The first salamo-type mixed-ligand Cu(II) coordination polymer: Synthesis, crystal structure and theoretical studies

In this work, a copper(II) coordination polymer [Cu-2(L-1)(L-2)(NO3)](n)center dot nCH(3)OH (Cu(II)-CP) with different structures of mixed salamo-type ligands was constructed for the first time. Single crystal X-ray diffraction analysis showed that the Cu(II)-CP asymmetric unit consists of two copper(II) atoms, fully deprotonated (L-1)(-), (L-2)(2-) ligand units, one NO3- anion and one molecule of crystallized methanol. The two metallized ligand units are bridged by two oxygen atoms of NO3- to form unique mixed-ligand copper(II) coordination polymer. In addition, the six coordination atoms around the two Cu(II) atoms are all arranged in a distorted octahedral geometry. In the molecular structure of Cu(II)-CP, neighbouring molecules interact through intermolecular hydrogen bonds to form a two-dimensional supramolecular structure. Intermolecular interactions and molecular stability were further investigated by Hirshfeld surface analysis and other theoretical calculations. Finally, the antimicrobial activities of both ligands and Cu(II)-CP were investigated and found to exhibit excellent antibacterial activities.

Automated summary

In this study, a copper(II) coordination polymer Cu(II)-CP with mixed salamo-type ligands was constructed for the first time. The structure of Cu(II)-CP consists of two copper(II) atoms, deprotonated ligand units, a NO3- anion, and a crystallized methanol molecule. The two metallized ligand units are bridged by two oxygen atoms of NO3- to form a unique mixed-ligand copper(II) coordination polymer. The antimicrobial activities of both ligands and Cu(II)-CP were investigated and found to exhibit excellent antibacterial activities.