Study On Synthesis, Characterization And Properties Of Organometallic Complexes Of The Noble Metals Iridium And Platinum And Gold

Organometallic complexes of the noble metals,due to their unique physicochemical property, have important applications in optoelectronic materials, catalysis, metal-organic chemical vapor deposition and other fields. This dissertation will focus on the development of cyclometalated iridium complexes as phosphorescent materials, chlorine-free and water-soluble platinum complexes as precursors for supported paltinum catalysts as well as dimethygold iodide as intermediates for other organometallic compounds.A series of red phosphorescent iridium(III) complexes have been designed, synthesized and characterized by MS and NMR. These complexes include Ir(piq)3,(piq)2Ir(acac),(piq)2Ir(tmd), Ir(phq)3,(phq)2Ir(acac) and(piq)2Ir(tmd) where piq stands for 1-phenylisoquinoline, phq for 2-phenylquinoline, acac for acetylacetone, tmd for 2,2,6,6-tetramethyl-3,5-heptanedionate. The complexes were evaluated for their photoluminescence profile by using UV-vis absorption and fluorescence spectrometry. The competitive behavior was investigated between piq and ppy(or mppy) during synthesis process of Ir(C^N)3. the product was characterized and confirmed by 1H NMR and mass spectrum. These complexes were also found, by using cyclic voltammetric test, to be able to reduce the proton in acetic acid, showing an electrocatalytic property.Two water-soluble complexes featuring [Pt(NH3)4]2+ as a cation and common dicarboxylate(oxalate or malonate) as counter anion have been synthesized, characterized and evaluated for their thermo-chemical profile. The complexes can be easily synthesized in a yield of about 85% from K2 Pt Cl4 via a series of ligand substitution reactions at mild temperatures and under normal pressures. The thermolysis temperatures and products both in inert and oxidative atmosphere were determined by TG-DTA along with GC-MS. Two complexes undergo intra-molecular self-redox at a moderate temperature of about 270 ℃, forming metallic platinum and gaseous products. it is concluded that these two complexes should be alternative precursors for supported paltinum catalysts.Dimethygold iodide, a key intermediates for organometallic compounds of gold, was prepared via the reaction of methylmagnesium iodide and potassium tetrachloroaurate(Ⅲ) in a mixture of ether and hexane. Its chemical structure was characterized by using elemental analysis, MS, IR, 1H-NMR along with single X-ray diffraction. The results reveal that dimethygold iodide is a idide-bridged dimeric compound in which each gold atom is coordinated by two methyl groups and two idode ions, forming a planner complex unit. Two complex units are bridged together by two iodides and share the same plane.