Synthesis, Characterization, and Photochemical and Computational Investigations of Ru(II) Heterocyclic Complexes Containing 2,6-dimethylphenylisocyanide (CNx) Ligand
Copyright policy )Synthesis, Characterization, and Photochemical and Computational Investigations of Ru(II) Heterocyclic Complexes Containing 2,6-dimethylphenylisocyanide (CNx) Ligand
The isocyanide ligand forms complexes with ruthenium(II) bis-bipyridine of the type [Ru(bpy)(2)(CNx)Cl](CF(3)SO(3)) (1), [Ru(bpy)(2)(CNx)(py)](PF(6))(2) (2), and [Ru(bpy)(2)(CNx)(2)](PF(6))(2) (3) (bpy = 2,2'-bipyridine, py = pyridine, and CNx = 2,6-dimethylphenylisocyanide). The redox potentials shift positively as the number of CNx ligands increases. The metal-to-ligand charge-transfer (MLCT) bands of the complexes are located at higher energy than 450 nm and blue shift in proportion to the number of CNx ligands. The complexes are not emissive at room temperature but exhibit intense structured emission bands at 77 K with emission lifetimes as high as 25 micros. Geometry optimization of the complexes in the singlet ground and lowest-lying triplet states performed using density functional theory (DFT) provides information about the orbital heritage and correlates with X-ray and electrochemical results. The lowest-lying triplet-state energies correlate well with the 77 K emission energies for the three complexes. Singlet excited states calculated in ethanol using time-dependent density functional theory (TDDFT) and the conductor-like polarizable continuum model (CPCM) provide information that correlates favorably with the experimental absorption spectra in ethanol.
- The University of Texas System United States
- Wichita State University United States
Models, Molecular, Photochemistry, Isocyanates/chemistry, Molecular Conformation, Research Support, Crystallography, X-Ray, Ligands, Ruthenium, Cyanides/chemistry, Organophosphorus Compounds, Models, Heterocyclic Compounds, Organometallic Compounds, Computer Simulation, Non-U.S. Gov't, Non-P.H.S, Crystallography, Cyanides, Heterocyclic Compounds/chemistry, Organometallic Compounds/chemistry, Molecular, Ruthenium/chemistry, 540, Organometallic Compounds/chemical synthesis, Organophosphorus Compounds/chemical synthesis, X-Ray, Heterocyclic Compounds/chemical synthesis, Organophosphorus Compounds/chemistry, U.S. Gov't, Isocyanates
Models, Molecular, Photochemistry, Isocyanates/chemistry, Molecular Conformation, Research Support, Crystallography, X-Ray, Ligands, Ruthenium, Cyanides/chemistry, Organophosphorus Compounds, Models, Heterocyclic Compounds, Organometallic Compounds, Computer Simulation, Non-U.S. Gov't, Non-P.H.S, Crystallography, Cyanides, Heterocyclic Compounds/chemistry, Organometallic Compounds/chemistry, Molecular, Ruthenium/chemistry, 540, Organometallic Compounds/chemical synthesis, Organophosphorus Compounds/chemical synthesis, X-Ray, Heterocyclic Compounds/chemical synthesis, Organophosphorus Compounds/chemistry, U.S. Gov't, Isocyanates
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