A5101876090- Photochemistry and Electron Transfer Studies
- Spectroscopy and Quantum Chemical Studies
- Radical Photochemical Reactions
- Free Radicals and Antioxidants
- Organic Light-Emitting Diodes Research
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- DNA and Nucleic Acid Chemistry
- Photochromic and Fluorescence Chemistry
- Photoreceptor and optogenetics research
- Advanced biosensing and bioanalysis techniques
- Luminescence and Fluorescent Materials
- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Molecular Junctions and Nanostructures
- Nanocluster Synthesis and Applications
- Molecular Spectroscopy and Structure
- Catalytic Cross-Coupling Reactions
- Organometallic Complex Synthesis and Catalysis
- Catalytic C–H Functionalization Methods
- Metal complexes synthesis and properties
- Molecular spectroscopy and chirality
- Magnetism in coordination complexes
- Atmospheric Ozone and Climate
- Nanomaterials for catalytic reactions
Xanadu Quantum Technologies (Canada)
2025
Shenzhen University
2015-2024
North China Electric Power University
2022
State Key Laboratory of Synthetic Chemistry
2011-2020
University of Hong Kong
2008-2020
Institute of Molecular Functional Materials
2011-2016
Hong Kong Polytechnic University
2008-2015
University of Georgia
2009-2010
Beijing Normal University
2010
Imperial College London
2000-2007
We report a simple but highly cooperative ensemble with CdS and MoS2 nanocrystals dispersed on graphene sheets: it is demonstrated that can capture light energy facilitate excited electron transfer to for catalytic hydrogen production via the 2-D which plays key role as an efficient mediator.
Photonics offers a promising platform for quantum computing1–4, owing to the availability of chip integration mass-manufacturable modules, fibre optics networking and room-temperature operation most components. However, experimental demonstrations are needed complete integrated systems comprising all basic functionalities universal fault-tolerant operation5. Here we construct (sub-performant) scale model computer using 35 photonic chips demonstrate its functionality feasibility. This...
All that glitters is gold: Highly phosphorescent gold(III) complexes (see picture) with extended π-conjugated cyclometalating ligands exhibit rich photophysical and photochemical properties. They act as efficient photocatalysts/photosensitizers for oxidative functionalizations of secondary tertiary benzylic amines homogeneous hydrogen production from a water/acetonitrile mixture. Detailed facts importance to specialist readers are published "Supporting Information". Such documents...
Ultraviolet irradiation of DNA produces electronic excited states that predominantly eliminate the excitation energy by returning to ground state (photostability) or following minor pathways into mutagenic photoproducts (photodamage). The cyclobutane pyrimidine dimer (CPD) formed from photodimerization thymines in is most common form photodamage. underlying molecular processes governing photostability and photodamage thymine-constituted remain unclear. Here, a combined femtosecond broadband...
By employing broadband femtosecond Kerr-gated time-resolved fluorescence (KTRF) and transient absorption (TA) techniques, we report the first (to our knowledge) combined time- wavelength-resolved study on an ultraviolet-excited nucleoside a single-stranded oligonucleotide (namely adenosine (Ado) adenine oligomer (dA)20) in aqueous solution. With advantages of ultrafast time resolution, broad spectral temporal probe window, high sensitivity, KTRF TA results enable real monitoring...
Photochemistry: A series of emissive gold(III) complexes with fluorene-containing cyclometalating ligands exhibits strong phosphorescence and long-lived excited states emission quantum yields lifetimes up to 58 % 305 μs, respectively. These can sensitize energy up-conversion 9,10-diphenylanthracene (DPA; see picture) display rich two-photon absorption properties (TPA; TTA=triplet–triplet annihilation).
The synthesis, structures and photophysical properties of the charge-neutral Pt(II) complexes (1–6) their Pd(II) (7) Ni(II) (8) congeners supported by tetradentate dianionic bis[phenolate-(N-heterocyclic carbene)] ligands are described. X-ray crystal two solvatomorphs 2, which has p-F substituents on ligand, have been determined. all were examined. In THF solutions, 1–4 display deep blue phosphorescence (λmax = ∼440–460 nm, Φe 3–18% τ 0.5–3.5 μs). solutions at room temperature, 5–8 show...
Luminescent pincer-type Pt(II) complexes supported by C-deprotonated π-extended tridentate RC^N^NR' ligands and pentafluorophenylacetylide show emission quantum yields up to almost unity. Femtosecond time-resolved fluorescence measurements time-dependent DFT calculations together reveal the dependence of excited-state structural distortions [Pt(RC^N^NR')(CC-C6 F5 )] on positional isomers ligand. Pt [Pt(R-C^N^NR')(CC-Ar)] are efficient photocatalysts for visible-light-induced reductive...
Practical strongly phosphorescent platinum(<sc>II</sc>) green to white OLED emitters with bulky tetradentate O^N^C^N ligands.
High performance orange (EQE up to 15.64%) and white 6.88%) solution processed OLEDs fabricated solely with emitters of non-platinum group metals were reported. The device has CIE coordinates (0.42, 0.44) CRI 81.
Palladium(ii) complexes supported by tetradentate [N^C^C^N] and [O^N^C^N] ligand systems display sky blue to red phosphorescence with emission quantum yields lifetimes up 0.64 272 μs, respectively. Femtosecond time-resolved fluorescence (fs-TRF) measurements on these Pd(ii) reveal a fast intersystem crossing from singlet triplet manifolds time constants of 0.6-21 ps. DFT/TDDFT calculations revealed that, as result the spiro-fluorene bridging tertiary amine units ligands, T
A healthy glow: series of palladium(II) complexes with tetradentate O N C ligands (see structure) exhibit intense green phosphorescence and long-lived excited states emission quantum yields lifetimes up to 22 % 122 μs, respectively. The show potential as novel functional materials, promising results in a variety applications, such oxygen sensing, photocatalysis, organic light-emitting diodes. As service our authors readers, this journal provides supporting information supplied by the...
Abstract A high‐performance Kerr gate designed for the suppression of fluorescence in both time‐resolved and steady‐state resonance Raman spectroscopy is described its performance illustrated. This an improved version a system recently, with superior extinction ratio, higher throughput wider usable spectral range. Specially polarizers are essential feature system. The opens ∼4 ps at 1 kHz repetition rate, open state up to ∼40% (excluding Fresnel losses on optical elements), ratio closed 10...
We have constructed a broadband ultrafast time-resolved infrared (TRIR) spectrometer and incorporated it into our existing spectroscopy apparatus, thus creating single instrument capable of performing the complementary techniques femto-/picosecond resonance Raman (TR 3 ), fluorescence, UV/visible/infrared transient absorption spectroscopy. The TRIR employs (150 fs, ∼150 cm −1 FWHM) mid-infrared probe reference pulses (generated by difference frequency mixing near-infrared in type I AgGaS 2...
A series of mononuclear and binuclear gold(I) complexes containing oligo(o- or m-phenyleneethynylene) (PE) ligands, namely [PhC≡C(C(6)H(4)-1,2-C≡C)(n-1)Au(PCy(3))] (n = 2-4, 4a-c), [μ-{C≡C-(1,2-C(6)H(4)C≡C)(n)}{Au(PCy(3))}(2)] 1-6, 8, 5a-g), [PhC≡C(C(6)H(4)-1,3-C≡C)(n-1)Au(PCy(3))] 6a-c), [μ-{C≡C-(1,3-C(6)H(4)C≡C)(n)}{Au(PCy(3))}(2)] 1, 2, 7a,b), were synthesized structurally characterized. Extensive spectroscopic measurements have been performed by applying combined methods femtosecond...
Abstract Luminescent metallo‐intercalators are potent biosensors of nucleic acid structure and anticancer agents targeting DNAs. There few examples luminescent which can simultaneously act as emission probes display promising activities. Herein, we describe a platinum(II) complex, [Pt(C^N^N)(C≡N t Bu)]ClO 4 ( 1 , HC^N^N= 6‐phenyl‐2,2′‐bipyridyl), that intercalates between the nucleobases acids, accompanied by an increase in intensity and/or significant change maximum wavelength. The changes...
Cytosine (Cyt) among all the nucleic acid bases features most complex and least understood nonradiative deactivation, a process that is crucially important for its photostability. Herein, excited state dynamics of Cyt series N1- C5-derivatives, including full set nucleosides nucleotides in DNA RNA 5-methyl cytosine, 5-methylcytidine 2'-deoxy-5-methylcytidine, have been investigated water methanol employing femtosecond broadband time-resolved fluorescence coupled with fs transient absorption...
A new class of cyclometalated Au(III) complexes containing various bidentate C-deprotonated C^N and cis-chelating bis(N-heterocyclic carbene) (bis-NHC) ligands has been synthesized characterized. These are the first examples supported by bis-NHC ligands. [Au(C^N)(bis-NHC)] display emission in solutions under degassed condition at room temperature with maxima (λmax ) 498-633 nm quantum yields up to 10.1 %. The emissions assigned triplet intraligand (IL) π→π* transitions complex a...
Abstract The synthesis, excited‐state dynamics, and applications of two series air‐stable luminescent tungsten(VI) complexes are described. These show phosphorescence in the solid state solutions with emission quantum yields up to 22 % thin film (5 mCP) at room temperature. Complex 2 c , containing a 5,7‐diphenyl‐8‐hydroxyquinolinate ligand, displays prompt fluorescence (blue–green) (red) comparable intensity, which could be used for ratiometric sensing. Solution‐processed organic...
Picosecond time-resolved resonance Raman spectra of the A (intramolecular charge transfer, ICT) state DMABN, DMABN-d6 and DMABN-15N have been obtained. The isotopic shifts identify νs(ph-N) mode as a band at 1281 cm-1. ∼96 cm-1 downshift this from its ground frequency rules out electronic coupling PICT model unequivocally supports decoupling TICT model. However, our results suggest some pyramidal character amino conformation.
Anomalies in the fluorescence spectra of dual molecules explained? A comparison time-resolved IR absorption CN band photoexcited 4-dimethylaminobenzonitrile MeCN and MeOH provides first direct observation formation a hydrogen-bonded intramolecular charge-transfer (ICT) state its coexistence with "free" ICT (see picture). The so-called will be triple, not dual.
A combined femtosecond Kerr gated time-resolved fluorescence (fs-KTRF) and picosecond resonance Raman (ps-KTR(3)) study is reported for two p-hydroxyphenacyl (pHP) caged phototriggers, HPDP HPA, in neat acetonitrile water/acetonitrile (1:1 by volume) solvents. Fs-KTRF spectroscopy was employed to characterize the spectral properties dynamics of singlet excited states, ps-KTR(3) used monitor formation subsequent reaction triplet state. These results provide important evidence elucidation...
The kinetics and mechanism of the photodeprotection rearrangement reactions for pHP phototrigger compounds p-hydroxyphenacyl diethyl phosphate (HPDP) diphenyl (HPPP) were studied using transient absorption (TA) picosecond time-resolved resonance Raman (ps-TR3) spectroscopy. TA spectroscopy was employed to detect dynamics triplet precursor decay as well investigate influence solvent leaving group on quenching process. Ps-TR3 used directly monitor formation photosolvolytic product its...
The nature and dynamics of DNA excited states is pivotal importance in determining both ultraviolet photostability its vulnerability toward photodamage. complexity regarding the involvement "bright" "dark" states, their molecular origin, roles played by these course electronic energy relaxation constitute an active contentious area current research states. As a case study, we report here combined broadband femtosecond time-resolved fluorescence (TRF) transient absorption (TA) study on...