Mixed ligand Cd(II) coordination architectures based on bulky anthracene-9-carboxylate ligand: Crystal structures and optical properties

The reaction of cadmium nitrate with anthracene-9-carboxylic acid (HL) and two terpyridine derivatives, 4 ' phenyl-2,2 ':6 ',2 ''-terpyridine (L1) and 4 '-(4-pyridyl)-2,2 ':6 ',2 ''-terpyridine (L2), led to the formation of two mixed-ligand coordination compounds, [Cd(C21H15N3)(C15H9O2)2] (1) and [Cd2(C20H14N4)2.5(C15H9O2)4]n (2). Coordination compounds were characterized by single-crystal X-ray diffraction, elemental analysis, FT-IR, UV-Vis and luminescence spectroscopy. X-ray analysis of prepared coordination compounds reveals that 1 is single nuclear coordination complex, whereas 2 is a one-dimension coordination polymer with zigzag chain structure. The nature of L1 and L2 ligands has an essential influence on the molecular geometry and assembly, as well as on the physicochemical properties of complexes 1 and 2. Finally, 1D polymer 2 was utilized as a precursor for the fabrication of an organic light-emitting diode (OLED@2) whose emission wavelengths were investigated at different voltage.