Nanorod formation, Hirshfeld surface analysis, and electrical properties of a Cu (II) coordination polymer

A copper(II) coordination polymer, [Cu(μ-Cl)(μ-OCH 3 )(2-apy)] n ·CH 3 OH, was reinvestigated to explore its nanostructural characteristics, intermolecular interactions, and electrical properties. Although the crystal structure has been reported previously, this study demonstrates the formation of well-defined anisotropic nanorods through a controlled solvothermal synthesis. Scanning electron microscopy revealed densely packed nanorods with diameters of approximately 30–50 nm and lengths of up to 2 μm. Powder X-ray diffraction confirmed phase purity and structural consistency between the bulk and nanocrystalline materials, with an estimated average crystallite size of approximately 23 nm. Hirshfeld surface analysis of the coordination polymer framework quantified the principal intermolecular contacts responsible for crystal packing, while electrical conductivity measurements revealed semiconducting behavior with conductivity values in the range of 10 −8 –10 −6 S cm −1 . The observed charge transport may be associated with π–π stacking interactions and metal–ligand charge-transfer pathways within the polymeric framework. These findings establish a relationship between crystal structure, nanoscale morphology, intermolecular interactions, and electrical properties, providing new insight into the functional characteristics of the Cu(II) coordination polymer.