Zinc and cadmium iodide complexes with (thio)amides: Transformations of formamide complexes and effects of substitution on structure and bonding

摘要

Complexes of formamide and dimethylacetamide with cadmium iodide, [Cd(HCONH_2)_2I_2], [Cd(HCONH_2)_4- I_2], [Cd_3(HCONH_2)_2I_6], and [Cd(MeCONMe_2)_6][Cd_2I_6] and of 5-acetyl-6-methyl-1,2,3,4-tetrahydropyrimidine- 2-thione (MP) with zinc iodide, [Zn(MP)(H_2O)I_2], were synthesized; their crystal structures were studied by X-ray diffraction. Unique transformations of cadmium iodide complexes with formamide were observed. Structural diversity of zinc and cadmium iodide complexes with (thio)amides is discussed in terms of donating ability of the ligands, steric requirements and sizes and polarizing power of the cations.