Synthesis and structural characterization of three new isomorphous coordination compounds, fabricated from CdHal2 (Hal = Cl, Br, I) and a bulky helical organic ligand 1,2-diphenyl-1,2-bis((phenyl(pyridin-2-yl)methylene)hydrazono)ethane (L), namely [CdHal2L] (Hal = Cl (1), Br (2), I (3)), are reported. The ligand L is coordinated in a tetradentate coordination mode via two pyridyl-imine units, yielding the 12 π electron chelate ring. Herein, we indicated that using the pyridine based bulky ligand along with CdHal2 salts led to formation of desirable helical metallo-organic molecules with octahedral geometry. It was found that all the structures exhibit intermolecular π⋯π stacking and CH⋯π interactions. The Hirshfeld analysis indicated that the H⋯X (X = H, C and Hal) contacts are highly favoured in 1–3. The optical properties of 1–3 have been investigated by diffuse reflectance spectroscopy.
