This work describes the synthesis and the crystal structure of a copper(II) complex – [Cu(HL)(NO3)2]·H2O – based on 2-acetylpyridine-benzoylhydrazone ligand (HL). In the complex, copper(II) is five-coordinate with two nitrate ligands
and a tridentate NNO-donor. The copper center has square pyramidal geometry with an axial nitrate and the equatorial positions occupied by another nitrate and the hydrazone. Besides X-ray studies, the complete structural characterization includes elemental analysis, IR, and UV–vis spectroscopy.
Plane wave and localized basis set calculations support the distorted square pyramidal geometry. Theoretical calculations using several DFT functionals were used to study the performance of functionals for this complex. Solvent effect was studied on optimized geometries allowing better support
to its spectroscopic data. Noncovalent π…π stacking interactions were also analyzed.
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