Video: Coordination Number and Geometry GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes Synthesis, crystal structures and supramolecular architectures of square pyramidal Cu(II) complexes containing aromatic chelating N,N' donor ligands BMC Chemistry Springer Nature Link For the complexes showing the square pyramidal structure, the d orbital involved in the hybridis GHK Cu: The Copper Peptide That's Rewriting the Rules of Regeneration Square pyramidal Cu(II) acylpyrazolone complex: Synthesis, characterization, crystal structure, DFT and Hirshfeld analysis, in vitro anti cancer evaluation ScienceDirect