Synthesis,Characterization And Applications Of Ruthenium(â…¡) And Iridium(â…¢) Complexes

d6 transitional metal complexes which are characteristic with metal-to-ligand charge-transfer transition (MLCT) and intraligand(Ï€-Ï€) transition exhibit unique photophysical and photochemical properties. They have become a potential luminescent material to be widely applied in many scientific research and actual production. Among them, iridium(III) and ruthenium(II) complexes exhibit advantageous photophysical properties such as high quantum efficiency, large stock shift, long luminescence lifetime and so on. They are widely applied in many fields such as biosensing technology, clinical medicine, solar energy transformation, supermolecule assembly, photocatalysis, nonlinear optics materials and others. Besides, the ligands of the complexes could be changed and modified to optimize its luminescent properties, and functional groups could recognize some ions, amino acid, DNA or something else, which could be applied in biological detection and clinical medical fields.In this work, a serious of Ru(II) and Ir(III) complexes are designed and synthesized. The applications in the optical chemical sensing by modification of special group or the special structural properties of complex are investigated. The main contents are as follows:In the first chapter, the basic luminescence theory of the d6 transition metal complexes such as the luminous principle, crystal field and charge transition theory. The applications of the Ru(II) and Ir(III) complexes in chemical sensing such as ions, amino acids and pH sensing are introduced. Finally, the common methods for the detection of cyanide such as titration, volt-ampere, chromatography, colorimetric and luminescent method have been introduced.In chapter 2, a serious of novel Ru(II) complexes with different aldehyde and electronics group have been synthesized and characterized. The physical and chemical sensing for cyanide was explored.The sensitivity and selectivity, the luminescence propties influenced by the different amount of water and aldehyde group have been investigated.1HNMR and mass spectrometry method have been used to explore its reaction mechanism.In chapter 3, two neutral iridium(III) complexes with two aldehyde groups by the reaction of the iridium(III) chloride with 8 - hydroxy- 5-quinolone in certain conditions have been synthesized and characterized by infrared,1HNMR and mass spectrum. Its basic physical and chemical properties and the sensing of homocysteine, cysteine and cyanide have also been investigated.In chapter 4, two Ir(III) chlorine bridge complexes are synthesized to sense the tetraethy lammounium cyanide, and its reaction sensitivity and selectivity are studied. The luminescence properties in water medium have been also explored. Finally, the mass spectrometry method is attempted to explore its reaction mechanism.