Electrochemical Coupling of Aromatic Halide Catalyzed by Nickel Complex, Mechanism and Kinetics; Synthesis and Chemiluminescence Study of Symmetrically Phenylethynyl Substituted Fused Aromatic Hydrocarbons 镍催化卤代芳烃的电化学偶联及其机理和动力学研究含对称苯乙炔基稠环芳烃化合物的合成及化学发光研究