Time-resolved photoselection of [Ru(bpy)3]2+-exciton hopping in the excited state

Myrick, Michael L.; Blakley, R. L.; DeArmond, M. Keith

doi:10.1021/ja00243a056

Cited by 30 publications

(12 citation statements)

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“…Ground-state absorption around 450 nm will be due to MLCT transitions for both complexes. These transitions are directed from the Ruthenium to the center of one of the bipyridines . The nature of the weaker ground-state transitions at 360 nm is more uncertain.…”

Section: Discussionmentioning

confidence: 99%

“…These transitions are directed from the Ruthenium to the center of one of the bipyridines. 20 The nature of the weaker ground-state transitions at 360 nm is more uncertain. [Ru(bpy) 3 ] 2+ has some MLCT, some metal centered (MC), and some ligand centered (LC) character, whereas [Ru(bpy)(py) 4 ] 2+ transitions are mainly MLCT from the ruthenium to the pyridine ligands.…”

Section: Transient Absorption Anisotropymentioning

confidence: 99%

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Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)₃]²⁺ and [Ru(bpy)(py)₄]²⁺. Ultrafast Interligand Randomization of the MLCT State

et al. 2005

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It is known that the relaxed excited state of [Ru(bpy)3]2+ is best described as a metal to ligand charge transfer (MLCT) state having one formally reduced bipyridine and two neutral. Previous reports have suggested [Malone, R. et al. J. Chem. Phys. 1991, 95, 8970] that the electron "hops" from ligand to ligand in the MLCT state with a time constant of about 50 ps in acetonitrile. However, we have done transient absorption anisotropy measurements indicating that already after one picosecond the molecule has no memory of which bipyridine was initially photoselected, which suggests an ultrafast interligand randomization of the MLCT state.

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Section: Discussionmentioning

confidence: 99%

Section: Transient Absorption Anisotropymentioning

confidence: 99%

Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)₃]²⁺ and [Ru(bpy)(py)₄]²⁺. Ultrafast Interligand Randomization of the MLCT State

et al. 2005

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“…The detection of rotational motions using these complexes is not an obvious result. A large number of published reports have suggested that the anisotropy and anisotropy decay of the Ru metal-ligand complexes is caused by intermolecular processes such as randomization of the excited state among the three organic ligands and/or interactions with the solvent that result in localization of the excited state after randomization (Yersin and Braun, 1991;Myrick et al, 1987;Blakley et al, 1988;Ferguson et al, 1985). The range of measurable correlation times is determined by the lifetime of the excited state.…”

Section: Olmentioning

confidence: 99%

Metal-ligand complexes as a new class of long-lived fluorophores for protein hydrodynamics

Terpetschnig

Szmacinski

Malak

et al. 1995

Biophysical Journal

193

127

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We describe the use of asymmetric Ru-ligand complexes as a new class of luminescent probes that can be used to measure rotational motions of proteins. These complexes are known to display luminescent lifetimes ranging from 10 to 4000 ns. In this report, we show that the asymmetric complex Ru(bpy)2(dcbpy) (PF6)2 displays a high anisotropy value when excited in the long wavelength absorption band. For covalent linkage to proteins, we synthesized the N-hydroxy succinimide ester of this metal-ligand complex. To illustrate the usefulness of these probes, we describe the intensity and anisotropy decays of [Ru(bpy)2(dcbpy)] when covalently linked to human serum albumin, concanavalin A (ConA), human immunoglobulin G (IgG), and Ferritin, and measured in solutions of increased viscosity. These data demonstrate that the probes can be used to measure rotational motions on the 10 ns to 1.5 microseconds timescale, which so far has been inaccessible using luminescence methods. The present probe [Ru(bpy)2(dcbpy)] can be regarded as the first of a class of metal-ligand complexes, each with different chemical reactivity and spectral properties, for studies of macromolecular dynamics.

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“…However, both are known as adducts with various nucleophiles (B3H7-L, L = NH320 and CO;21 B4H8*L, L = PF2NMe222). In previous studies23'26 (12) Binkley, J. S.; Thorne, L. R. J. Chem. Phys.…”

Section: Discussionmentioning

confidence: 93%

Theoretical study of the interaction of ammonia with the boron hydrides BH3, B3H7, B4H8, and B5H9 and the carboranes C2B3H5 and C2B3H7

McKee¹

1988

Inorg. Chem.

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Time-resolved photoselection of [Ru(bpy)3]2+-exciton hopping in the excited state

Cited by 30 publications

References 1 publication

Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)₃]²⁺ and [Ru(bpy)(py)₄]²⁺. Ultrafast Interligand Randomization of the MLCT State

Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)₃]²⁺ and [Ru(bpy)(py)₄]²⁺. Ultrafast Interligand Randomization of the MLCT State

Metal-ligand complexes as a new class of long-lived fluorophores for protein hydrodynamics

Theoretical study of the interaction of ammonia with the boron hydrides BH3, B3H7, B4H8, and B5H9 and the carboranes C2B3H5 and C2B3H7

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Time-resolved photoselection of [Ru(bpy)3]2+-exciton hopping in the excited state

Cited by 30 publications

References 1 publication

Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)3]2+ and [Ru(bpy)(py)4]2+. Ultrafast Interligand Randomization of the MLCT State

Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)3]2+ and [Ru(bpy)(py)4]2+. Ultrafast Interligand Randomization of the MLCT State

Metal-ligand complexes as a new class of long-lived fluorophores for protein hydrodynamics

Theoretical study of the interaction of ammonia with the boron hydrides BH3, B3H7, B4H8, and B5H9 and the carboranes C2B3H5 and C2B3H7

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Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)₃]²⁺ and [Ru(bpy)(py)₄]²⁺. Ultrafast Interligand Randomization of the MLCT State

Femtosecond Transient Absorption Anisotropy Study on [Ru(bpy)₃]²⁺ and [Ru(bpy)(py)₄]²⁺. Ultrafast Interligand Randomization of the MLCT State