8 research outputs found
Luminescent Metallogels of Bis-Cyclometalated Alkynylgold(III) Complexes
A series of luminescent bis-cyclometalated alkynylgoldÂ(III)
complexes
have been synthesized and characterized. Some of the complexes have
been demonstrated to exhibit gelation properties driven by π–π
stacking and hydrophobic–hydrophobic interactions. The gelation
properties have been investigated in detail through variable-temperature
UV–vis absorption and emission studies, and the morphology
of the gels has also been characterized by scanning electron microscopy
and transmission electron microscopy
Luminescent Metallogels of Bis-Cyclometalated Alkynylgold(III) Complexes
A series of luminescent bis-cyclometalated alkynylgoldÂ(III)
complexes
have been synthesized and characterized. Some of the complexes have
been demonstrated to exhibit gelation properties driven by π–π
stacking and hydrophobic–hydrophobic interactions. The gelation
properties have been investigated in detail through variable-temperature
UV–vis absorption and emission studies, and the morphology
of the gels has also been characterized by scanning electron microscopy
and transmission electron microscopy
Luminescent Metallogels of Bis-Cyclometalated Alkynylgold(III) Complexes
A series of luminescent bis-cyclometalated alkynylgoldÂ(III)
complexes
have been synthesized and characterized. Some of the complexes have
been demonstrated to exhibit gelation properties driven by π–π
stacking and hydrophobic–hydrophobic interactions. The gelation
properties have been investigated in detail through variable-temperature
UV–vis absorption and emission studies, and the morphology
of the gels has also been characterized by scanning electron microscopy
and transmission electron microscopy
Synthesis, Characterization, and Luminescence Studies of Discrete Polynuclear Gold(I) Sulfido and Selenido Complexes with Intramolecular Aurophilic Contacts
The synthesis, characterization,
and photophysical and photochemical
properties of a family of high-nuclearity goldÂ(I) chalcogenides, specifically,
the goldÂ(I) sulfido and selenido complexes containing different bridging
diphosphine ligands with nuclearities of ten ([Au<sub>10</sub>{μ-Ph<sub>2</sub>PNÂ(R)ÂPPh<sub>2</sub>}<sub>4</sub>(μ<sub>3</sub>-E)<sub>4</sub>]<sup>2+</sup>) and six ([Au<sub>6</sub>{μ-Ph<sub>2</sub>PNÂ(R)ÂPPh<sub>2</sub>}<sub>3</sub>Â(μ<sub>3</sub>-E)<sub>2</sub>]<sup>2+</sup>), are reported. The X-ray crystal
structures of the complex cations of Au<sub>10</sub> and Au<sub>6</sub> are found to be propeller-like structures and distorted cubane structures,
respectively, with the presence of short intramolecular gold<sup>...</sup>gold distances. The complexes show intense green and/or orange phosphorescence
upon photoexcitation in the solid state and in solution at ambient
and low temperature. The emission properties are found to be strongly
dependent on the nuclearities and the chalcogenido ligands, but are
rather insensitive to the substituents on the bisÂ(diphenylphosphino)Âamines.
The emissions are tentatively assigned to originate from the excited
states derived from the phosphine-centered intraligand (IL) transition
or metal-centered (ds/dp) mixed with ligand-to-metal–metal
charge transfer (LMMCT) (E→Au) transition. The photochemical
properties of the complexes were also studied by transient absorption
spectroscopy
Synthesis, Characterization, and Luminescence Studies of Discrete Polynuclear Gold(I) Sulfido and Selenido Complexes with Intramolecular Aurophilic Contacts
The synthesis, characterization,
and photophysical and photochemical
properties of a family of high-nuclearity goldÂ(I) chalcogenides, specifically,
the goldÂ(I) sulfido and selenido complexes containing different bridging
diphosphine ligands with nuclearities of ten ([Au<sub>10</sub>{μ-Ph<sub>2</sub>PNÂ(R)ÂPPh<sub>2</sub>}<sub>4</sub>(μ<sub>3</sub>-E)<sub>4</sub>]<sup>2+</sup>) and six ([Au<sub>6</sub>{μ-Ph<sub>2</sub>PNÂ(R)ÂPPh<sub>2</sub>}<sub>3</sub>Â(μ<sub>3</sub>-E)<sub>2</sub>]<sup>2+</sup>), are reported. The X-ray crystal
structures of the complex cations of Au<sub>10</sub> and Au<sub>6</sub> are found to be propeller-like structures and distorted cubane structures,
respectively, with the presence of short intramolecular gold<sup>...</sup>gold distances. The complexes show intense green and/or orange phosphorescence
upon photoexcitation in the solid state and in solution at ambient
and low temperature. The emission properties are found to be strongly
dependent on the nuclearities and the chalcogenido ligands, but are
rather insensitive to the substituents on the bisÂ(diphenylphosphino)Âamines.
The emissions are tentatively assigned to originate from the excited
states derived from the phosphine-centered intraligand (IL) transition
or metal-centered (ds/dp) mixed with ligand-to-metal–metal
charge transfer (LMMCT) (E→Au) transition. The photochemical
properties of the complexes were also studied by transient absorption
spectroscopy
Functionalized Bis-Cyclometalated Alkynylgold(III) Complexes: Synthesis, Characterization, Electrochemistry, Photophysics, Photochemistry, and Electroluminescence Studies
A series of luminescent
alkynylgoldÂ(III) complexes containing various
tridentate bis-cyclometalating ligands derived from 2,6-diphenylpyridine
(R-C<sup>∧</sup>N<sup>∧</sup>C), [AuÂ(R-C<sup>∧</sup>N<sup>∧</sup>C)Â(Cî—¼Cî—¸C<sub>6</sub>H<sub>4</sub>î—¸R′)] has been successfully synthesized and characterized.
Complexes <b>1</b> and <b>6</b> have been determined by
X-ray crystallography. Electrochemical studies show a ligand-centered
reduction that originated from the tridentate R-C<sup>∧</sup>N<sup>∧</sup>C pincer ligands and an alkynyl-centered oxidation.
The photophysical properties of the complexes have been studied in
detail by electronic absorption and emission studies. Tunable photoluminescence
behaviors have been observed, with the emission maxima spanning through
the visible region from 476 to 669 nm in dichloromethane at room temperature,
and the complexes were also found to be emissive in various media
at both room and low temperatures. Transient absorption studies have
been conducted to investigate the excited state properties of the
complexes. Furthermore, selected complexes have been incorporated
into the emissive layer (EML) of organic light-emitting devices (OLEDs)
and have demonstrated interesting electroluminescence
Functionalized Bis-Cyclometalated Alkynylgold(III) Complexes: Synthesis, Characterization, Electrochemistry, Photophysics, Photochemistry, and Electroluminescence Studies
A series of luminescent
alkynylgoldÂ(III) complexes containing various
tridentate bis-cyclometalating ligands derived from 2,6-diphenylpyridine
(R-C<sup>∧</sup>N<sup>∧</sup>C), [AuÂ(R-C<sup>∧</sup>N<sup>∧</sup>C)Â(Cî—¼Cî—¸C<sub>6</sub>H<sub>4</sub>î—¸R′)] has been successfully synthesized and characterized.
Complexes <b>1</b> and <b>6</b> have been determined by
X-ray crystallography. Electrochemical studies show a ligand-centered
reduction that originated from the tridentate R-C<sup>∧</sup>N<sup>∧</sup>C pincer ligands and an alkynyl-centered oxidation.
The photophysical properties of the complexes have been studied in
detail by electronic absorption and emission studies. Tunable photoluminescence
behaviors have been observed, with the emission maxima spanning through
the visible region from 476 to 669 nm in dichloromethane at room temperature,
and the complexes were also found to be emissive in various media
at both room and low temperatures. Transient absorption studies have
been conducted to investigate the excited state properties of the
complexes. Furthermore, selected complexes have been incorporated
into the emissive layer (EML) of organic light-emitting devices (OLEDs)
and have demonstrated interesting electroluminescence
Luminescence Color Tuning by Regulating Electrostatic Interaction in Light-Emitting Devices and Two-Photon Excited Information Decryption
It is well-known
that the variation of noncovalent interactions of luminophores, such
as π–π interaction, metal-to-metal interaction,
and hydrogen-bonding interaction, can regulate their emission colors.
Electrostatic interaction is also an important noncovalent interaction.
However, very few examples of luminescence color tuning induced by
electrostatic interaction were reported. Herein, a series of ZnÂ(II)-bisÂ(terpyridine)
complexes (<b>Zn-AcO</b>, <b>Zn-BF</b><sub><b>4</b></sub>, <b>Zn-ClO</b><sub><b>4</b></sub>, and <b>Zn-PF</b><sub><b>6</b></sub>) containing different anionic counterions
were reported, which exhibit counterion-dependent emission colors
from green-yellow to orange-red (549 to 622 nm) in CH<sub>2</sub>Cl<sub>2</sub> solution. More importantly, it was found that the excited
states of these ZnÂ(II) complexes can be regulated by changing the
electrostatic interaction between Zn<sup>2+</sup> and counterions.
On the basis of this controllable excited state, white light emission
has been achieved by a single molecule, and a white light-emitting
device has been fabricated. Moreover, a novel type of data decryption
system with <b>Zn-PF</b><sub><b>6</b></sub> as the optical
recording medium has been developed by the two-photon excitation technique.
Our results suggest that rationally controlled excited states of these
ZnÂ(II) complexes by regulating electrostatic interaction have promising
applications in various optoelectronic fields, such as light-emitting
devices, information recording, security protection, and so on