Synthesis And Photophysical Properties Of Pt(Ⅱ)and Pd(Ⅱ) Phosphorescent Compounds Of Phenylpyridine

In recent years,more and more new metal-organic phosphorescent compounds have been gradually synthesized and applied to organic light-emitting devices（OLED）,in vivo imaging,optical sensors and other fields.The square Pt（Ⅱ）com-plexes have excellent photophysical properties mainly because of some interactions between their molecules,such asπ-πstacking and metal-metal bonds in the solid state.As for double-decker Pd（Ⅱ）complexes,they have a wide range of applications in the field of catalysts,and their applications in the field of luminescent materials has not been reported yet.In this paper,we focused on the research of related Pt（Ⅱ）diimide complexes and bimetallic Pd（Ⅱ）dimers,new compounds were designed and synthesized and their photophysical properties were studied.The main research contents are listed as follows:1.In this paper,three charged neutral Pt（Ⅱ）diimide complexes were designed by introducing the closo-monocarborane clusters[CB₁₁H₁₂]^-.These compounds were characterized by nuclear magnetic resonance（NMR）and high-resolution mass spec-trometry（HR-MS）.The single crystal data of these compounds show that the spatial structures are square planar configuration,and there areπ-πstacking and metal-metal interaction between molecules in solid state.The quantum yield of compound1 and compound 2 in solid state were higher than those of the corresponding ionic compounds,and the quantum yield of compound 1 in solid states reached 41%.In this paper,compound 1 was also spin coated on quartz chips,and it was found that it can be quenched in a closed space filled with acetonitrile vapor,which shows the potential application value of compound 1 in the field of acetonitrile detection.2.Eight new Pd（Ⅱ）dimers were synthesized by introducing N,N’-Diphenylfor-mamidine and 3,5-di-tert-butyl-1H-pyrazole,eight novel metal Pd（Ⅱ）dimers were synthesized by reacting with metal Pd（Ⅱ）carboxylic acid dimers and they have ob-vious luminescence at room temperature.These compounds have been characterized by structural properties.The single crystal data show that the compounds have a double-decker structure,and the distance between Pd and Pd is in the range of2.8131（3）（?）～2.8819（4）（?）.Compound 3A achieves the phosphorescent quantum yield of 59%in solid state.This study has great significance to the research of new Pd（Ⅱ）luminescent materials.In this paper,three intramolecular charge neutral Pt（Ⅱ）complexes were synthe-sized by introducing closo-monocarborane clusters into platinum complexes,which have potential applications in acetonitrile detection;And 8 novel metal Pd（Ⅱ）dimers were designed and synthesized,demonstrating their potential applications in the field of metal organic light-emitting diodes.Studied the synthesis and characteriza-tion,analysis of photophysical properties and their potential application value of these compounds.This paper provides the new ideas for the design and synthesis of new phosphorescent materials.