The Experts below are selected from a list of 1575 Experts worldwide ranked by ideXlab platform
Yan Wan - One of the best experts on this subject based on the ideXlab platform.
-
solvation controlled excited state planarization in a push pull Pyrene dye
Journal of Physical Chemistry C, 2020Co-Authors: Yuanyuan Guo, Chathura S Abeywickrama, Dayujia Huo, Jie Kong, Min Tao, Andong Xia, Yi Pang, Yan WanAbstract:The excited-state deactivation pathway of the push–pull Pyrene Derivative (EPP), a molecule emitting bright red fluorescence, has been studied in several solvents using quantum chemical calculation...
-
solvation controlled excited state planarization in a push pull Pyrene dye
The Journal of Physical Chemistry, 2020Co-Authors: Yuanyuan Guo, Chathura S Abeywickrama, Dayujia Huo, Jie Kong, Min Tao, Andong Xia, Yi Pang, Yan WanAbstract:The excited-state deactivation pathway of the push–pull Pyrene Derivative (EPP), a molecule emitting bright red fluorescence, has been studied in several solvents using quantum chemical calculations, femtosecond time-resolved fluorescence up-conversion spectroscopy, and femtosecond transient absorption spectra (fs-TA). From the steady-state spectra, EPP has shown a strong negatively solvatochromic behavior of the absorption spectra and non-solvatochromic emission spectra, revealing the decreased dipole moment upon excitation. Femtosecond up-conversion measurements have shown interesting rise–decay kinetics at the red emission side and fs-TA spectra also feature the SE (stimulated emission) formed and new ESA (excited-state absorption) developed in all investigated solvents. The careful analysis of the data gathered from fluorescence up-conversion and fs-TA spectra, supported by DFT quantum chemical calculations and temperature-dependent fluorescence measurements, unambiguously pointed out the excited-state relaxation pathway of EPP is controlled by solvent stabilized planar intramolecular charge transfer (PICT) dynamics. This finding confirms the surrounding solvents as a significant factor that affects the rate of excited-state conformation changes.
Takehiko Yamato - One of the best experts on this subject based on the ideXlab platform.
-
synthesis and fluorescence emission properties of 1 3 6 8 tetrakis 9h fluoren 2 yl Pyrene Derivative
ChemInform, 2010Co-Authors: Hidetaka Hiyoshi, Takehiko YamatoAbstract:The blue fluorescenting title Pyrene Derivative (IV), synthesized via a Pd-catalyzed Suzuki coupling reaction of corresponding tetrabromoPyrene (II) with dioxoborolane (III), possesses potential application as blue-emitting material in organic light-emitting diodes.
-
synthesis and fluorescence emission properties of 1 3 6 8 tetrakis 9h fluoren 2 yl Pyrene Derivative
Journal of Chemical Research-s, 2010Co-Authors: Hidetaka Hiyoshi, Takehiko YamatoAbstract:A novel Pyrene-based highly pure blue fluorescent and stable molecule, 1,3,6,8-tetrakis[9,9-bis(3-methylbutyl)-9H fluoren-2-yl]Pyrene, was successfully synthesised via a Pd-catalysed Suzuki coupling reaction of 1,3,6,8-tetrabromo-Pyrene with 2-[9,9-bis(3-methylbutyl)-9H-fluoren-2-yl]-4,4,5,5-tetramethyl[1,3,2]dioxaborolane. The photoproperties of this Pyrene were examined in detail and these data indicated its potential application as blue-emitting materials in organic light-emitting diodes.
-
synthesis and fluorescence emission properties of 1 3 6 8 tetrakis 9h fluoren 2 yl Pyrene Derivative
Journal of Chemical Research-s, 2010Co-Authors: Hidetaka Hiyoshi, Takehiko YamatoAbstract:A novel Pyrene-based highly pure blue fluorescent and stable molecule, 1,3,6,8-tetrakis[9,9-bis(3-methylbutyl)-9H-fluoren-2-yl]Pyrene, was successfully synthesised via a Pd-catalysed Suzuki couplin...
Yi Pang - One of the best experts on this subject based on the ideXlab platform.
-
solvation controlled excited state planarization in a push pull Pyrene dye
Journal of Physical Chemistry C, 2020Co-Authors: Yuanyuan Guo, Chathura S Abeywickrama, Dayujia Huo, Jie Kong, Min Tao, Andong Xia, Yi Pang, Yan WanAbstract:The excited-state deactivation pathway of the push–pull Pyrene Derivative (EPP), a molecule emitting bright red fluorescence, has been studied in several solvents using quantum chemical calculation...
-
solvation controlled excited state planarization in a push pull Pyrene dye
The Journal of Physical Chemistry, 2020Co-Authors: Yuanyuan Guo, Chathura S Abeywickrama, Dayujia Huo, Jie Kong, Min Tao, Andong Xia, Yi Pang, Yan WanAbstract:The excited-state deactivation pathway of the push–pull Pyrene Derivative (EPP), a molecule emitting bright red fluorescence, has been studied in several solvents using quantum chemical calculations, femtosecond time-resolved fluorescence up-conversion spectroscopy, and femtosecond transient absorption spectra (fs-TA). From the steady-state spectra, EPP has shown a strong negatively solvatochromic behavior of the absorption spectra and non-solvatochromic emission spectra, revealing the decreased dipole moment upon excitation. Femtosecond up-conversion measurements have shown interesting rise–decay kinetics at the red emission side and fs-TA spectra also feature the SE (stimulated emission) formed and new ESA (excited-state absorption) developed in all investigated solvents. The careful analysis of the data gathered from fluorescence up-conversion and fs-TA spectra, supported by DFT quantum chemical calculations and temperature-dependent fluorescence measurements, unambiguously pointed out the excited-state relaxation pathway of EPP is controlled by solvent stabilized planar intramolecular charge transfer (PICT) dynamics. This finding confirms the surrounding solvents as a significant factor that affects the rate of excited-state conformation changes.
-
bright red emitting Pyrene Derivatives with a large stokes shift for nucleus staining
Chemical Communications, 2017Co-Authors: Chathura S Abeywickrama, Kaveesha J Wijesinghe, Robert V Stahelin, Yi PangAbstract:A highly fluorescent red-emitting Pyrene Derivative was synthesized and found to exhibit a large Stokes shift (λem ≈ 610 nm, Δλ ∼ 130 nm, Δν ∼ 4597 cm-1). The probe molecule showed remarkable selectivity to stain the nucleus in both live and fixed cells, with higher sensitivity than commercial dye DRAQ5.
Chathura S Abeywickrama - One of the best experts on this subject based on the ideXlab platform.
-
solvation controlled excited state planarization in a push pull Pyrene dye
Journal of Physical Chemistry C, 2020Co-Authors: Yuanyuan Guo, Chathura S Abeywickrama, Dayujia Huo, Jie Kong, Min Tao, Andong Xia, Yi Pang, Yan WanAbstract:The excited-state deactivation pathway of the push–pull Pyrene Derivative (EPP), a molecule emitting bright red fluorescence, has been studied in several solvents using quantum chemical calculation...
-
solvation controlled excited state planarization in a push pull Pyrene dye
The Journal of Physical Chemistry, 2020Co-Authors: Yuanyuan Guo, Chathura S Abeywickrama, Dayujia Huo, Jie Kong, Min Tao, Andong Xia, Yi Pang, Yan WanAbstract:The excited-state deactivation pathway of the push–pull Pyrene Derivative (EPP), a molecule emitting bright red fluorescence, has been studied in several solvents using quantum chemical calculations, femtosecond time-resolved fluorescence up-conversion spectroscopy, and femtosecond transient absorption spectra (fs-TA). From the steady-state spectra, EPP has shown a strong negatively solvatochromic behavior of the absorption spectra and non-solvatochromic emission spectra, revealing the decreased dipole moment upon excitation. Femtosecond up-conversion measurements have shown interesting rise–decay kinetics at the red emission side and fs-TA spectra also feature the SE (stimulated emission) formed and new ESA (excited-state absorption) developed in all investigated solvents. The careful analysis of the data gathered from fluorescence up-conversion and fs-TA spectra, supported by DFT quantum chemical calculations and temperature-dependent fluorescence measurements, unambiguously pointed out the excited-state relaxation pathway of EPP is controlled by solvent stabilized planar intramolecular charge transfer (PICT) dynamics. This finding confirms the surrounding solvents as a significant factor that affects the rate of excited-state conformation changes.
-
bright red emitting Pyrene Derivatives with a large stokes shift for nucleus staining
Chemical Communications, 2017Co-Authors: Chathura S Abeywickrama, Kaveesha J Wijesinghe, Robert V Stahelin, Yi PangAbstract:A highly fluorescent red-emitting Pyrene Derivative was synthesized and found to exhibit a large Stokes shift (λem ≈ 610 nm, Δλ ∼ 130 nm, Δν ∼ 4597 cm-1). The probe molecule showed remarkable selectivity to stain the nucleus in both live and fixed cells, with higher sensitivity than commercial dye DRAQ5.
Jang Wook Choi - One of the best experts on this subject based on the ideXlab platform.
-
a Pyrene poly acrylic acid polyrotaxane supramolecular binder network for high performance silicon negative electrodes
Advanced Materials, 2019Co-Authors: Yunshik Cho, Jaemin Kim, Ahmed Elabd, Sunghun Choi, Ki Ho Park, Taewoo Kwon, J H Lee, Kookheon Char, Ali Coskun, Jang Wook ChoiAbstract:Although being incorporated in commercial lithium-ion batteries for a while, the weight portion of silicon monoxide (SiOx , x ≈ 1) is only less than 10 wt% due to the insufficient cycle life. Along this line, polymeric binders that can assist in maintaining the mechanical integrity and interfacial stability of SiOx electrodes are desired to realize higher contents of SiOx . Herein, a Pyrene-poly(acrylic acid) (PAA)-polyrotaxane (PR) supramolecular network is reported as a polymeric binder for SiOx with 100 wt%. The noncovalent functionalization of a carbon coating layer on the SiOx is achieved by using a hydroxylated Pyrene Derivative via the π-π stacking interaction, which simultaneously enables hydrogen bonding interactions with the PR-PAA network through its hydroxyl moiety. Moreover, the PR's ring sliding while being crosslinked to PAA endows a high elasticity to the entire polymer network, effectively buffering the volume expansion of SiOx and largely mitigating the electrode swelling. Based on these extraordinary physicochemical properties of the Pyrene-PAA-PR supramolecular binder, the robust cycling of SiOx electrodes is demonstrated at commercial levels of areal loading in both half-cell and full-cell configurations.
