Ligand-to-metal charge-transfer state

The most widely studied and most exploited of inorganic ECL reactions, however, is that of tris(2,2 -bipyridine) ruthenium(II), [(bpy)3Ru]2+. The emissive excited state is a metal-to-ligand charge transfer state of triplet spin multiplicity the emission yield is approximately 10% and oxygen does not significantly quench the luminescence [22], The complex can exhibit ECL following sequential oxidation at the metal center and reduction of the coordinated 2,2 -... 

Metal-to-ligand-charge-transfer States in -diimine complexes... 

The applicability of LFDFT, like LFT itself, is rooted in an effective hamiltonian theory that states that, in principle, it is possible to define precisely a hamiltonian for a sub-system such as the levels of a transition metal in a transition-metal complex or a solid. This condition is possible, because in Wemer-type complexes the metal-ligand bond is mostly ionic and as such allows one to take a spectroscopically justified preponderant electronic d" or f" configuration as well defined ligand-to-metal and metal-to-ligand charge-transfer states are well separated from excitations within this configuration. 

The variety of studies conducted with tris(phenanthroline)metal complexes and DNA perhaps most easily illustrate this point (16). Tris(phenanthroline) complexes of ruthenium(II) and its derivatives possess an intense luminescent metal-to-ligand charge-transfer state that is... 

FIG. 4 Latimer diagram for Ru(bpy)3. The excited state corresponds to a triplet metal-to-ligand charge transfer state. 

The first application of TRIR to the excited state of a transition-metal coordination compound was the detection of the MLCT (metal-to-ligand charge transfer) state of Re(CO)3Cl(4,4 -bpy)2... 

Alberding BG, Chisholm MH, Gallucci JC et al (2011) Electron delocalization in the S-1 and T-1 metal-to-ligand charge transfer states of transsubstituted metal quadruply bonded complexes. Proc Natl Acad Sci USA 108 8152-8156... 

Villaume S, Daniel C (2005) Emission spectroscopy of metal-to-ligand-charge-transfer states of HRe(CO)3(H-DAB), model system for alpha-diimine rhenium tricarbonyl complexes. Comptes Rendus Chimie 8 1453-1460... 

MLCT metal to ligand charge transfer state... 

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