scholarly journals Janus Luminogens with Bended Intramolecular Charge Transfer: Towards Molecular Transistor and Brain Imaging

2021 ◽  
Author(s):  
Qian WU ◽  
Junkai Liu ◽  
Youmei Li ◽  
Michelle Mei Suet Lee ◽  
lianrui hu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Brain Imaging ◽  
Near Infrared ◽  
Intramolecular Charge Transfer ◽  
Infrared Emission ◽  
Related Development ◽  
Challenging Tasks ◽  
Donor Acceptor ◽  
Major Trend ◽  
Molecular Transistor

The ingenious construction of electron donor-acceptor (D-A) system has been proven to be the major trend for novel advanced-performance optoelectronic materials. However, the related development is undiversified and become stereotyped in recent years, and the explorationsof new architecture with both prominentoptoelectronic property and innovatively coined optoelectronic mechanism are appealing yet significantly challenging tasks. We herein exploit a series of novel Janus luminogens, namely TAOs, with unique charge separation in asimple five-membered mesoionic ring.TAOs having low molecular weight present efficient aggregation-induced red/near-infrared emission with up to 21.5% of fluorescence quantum yield. A new mechanism termed as bended intramolecular charge transfer (BICT) is proposed to understand the fluorescence behavior. It is experimentally demonstrated that TAOs exhibit great potential for the use as molecular transistor, and can be efficiently utilized in brain imaging straightforwardly through intravenous postinjection.

scholarly journals Janus Luminogens with Bended Intramolecular Charge Transfer: Towards Molecular Transistor and Brain Imaging

2021 ◽  
Author(s):  
Qian WU ◽  
Junkai Liu ◽  
Youmei Li ◽  
Michelle Mei Suet Lee ◽  
lianrui hu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Brain Imaging ◽  
Near Infrared ◽  
Intramolecular Charge Transfer ◽  
Infrared Emission ◽  
Related Development ◽  
Challenging Tasks ◽  
Donor Acceptor ◽  
Major Trend ◽  
Molecular Transistor

The ingenious construction of electron donor-acceptor (D-A) system has been proven to be the major trend for novel advanced-performance optoelectronic materials. However, the related development is undiversified and become stereotyped in recent years, and the explorationsof new architecture with both prominentoptoelectronic property and innovatively coined optoelectronic mechanism are appealing yet significantly challenging tasks. We herein exploit a series of novel Janus luminogens, namely TAOs, with unique charge separation in asimple five-membered mesoionic ring.TAOs having low molecular weight present efficient aggregation-induced red/near-infrared emission with up to 21.5% of fluorescence quantum yield. A new mechanism termed as bended intramolecular charge transfer (BICT) is proposed to understand the fluorescence behavior. It is experimentally demonstrated that TAOs exhibit great potential for the use as molecular transistor, and can be efficiently utilized in brain imaging straightforwardly through intravenous postinjection.

Rearrangement of an aniline linked perylene bisimide under acidic conditions and visible to near-infrared emission from the intramolecular charge-transfer state of its fused derivatives

2017 ◽  
Vol 53 (42) ◽  
pp. 5698-5701 ◽  
Author(s):  
Mitsuru Kojima ◽  
Akira Tamoto ◽  
Naoki Aratani ◽  
Hiroko Yamada
Keyword(s):  
Charge Transfer ◽  
Near Infrared ◽  
Intramolecular Charge Transfer ◽  
Infrared Emission ◽  
Charge Transfer State ◽  
Perylene Bisimide ◽  
Acidic Conditions ◽  
Perylene Bisimides ◽  
Near Infrared Emission ◽  
Transfer State

We have prepared a series of aniline-linked and fused perylene bisimides (PBIs) for making near-infrared (NIR) fluorophores.

Janus luminogens with bended intramolecular charge transfer: Toward molecular transistor and brain imaging

Matter ◽  
2021 ◽  
Vol 4 (10) ◽  
pp. 3286-3300
Author(s):  
Qian Wu ◽  
Junkai Liu ◽  
Youmei Li ◽  
Michelle M.S. Lee ◽  
Lianrui Hu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Brain Imaging ◽  
Intramolecular Charge Transfer ◽  
Molecular Transistor

scholarly journals Tuning of Hyperpolarizability, One- and Two-Photon Absorption of D-A and D-A-A Type Intramolecular Charge Transfer Based Sensors

2019 ◽  
Author(s):  
Pralok K. Samanta ◽  
Md Mehboob Alam ◽  
Ramprasad Misra ◽  
Swapan K. Pati
Keyword(s):  
Charge Transfer ◽  
Gas Phase ◽  
Density Functional ◽  
Intramolecular Charge Transfer ◽  
Photon Absorption ◽  
First Hyperpolarizability ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nlo Response ◽  
Donor Acceptor

Solvents play an important role in shaping the intramolecular charge transfer (ICT) properties of π-conjugated molecules, which in turn can affect their one-photon absorption (OPA) and two-photon absorption (TPA) as well as the static (hyper)polarizabilities. Here, we study the effect of solvent and donor-acceptor arrangement on linear and nonlinear optical (NLO) response properties of two novel ICT-based fluorescent sensors, one consisting of hemicyanine and dimethylaniline as electron withdrawing and donating groups (molecule 1), respectively and its boron-dipyrromethene (BODIPY, molecule 2)-fused counterpart (molecule 3). Density functional theoretical (DFT) calculations using long-range corrected CAM-B3LYP and M06-2X functionals, suitable for studying properties of ICT molecules, are employed to calculate the desired properties. The dipole moment (µ) as well as the total first hyperpolarizability (β<sub>total</sub>) of the studied molecules in the gas phase is dominantly dictated by the component in the direction of charge transfer. The ratios of vector component of first hyperpolarizability (β<sub>vec</sub>) to β<sub>total</sub> also reveal unidirectional charge transfer process. The properties of the medium significantly affect the OPA, hyperpolarizability and TPA properties of the studied molecules. Time dependent DFT (TDDFT) calculations suggest interchanging between two lowest excited states of molecule 3 from the gas phase to salvation. The direction of charge polarization and dominant transitions among molecular orbitals involved in the OPA and TPA processes are studied. The results presented are expected to be useful in tuning the NLO response of many ICT-based chromophores, especially those with BODIPY acceptors.<br>

Development of a near-infrared ratiometric fluorescent probe for glutathione using an intramolecular charge transfer signaling mechanism and its bioimaging application in living cells

2019 ◽  
Vol 7 (5) ◽  
pp. 809-814 ◽  
Author(s):  
Yong Zhou ◽  
Li Zhang ◽  
Xuan Zhang ◽  
Zhi-Jia Zhu
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Fluorescent Probe ◽  
Near Infrared ◽  
Intramolecular Charge Transfer ◽  
Living Cells ◽  
Selective Detection ◽  
Signaling Mechanism ◽  
Acetyl Group ◽  
Ratiometric Fluorescent Probe

A novel NIR ratiometric fluorescent probe HBT-GSH was developed for the selective detection of GSH over Cys and Hcy in aqueous solution. The signaling mechanism of the GSH-induced removal of an acetyl group and the switching on of ICT fluorescence was proposed.

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