Abstract
The reaction of cadmium iodide with 2,3-di-methyl-pyrazine leads to the formation of two compounds with the compositions [CdI(2)(C(6)H(8)N(2))(2)] or [CdI(2)(2,3-di-methyl-pyrazine)(2)] (1) and [CdI(2)(C(6)H(8)N(2))] (n) or [CdI(2)(2,3-di-methyl-pyrazine)] (n) (2). The asymmetric unit of 1 is built up of one Cd(II) cation as well as two iodide anions and two 2,3-di-methyl-pyrazine ligands representing complete mol-ecules. The Cd(II) cations are tetra-hedrally coordinated, forming discrete complexes that are connected via weak C-H⋯I inter-actions. The asymmetric unit of 2 consists of one Cd(II) cation and two crystallographically independent iodide anions that are located on a crystallographic mirror plane, as well as one 2,3-di-methyl-pyrazine ligand that is located on a twofold rotation axis. The Cd(II) cations are tetra-hedrally coordinated by two iodide anions and two 2,3-di-methyl-pyrazine ligands into corrugated chains. As in 1, inter-molecular C-H⋯I inter-actions are observed. Comparison of the experimental powder patterns with those calculated from single-crystal data proves that pure compounds have been obtained. The crystal structures are compared with those of related MX (2) (M = Zn, Cd, X = Cl, Br, I) coordination compounds with pyrazine and 2,3-di-methyl-pyrazine, that are reported in the literature.