Structural and physicochemical characterization of zinc(II) and cadmium(II) complexes with 1,4‐dimethy‐lhomopiperazine

Cadmium and Mercury Complexes Containing Trinuclear Titanium Imido‐Nitrido Metalloligands

“…The Cd(1)-I(1) and Cd(1)-I(2) bond lengths [terminal 2.755(2) Å and bridging 2.791(1) Å, respectively] are similar to the values found in other compounds containing μ-I-bridged Cd 2 I 4 units. [15] These Cd-I bonds are approximately 0.8 Å shorter than the Cd(1)-I(2)a distance of 3.548(1) Å, which may be considered as a long-range interaction distance. Whereas the Cd (1) [16] the distance Cd(1)-N(23) [3.098(5) Å] is much longer, but it is still shorter than the sum of the van der Waals radii.…”

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

“…The lone pairs on the nitrogen atoms in the sp ligand take an sp 3 configuration, and they are well oriented for coordination to metal ion. Therefore, we have also carried out a fundamental study of zinc(II) and cadmium(II) complexes with sp and hp¢ [7,8]. All our complexes with sp and hp¢ are stable in air and their crystal structures showed the different effects on bidentate ligands between sp and hp¢.…”

“…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.…”

“…The sp complexes have a distorted tetrahedral geometry with MX 2 N 2 coordination which consists of two halide ligands and one sp ligand [8]. On the other hand, hp¢ can coordinate in two ways: monodentate or bidentate [7]. From these results, we selected sp and homopiperazine (hp), which is the precursor of hp¢, as bidentate ligands in order to stabilize MX 2 Y 2 (Y = S and O) type complexes in this study.…”

Crystal structure of the trinuclear complex hexachlorido-1κ3Cl,3κ3Cl-bis(µ2-dimethylphosphorylmethanamine-1:2κ2N:O,3:2κ2N:O)- bis(dimethylphosphorylmethanamine-2κ2N,O)trizinc(II), C12H40Cl6N4O4P4Zn3

“…Recrystallization from ethanol -byslow evaporation at 60°C -g ave needle shaped colourless crystals. The Ramanspectrum was measured using aneodymium doted yttrium-aluminum-garnet-laser (Nd:YAG) on aM ultiRam spectrometer from Bruker, 4000-60 cm -1 and 292 cm -1 can be assigned to Zn-Cl stretching frequencies whereas the broad signal at 279 cm -1 can be assigned to the Zn-N stretching frequencies [1,2]. IR spectroscopic data were collectedo naD igilab FT3400 spectrometer using aMIRacle ATR unit (Pike Technologies) 4000-560 cm the latest stages of the refinement using riding models and U iso values coupled to the U eq values of the parent atoms.…”