| In the past decade, conjugated molecules, have been utilized as a building unit widely used as organic ligands to synthesize the luminescent complexes and construct metalorganic frameworks, because of their excellent photoluminescent properties. Researchers have studied a lot of conjugated organic molecules, for example, pyrene and porphyrinbased molecules. Compared to these free conjugated molecules, the metal-organic materials prepared from the related ligands usually display high quantum yield because the coordination interactions between the metal ions and ligands could increase the rigidity of organic molecules and thus non-radiation loss of energy could be reduced.On the other hand, transition metal complexes with d10 electronic configuration, especially Cu(I) or polynuclear Cu(I) complexes have attracted long standing interest due to their interesting photophysical behavior and a low price. Among them, cuprous halides or pseudohalides have been extensively explored as metal centers and building units to prepare luminescent complexes and construct coordination networks. Recently a series of dinuclear cuprous halide complexes bridged by P^N ligands with high quantum yield in solid state have been prepared, which are possibly applied in OLEDs.Based on the study of those works, our group combinated conjugated organic molecules with good fluorescence properties and transition metal ions with d10 electronic configuration, designing highly luminescent materials. Using Sonogashira techniques, 4,6-dibromodibenzothiophene was chosen as a precursor in this work to design a new luminescent organic ligand containing large conjugated system 4, 6-di(3-pyridylethynyl)dibenzothiophene(L). Herein a class of new cuprous halide complexes of 4, 6-di(3-pyridylethynyl)dibenzothiophene(L) are reported, namely, Cu4I4L2(1), Cu2Br2L2(2) and [L12(CuCN)8] n(3), respectively. X-ray structure analysis revealed that in(1): two 4, 6-di(3- pyridylethynyl)dibenzothi- ophene molecules indeed coordinate a tetrameric aggregate Cu4I4 as chelating ligands; in(2), centers are bridged by two Br anions with the long Cu… Cu distance. Like a chairs; in(3), the Cu(I) ions are connected by cyanide anions to afford zigzag chains, and there are eight independent Cu-CN-Cu chains in asymmetric unit. This new binding mode of the ligand results in generating a chiral 3 D coordination network. At room temperature, they show strong fluorescence properties.The aim of this study is to explore the way to prepare highly luminescent complexes, and the effect of anions and week interactions between the conjugated systems on the structures and luminescent properties of complexes. |
