 4 (l-SC 6 H 11 ) 6 ] (HSC 6 H 11 = 1-cyclohexanethiol)] [9,10]. It is well known that zinc(II) takes a variety of coordination types such as N 2 S 2 , N 2 O 2 and others in the biological systems.…”