Metal-to-ligand charge-transfer (MLCT) photochemistry: experimental evidence for the participation of a higher lying MLCT state in polypyridyl complexes of ruthenium(II) and osmium(II)

1990 ◽  
Vol 94 (1) ◽  
pp. 239-243 ◽  
Author(s):  
Richard S. Lumpkin ◽  
Edward M. Kober ◽  
Laura A. Worl ◽  
Zakir. Murtaza ◽  
Thomas J. Meyer
Keyword(s):  
Charge Transfer ◽  
Experimental Evidence ◽  
Polypyridyl Complexes ◽  
Ligand Charge Transfer ◽  
Mlct State

scholarly journals Controlling the Lifetime of the Triplet MLCT State in Fe(II) Polypyridyl Complexes through Ligand Modification

Inorganics ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 16 ◽  
Author(s):  
Jianfang Wu ◽  
Marc Alías ◽  
Coen de Graaf
Keyword(s):  
Charge Transfer ◽  
Field Strength ◽  
Computational Study ◽  
Relative Energy ◽  
Ligand Field ◽  
Polypyridyl Complexes ◽  
Ligand Modification ◽  
Ligand Charge Transfer ◽  
Mlct State

A computational study is presented in which two strategies of ligand modifications have been explored to invert the relative energy of the metal-to-ligand charge transfer (MLCT) and metal-centered (MC) state in Fe(II)-polypyridyl complexes. Replacing the bipyridines by stronger σ donors increases the ligand-field strength and pushes the MC state to higher energy, while the use of ligands with a larger π conjugation leads to lower MLCT energies.

Isolation of a metal-to-ligand charge-transfer (MLCT) state of a tris 1,4-diimine complex of iron in the solid state: X-ray crystal structure and EPR

2017 ◽  
Vol 41 (2) ◽  
pp. 452-456 ◽  
Author(s):  
Nirmal K. Shee ◽  
Michael G. B. Drew ◽  
Dipankar Datta
Keyword(s):  
Crystal Structure ◽  
Charge Transfer ◽  
Solid State ◽  
X Ray ◽  
Ligand Charge Transfer ◽  
Mlct State

Using 5,6-dihydro-5,6-epoxy-1,10-phenanthroline as the ligand L, the X-ray crystal structure of [FeL3](ClO4)2·2H2O is determined.

Luminescence of a New Ru(II) Polypyridine Complex Controlled by a Redox-Responsive Protonable Anthra[1,10]phenanthrolinequinone

2005 ◽  
Vol 70 (11) ◽  
pp. 1891-1908 ◽  
Author(s):  
František Hartl ◽  
Sandrine Vernier ◽  
Peter Belser
Keyword(s):  
Charge Transfer ◽  
Quantum Yield ◽  
Emission Intensity ◽  
Luminescence Quenching ◽  
Luminescence Quantum Yield ◽  
Ligand Charge Transfer ◽  
Redox Responsive ◽  
Electron Reduction ◽  
Mlct State

Redox-controlled luminescence quenching is presented for a new Ru(II)-bipyridine complex [Ru(bpy)2(1)]2+ where ligand 1 is an anthra[1,10]phenanthrolinequinone. The complex emits from a short-lived metal-to-ligand charge transfer, 3MLCT state (τ = 5.5 ns in deaerated acetonitrile) with a low luminescence quantum yield (5 × 10-4). The emission intensity becomes significantly enhanced when the switchable anthraquinone unit is reduced to corresponding hydroquinone. On the contrary, chemical one-electron reduction of the anthraquinone moiety to semiquinone in aprotic tetrahydrofuran results in total quenching of the emission.

Tuning of the lowest excited states in mixed ruthenium(ii) polypyridyl complexes having RuN6 cores by the conformation of the ancillary ligand. Emission from a 3ligand-to-ligand-charge-transfer state

2016 ◽  
Vol 40 (6) ◽  
pp. 5002-5009 ◽  
Author(s):  
Nirmal K. Shee ◽  
Michael G. B. Drew ◽  
Dipankar Datta
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Excited States ◽  
Small Difference ◽  
Charge Transfer State ◽  
Ancillary Ligand ◽  
Polypyridyl Complexes ◽  
Ligand Charge Transfer ◽  
Transfer State

A small difference in the conformation of an ancillary ligand L determines the lowest excited state in [Ru(bpy)2L]2+ and [Ru(phen)2L]2+.

Observations on the Low-Energy Limits for Metal-to-Ligand Charge-Transfer Excited-State Energies of Ruthenium(II) Polypyridyl Complexes

2010 ◽  
Vol 49 (20) ◽  
pp. 9095-9097 ◽  
Author(s):  
Onduru S. Odongo ◽  
Marco M. Allard ◽  
H. Bernhard Schlegel ◽  
John F. Endicott
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Low Energy ◽  
Polypyridyl Complexes ◽  
Ligand Charge Transfer

Synthesis and Photochemical Properties of Re(I) Tricarbonyl Complexes Bound to Thione and Thiazole-2-ylidene Ligands

2020 ◽  
Author(s):  
Matthew Stout ◽  
Brian Skelton ◽  
Alexandre N. Sobolev ◽  
Paolo Raiteri ◽  
Massimiliano Massi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Bidentate Ligand ◽  
The Other ◽  
Ligand Exchange Reaction ◽  
Multiple Products ◽  
Ligand Charge Transfer ◽  
Photochemical Properties

<p>Three Re(I) tricarbonyl complexes, with general formulation Re(N^L)(CO)<sub>3</sub>X (where N^L is a bidentate ligand containing a pyridine functionalized in the position 2 with a thione or a thiazol-2-ylidene group and X is either chloro or bromo) were synthesized and their reactivity explored in terms of solvent-dependent ligand substitution, both in the ground and excited states. When dissolved in acetonitrile, the complexes bound to the thione ligand underwent ligand exchange with the solvent resulting in the formation of Re(NCMe)<sub>2</sub>(CO)<sub>3</sub>X. The exchange was found to be reversible, and the starting complex was reformed upon removal of the solvent. On the other hand, the complexes appeared inert in dichloromethane or acetone. Conversely, the complex bound to the thiazole-2-ylidene ligand did not display any ligand exchange reaction in the dark, but underwent photoactivated ligand substitution when excited to its lowest metal-to-ligand charge transfer manifold. Photolysis of this complex in acetonitrile generated multiple products, including Re(I) tricarbonyl and dicarbonyl solvato-complexes as well as free thiazole-2-ylidene ligand.</p>

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