6 research outputs found
Neutral Luminescent Bis(bipyridyl) Osmium(II) Complexes with Improved Phosphorescent Properties
No full textA new
class of neutral bisĀ(isocyanoĀborato) bisĀ(bipyridyl)
OsĀ(II) complexes with the general formula of [OsĀ(NāN)<sub>2</sub>Ā(CNBR<sub>3</sub>)<sub>2</sub>] (NāN = bpy, 4,4ā²-Me<sub>2</sub>bpy; R = C<sub>6</sub>F<sub>5</sub>, C<sub>6</sub>H<sub>5</sub>) were prepared with simple synthetic methodologies. One of these
complexes was structurally characterized by X-ray crystallography.
Unlike most of the neutral bisĀ(bipyridyl) OsĀ(II) complexes, which
are very weakly emissive or nonemissive, these isocyanoborato complexes
displayed intense orange to red phosphorescence with a luminescent
quantum yield up to 0.09 in CH<sub>2</sub>Cl<sub>2</sub> solution
at room temperature. The photophysical and electrochemical properties
of these complexes were also investigated. Detailed photophysical
study showed that these complexes exhibited significantly enhanced
emission properties over other reported neutral bisĀ(bipyridyl) OsĀ(II)
complexes. In addition, it also revealed that the photophysics, electrochemistry,
and excited state properties can be fine-tuned or modified through
the functionalization of isocyanoborate ligands
Luminescent Rhenium(I) Pyridyldiaminocarbene Complexes: Photophysics, Anion-Binding, and CO<sub>2</sub>āCapturing Properties
No full textA series of luminescent
isocyanorheniumĀ(I) complexes with chelating acyclic diaminocarbene
ligands (N^C) has been synthesized and characterized. Two of these
carbene complexes have also been structurally characterized by X-ray
crystallography. These complexes show blue-to-red phosphorescence,
with the emission maxima not only considerably varied with a change
in the number of ancillary isocyanide ligands but also extremely sensitive
to the electronic and steric nature of the substituents on the acyclic
diaminocarbene ligand. A detailed study with the support of density
functional theory calculations revealed that the lowest-energy absorption
and phosphorescence of these complexes in a degassed CH<sub>2</sub>Cl<sub>2</sub> solution are derived from the predominantly metal-to-ligand
charge-transfer [dĻĀ(Re) ā Ļ*Ā(N^C)] excited state.
The unprecedented anion-binding and CO<sub>2</sub>-capturing properties
of the acyclic diaminocarbene have also been described
Luminescent Rhenium(I) Pyridyldiaminocarbene Complexes: Photophysics, Anion-Binding, and CO<sub>2</sub>āCapturing Properties
No full textA series of luminescent
isocyanorheniumĀ(I) complexes with chelating acyclic diaminocarbene
ligands (N^C) has been synthesized and characterized. Two of these
carbene complexes have also been structurally characterized by X-ray
crystallography. These complexes show blue-to-red phosphorescence,
with the emission maxima not only considerably varied with a change
in the number of ancillary isocyanide ligands but also extremely sensitive
to the electronic and steric nature of the substituents on the acyclic
diaminocarbene ligand. A detailed study with the support of density
functional theory calculations revealed that the lowest-energy absorption
and phosphorescence of these complexes in a degassed CH<sub>2</sub>Cl<sub>2</sub> solution are derived from the predominantly metal-to-ligand
charge-transfer [dĻĀ(Re) ā Ļ*Ā(N^C)] excited state.
The unprecedented anion-binding and CO<sub>2</sub>-capturing properties
of the acyclic diaminocarbene have also been described
A Simple Design for Strongly Emissive Sky-Blue Phosphorescent Neutral Rhenium Complexes: Synthesis, Photophysics, and Electroluminescent Devices
No full textA simple design strategy for a new
class of stable, vacuum-sublimable,
and strongly emissive sky-blue neutral phosphorescent ReĀ(I) phenanthroline
complexes {ReĀ(R<sub>2</sub>phen)Ā(CO)<sub>3</sub>[CNBĀ(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>]} is reported. These complexes show intense
bluish green emission in CH<sub>2</sub>Cl<sub>2</sub> solution with
the highest emission quantum yield and bluest emission ever reported
for the neutral ReĀ(I) diimine complexes. In the solid state, they
display sky-blue emission. The electroluminescent properties of devices
containing these complexes have also been investigated
A Simple Design for Strongly Emissive Sky-Blue Phosphorescent Neutral Rhenium Complexes: Synthesis, Photophysics, and Electroluminescent Devices
No full textA simple design strategy for a new
class of stable, vacuum-sublimable,
and strongly emissive sky-blue neutral phosphorescent ReĀ(I) phenanthroline
complexes {ReĀ(R<sub>2</sub>phen)Ā(CO)<sub>3</sub>[CNBĀ(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>]} is reported. These complexes show intense
bluish green emission in CH<sub>2</sub>Cl<sub>2</sub> solution with
the highest emission quantum yield and bluest emission ever reported
for the neutral ReĀ(I) diimine complexes. In the solid state, they
display sky-blue emission. The electroluminescent properties of devices
containing these complexes have also been investigated
A Simple Design for Strongly Emissive Sky-Blue Phosphorescent Neutral Rhenium Complexes: Synthesis, Photophysics, and Electroluminescent Devices
No full textA simple design strategy for a new
class of stable, vacuum-sublimable,
and strongly emissive sky-blue neutral phosphorescent ReĀ(I) phenanthroline
complexes {ReĀ(R<sub>2</sub>phen)Ā(CO)<sub>3</sub>[CNBĀ(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>]} is reported. These complexes show intense
bluish green emission in CH<sub>2</sub>Cl<sub>2</sub> solution with
the highest emission quantum yield and bluest emission ever reported
for the neutral ReĀ(I) diimine complexes. In the solid state, they
display sky-blue emission. The electroluminescent properties of devices
containing these complexes have also been investigated
