Mixed-ligand Cu(II) complex with general formula of [Cu(Phen)2Cl].H2L,Cl,H2O (Figure) is prepared by reaction of Cu(OAc)2.H2O, 1,10-phenanthroline and salicylaldehyde S-benzylisothiosemicarbazone.hydrogenchloride (H2L) in a 1:2:1 mol ratio. Its structure is characterized by elemental, IR and single crystal X-ray diffraction analyses which are precisely used to better understand the molecular structure of the complex. Coordination geometry around the central atom in the Cu(II) complex, is a distorted square-pyramidal. Two 1,10-phenanthroline ligands (NN donor) are coordinated to the central metal as bidentate neutral agents and the last position is occupied by the chlorine atom. Moreover, there are one salicylaldehyde S-benzylisothiosemicarbazone free ligand, a water molecule and a chlorine atom in the crystal lattice.

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