Structural and Infrared Spectroscopic Studies of Some Adducts of Divalent Metal Dihalides (MX₂, M = Zn, Cd; X = CI, Br, I) with Variously Hindered Monodentate Nitrogen (Pyridine) Base Ligands (L = Pyridine, 2‐Methylpyridine, and Quinoline) of 1:2 Stoichiometry

Abstract

Single crystal X-ray structure determinations are described for a number of adducts of 1:2 MX 2 :L stoichiometry, [M = divalent metal (Zn, Cd); X = halide (Cl, Br, I), L = (variously hindered) monodentate nitrogen (pyridine) base: py = pyridine, 2-mpy = 2-methylpyridine, quin = quinoline]: [(2-mpy) 2 ZnX 2 ] (X = Cl, Br) (isotypic, triclinic P1, a ≈ 7.9 6 , b ≈ 8.7, c ≈ 11.4 Å, α ≈ 86, β ≈ 79.3, γ ≈ 67°, Z = 2), [(2-mpy) 2 ZnI 2 ], [(quin) 2 ZnX 2 ] (X = Br) (isotypic with the previously determined chloride, X = Cl, triclinic, P1, a ≈ 8.7, b ≈ 9.6, c ≈ 11.1 Å, α ≈ 81, β ≈ 73, γ ≈ 72°, Z = 2); [(quin) 2 ZnI 2 ]; [(2-mpy) 2 CdX 2 ], X = Br {isotypic with [(2-mpy) 2 ZnX 2 ], X = Cl, Br (above)}, X = I {isotypic with [(2-mpy) 2 ZnI 2 ] (above)}; [(quin) 2 CdI 2 ]. A single molecule, with a four-coordinate quasi-tetrahedral metal atom, N 2 MX 2 , comprises the asymmetric unit of the structure in each of these. A one-dimensional * Prof. G. A. Bowmaker Fax: +64-9-3737422 E-Mail: ga.bowmaker@auckland.ac.nz [a]

Solvothermal Preparation, Crystal Structure, and Photoluminescence of a Cadmium Compound With a Two-Dimensional Supramolecular Layer

“…The bond distances of Cd-Br are 2.5545(14) and 2.5876(8) A , which are normal and comparable with those previously reported. [8][9][10][11] The bond angles of Br-Cd-Br are 109.356 (16) and 109.587 (16) , which are very close to the value for a regular tetrahedron. Each Cd2 atom binds to three Cl2 atoms with the bond lengths of Cd-Cl being of 2.5693(11) A , yielding a CdCl 3 moiety.…”

Zn(II) Heteroleptic Halide Complexes with 2-Halopyridines: Features of Halogen Bonding in Solid State

“…Solvents were purified according to the standard procedures. Complexes 10 – 12 were prepared similarly to the procedure described earlier [ 46 ], (corresponding Zn(II) halide and 2-MePy (1:2) in ethanol) and identified by PXRD and element analysis data. All experiments were performed at room temperature.…”

Structures and trends of one-dimensional halide-bridged polymers of five-coordinate cadmium(ii) and mercury(ii) with benzopyridine and -pyrazine-type N-donor ligands

“…20,25 No Cd-I⋯Cd-I close contacts are observed in the structure. The compounds EYETOS, EYERUW and EYESEH were all synthesised and structurally characterised by Bowmaker et al 14 The said compounds all contain Cd 2+ as the cationic metal centre and quinoline as the coordinated N-donor ligand, but differ with regard to the coordinated halide ligands, which are chloride, bromide and iodide, respectively. EYETOS crystallises in the orthorhombic space group P42 1 c. The Cd 2+ metal centre adopts an octahedral geometry with two N-donor ligands coordinated trans to each other in the axial positions of the said sphere, while the four chloride ligands coordinate in the equatorial plane and partake in edge-sharing to connect the adjacent octahedra into a onedimensional halide-bridged chain.…”

“…Table 1 14 which are available in the literature and will be included in the structural comparison. The effort leans toward correlating the obtained structural types with the variable components, M, X and L, to be able to formalise trends identifiable within the current set of structures as well as related structures from the literature.…”

“…The abbreviation [MIJμ-X) 2 IJL)] ∞ will be employed to label the halide-bridged polymers, with M indicating the metal ion, X the halide anion and L = acr, phe or quin. Table 1 also includes related structures EYETOS, 14 EYERUW 14 and EYESEH, 14 which are available in the literature and will be included in the structural comparison.…”