Novel copper(II) complexes of two tridentate ONN type ligands: Synthesis, characterization, electrical conductivity and luminescence properties

Herein, we describe the synthesis and characterization of two novel tridentate ONN donor ligands, namely, (E)-2-(((2-(dimethylamino)ethyl)imino)methyl)-6-methoxyphenol (HL1) and (E)-2-(((2-(dimethylamino)ethyl)imino)methyl)-6-ethoxyphenol (HL2), and their copper(II) complexes, [Cu2(L1)2(CH3COO)2] (1), [Cu(L2)(CH3COO)]·2H2O (2). They have been synthesized under conventional methods and characterized by elemental analysis, FT-IR, 1H NMR, 13C NMR, ICP-OES, TGA, DSC and GC/MS analysis. For the morphological analysis field emission scanning electron microscopy (FESEM) was used. The geometry of the Cu(II) complexes was determined by single crystal X-ray diffraction analysis. The Cu(II) ions are in distorted square-pyramidal coordination environments. 1 crystallizes in orthorhombic space group, Pbca, while 2 crystallizes in monoclinic space group, P21/c. Effects of different solvents and concentrations on the photoluminescence properties of the 1–2 were investigated. The emission bands bathochromically shifted due to increase of the dipole moments of EtOH to H2O and CHCl3 to DMSO, respectively. As a result of the dynamic quenching, the intensity of 1 was decreased with increasing the concentration in the water. The electrical conductivity complexes 1–2 have been also investigated. © 2018 Elsevier B.V.The authors gratefully acknowledge financial support from the Research Unit of Çukurova University (Grant No. FBA-2017-7794 ), and Scientific and Technological Research Application and Research Center, Sinop University, Turkey , for the use of the Bruker D8 QUEST diffractometer. Appendix