Spectral and Geometrical Study of Two Cadmium Complexes, mer-R,S-[Cd(aepn)₂]X₂ (X: I., Cl., aepn: N-(2-Aminoethyl)-1,3-propanediamine) Supported by Solution Experiments

In this research, two new complexes of N-(2-aminoethyl)-1,3-propanediamine (aepn), [Cd(aepn)₂]I₂ (1) and [Cd(aepn)₂]Cl₂·H₂O (2), were prepared and identified by elemental analysis, FT-IR, Raman spectroscopy and single-crystal X-ray diffraction. Geometry around the cadmium atom in two complexes by coordination of six nitrogen atoms of two aepn is distorted octahedral. If distortion in the mer-[Cd(aepn)₂]²⁺ cation is disregarded, it has a C₂ axis and C₂ symmetry. The cyclic voltammetry experiments were carried out to study the complexation process. Two structural surveys on coordination modes and complexes of aepn are presented. A study was carried out using CSD data to estimate the averages of bond lengths for different types of the Cd-N bonds. It was found that the intermolecular N-H···I, C-H···I hydrogen bonds in 1 and N-H···Cl, N-H···O, C-H···O, O-H···Cl in 2 stabilized the crystal networks