A5101753965- Asymmetric Hydrogenation and Catalysis
- Asymmetric Synthesis and Catalysis
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Synthetic Organic Chemistry Methods
- Surface Chemistry and Catalysis
- Conducting polymers and applications
- Catalytic C–H Functionalization Methods
- Advanced Polymer Synthesis and Characterization
- Organic Electronics and Photovoltaics
- Crystallography and molecular interactions
- Catalysis for Biomass Conversion
- Perovskite Materials and Applications
- Chemical Synthesis and Analysis
- Carbon dioxide utilization in catalysis
- Fuel Cells and Related Materials
- Synthesis and Catalytic Reactions
- Chemical Synthesis and Reactions
- Organometallic Complex Synthesis and Catalysis
- Axial and Atropisomeric Chirality Synthesis
- Covalent Organic Framework Applications
- Cyclopropane Reaction Mechanisms
- Chemical synthesis and alkaloids
- Ferrocene Chemistry and Applications
- Molecular Spectroscopy and Structure
Beijing University of Posts and Telecommunications
2023-2025
Shanghai Jiao Tong University
2015-2024
North China Electric Power University
2024
State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing
2024
Wuhan University
2024
China Electric Power Research Institute
2024
China Shipbuilding Industry Corporation (China)
2024
Chinese Academy of Sciences
2014-2023
National Astronomical Observatories
2021-2023
Changchun Observatory
2021-2023
To simultaneously achieve low photon energy loss (Eloss) and broad spectral response, the molecular design of wide band gap (WBG) donor polymer with a deep HOMO level is critical importance in fullerene-free solar cells (PSCs). Herein, we developed new benzodithiophene unit, i.e., DTBDT-EF, conducted systematic investigations on WBG DTBDT-EF-based polymer, namely, PDTB-EF-T. Due to synergistic electron-withdrawing effect fluorine atom ester group, PDTB-EF-T exhibits higher oxidation...
Fullerene-free organic solar cells show over 11% power conversion efficiency, processed by low toxic solvents. The applied donor and acceptor in the bulk heterojunction exhibit almost same highest occupied molecular orbital level, yet very efficient charge creation. As a service to our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical support...
Recently, the benzodithiophene- (BDT-) based polymers with conjugated side groups attracted considerable attention due to their superior properties in polymer solar cells (PSCs), so investigation of chain effects on photovoltaic this type is an interesting and important topic for molecular design. Herein, three BDT thieno[3,4-b]thiophene units furan, thiophene selenophene as groups, named PBDTTT-EFF, PBDTTT-EFT, PBDTTT-EFS, were synthesized applied cells. The characterized parallel by...
Hydrogen-bond-activated C-N bond cleavage of allylic amines was realized in Pd-catalyzed alkylation to form the C-C product. The method could be expanded a series and carbonyl compounds with excellent results. It provides new convenient access formation based on by using only inexpensive alcohol solvents.
Two wide band gap polymer donors were developed for fullerene-free solar cells. The photovoltaic performance of the PB3T:IT-M device processed by anisole achieved a high PCE 11.9%.
Abstract Allylic alcohols were directly used in Pd‐catalyzed allylic alkylations of simple ketones under mild reaction conditions. The proceeded smoothly at 20 °C by the concerted action a Pd catalyst, pyrrolidine co‐catalyst, and hydrogen‐bonding solvent, does not require any additional reagents. A computational study suggested that methanol plays crucial role formation π‐allylpalladium complex lowering activation barrier.
Abstract The asymmetric transfer and pressure hydrogenation of various unsaturated substrates provides a succinct pathway to important chiral intermediates products such as alcohols, amines, alkanes. use earth‐abundant transition metals Fe, Co, Ni, Cu in reactions an attractive alternative traditionally used Ru, Rh, Ir, Pd because they are comparatively inexpensive, less toxic, their name suggests, more abundant nature. Earth‐abundant metal‐catalyzed is rapidly becoming area research. This...
Here, taking a polythiophene derivative (PBDD4T) as starting polymer, we tried to increase the rotation barrier and hence stabilize its backbone conformation by introducing fluorine into β- β′-position of α-linked bithiophene segments then synthesized new polymer named PBDD4T-2F. Our results demonstrate that between significantly increases after fluorination, so PBDD4T-2F has more stable than PBDD4T. Compared PBDD4T, shows stronger aggregation effect in solution state compact π–π stacking...
C–O bond cleavage of allylic alkyl ether was realized in a Pd-catalyzed hydrogen-bond-activated alkylation using only alcohol solvents. This procedure does not require any additives and proceeds with high regioselectivity. The applicability this transformation to variety functionalized substrates also investigated. Furthermore, methodology can be easily extended the asymmetric synthesis enantiopure products (99% ee).
We present the synthesis and photovoltaic application of four conjugated polymers composed benzo[1,2-b:4,5-b′]dithiophene (BDT)-based 2,3-diphenyl-5,8-di(thiophen-2-yl)quinoxaline (DTQx)-based units. Fluorination DTQx units side groups BDT unit shows synergistic effect on molecular energy level modulation polymers, as a result, polymer PBQ-4 exhibits deepest HOMO LUMO levels in these polymers. The characterizations properties solar cells (PSCs) based reveal that fluorination has little...
Abstract Heterogeneous oxides with multiple interfaces provide significant advantages in electrocatalytic activity and stability. However, controlling the local structure of these is challenging. In this work, unique heterojunctions are demonstrated based on two oxide types, which formed via pyrolysis a ruthenocene metal–organic framework (Ru‐MOF) at specific temperatures. The resulted Ru‐MOF‐400 exhibits excellent activity, an overpotential 190 mV current density 10 mA cm −2 0.1 m HClO 4 ,...
Abstract Asymmetric sequential hydrogenations of α ‐methylene γ ‐ or δ ‐keto carboxylic acids are established in one‐pot using a bimetallic Ru/Ru catalyst system, achieving the stereodivergent synthesis all four stereoisomers both chiral and ‐lactones with two non‐vicinal carbon stereocenters high yields (up to 99%) excellent stereoselectivities >99% ee >20:1 dr). The compatibility Ru systems is investigated detail, it found that basicity reaction system plays key role hydrogenation...
Palladium-catalyzed asymmetric allylic alkylation of ketones, via enamines generated in situ as nucleophiles, were carried out smoothly with chiral metallocene-based P,N-ligands. Under the same conditions, however, reactions aldehydes could hardly be observed. Subsequently, this obstacle was resolved by using P,P-ligands. Both ketones and afforded excellent enantioselectivities up to 98% ee 94% ee, respectively.
First hand: The first example of a palladium-catalyzed asymmetric hydrogenation α-acyloxy ketones (1) was accomplished to give the hydrogenated products 2 with by far highest catalytic efficiency in up quantitative conversions and excellent enantioselectivities. could serve as important intermediates for preparation many drug candidates. TFE=2,2,2-trifluoroethanol.
A Pd-catalyzed asymmetric allylic alkylation of azlactones with 4-arylvinyl-1,3-dioxolan-2-ones was developed, providing "branched" chiral α-amino acids vicinal tertiary and quaternary stereocenters, in high yields excellent selectivities. Mechanistic studies revealed that the formation a hydrogen bond between Pd-allylic complex azlactone isomer is responsible for regioselectivities. This can be carried out on gram scale without loss catalytic efficiency, resulting product further...
Ferrocene- and ruthenocene-based planar chiral ligands have been developed used in transition-metal-catalyzed asymmetric allylic substitutions, hydrogenations, conjugate addition reactions. The most common ferrocene ligands, which bis(oxazoline) substituents on the cyclopentadiene rings, modified to create new <i>C</i> <sub>2</sub>-symmetric some of shown excellent potential aforementioned A series ruthenocene also their activities differ from those counterparts. 1 Introduction 2 Design...
Abstract Ternary strategies have attracted extensive attention due to their potential in improving power conversion efficiencies (PCEs) of single‐junction polymer solar cells (PSCs). In this work, a novel wide bandgap donor ( E g opt ≈ 2.0 eV) named PBT(E)BTz with deep highest occupied molecular orbital (HOMO) level (≈−5.73 is designed and synthesized. first incorporated as the third component into classic PBDB‐T‐SF:IT‐4F binary PSC system fabricate efficient ternary PSCs. A higher PCE...
A highly efficient Ru-catalyzed asymmetric hydrogenation of α,β-unsaturated γ-lactams has been developed by using a
Conjugated polymers have rigid backbones and strong interchain π–π interaction in aggregation state, so their morphologies thin films could be significantly affected by backbone conformation. In this work, taking two highly efficient photovoltaic (PDTBT-TT PBT4T) as example, we investigated the correlations among chemical structure of units, thermodynamic stability conformation, curvature, phase transformation kinetics, crystalline properties utilizing quantum chemistry calculation,...
Asymmetric hydrogenation of various α-substituted acrylic acids was carried out using RuPHOX–Ru as a chiral catalyst under 5 bar H2, affording the corresponding propanic in up to 99% yield and 99.9% ee. The reaction could be performed on gram-scale with relatively low loading (up 5000 S/C), resulting product (97%, 99.3% ee) can used key intermediate construct bioactive molecules. asymmetric protocol successfully applied an synthesis dihydroartemisinic acid, required for industrial...
Modulation of the electron donating and accepting properties organic semiconductors is an important topic in field photovoltaics. Although small-molecule (SMs) with A-D-A structure can act as either donor or acceptor photovoltaic (OPV) devices, reason why molecules similar conjugated structures play different roles remains unclear. In this work, we designed synthesized two SMs named BTCN-O BTCN-M, which have identical backbone differ alkyl substitution position. BTCN-M demonstrate optical...
Rh-catalyzed sequential asymmetric hydrogenations of 3-amino-4-chromones have been achieved for the first time via an unprecedented dynamic kinetic resolution under neutral conditions, providing (S,R)-3-amino-4-chromanols in high yields (up to 98%) with excellent enantio- and diastereoselectivities 99.9% ee 20:1 dr). The mechanistic studies based on control experiments density functional theory (DFT) calculations suggest that process intermediate enantiomers generated hydrogenation step...
The 1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> Workshop on Maritime Computer Vision (MaCVi) 2023 focused maritime computer vision for Unmanned Aerial Vehicles (UAV) and Surface Vehicle (USV), organized several subchallenges in this domain: (i) UAV-based Object Detection, (ii) Mar-itime Tracking, (iii) USV-based Obstacle Segmentation (iv) Detection. were based the SeaDronesSee MODS benchmarks. This report summarizes main findings...
Abstract Transition metal-catalyzed asymmetric hydrogenation is one of the most efficient methods for preparation chiral α-substituted propionic acids. However, research on this method, employing cleaner earth-abundant metal catalysts, still insufficient in both academic and industrial contexts. Herein, we report an nickel-catalyzed acrylic acids affording corresponding with up to 99.4% ee (enantiomeric excess) 10,000 S/C (substrate/catalyst). In particular, method can be used obtain ( R...