Chun-Hui Huang

Fudan University, Shanghai, Shanghai Shi, China

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Publications (101)259.87 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A new Ru(II) complex of [Ru(phen)(2)(Hcdpq)](ClO(4))(2) {phen = 1,10-phenanthroline, Hcdpq = 2-carboxyldipyrido[3,2-f:2',3'-h]quinoxaline} was synthesized and characterized. The spectrophotometric pH and calf thymus DNA (ct-DNA) titrations showed that the complex acted as a dual molecular light switch for pH and ct-DNA with emission enhancement factors of 17 and 26, respectively. It was shown to be capable of distinguishing ct-DNA from yeast RNA with this binding selectivity being superior to two well-known DNA molecular light switches of [Ru(bpy)(2)(dppz)](2+) {bpy =2,2'-bipyridine, and dppz = dipyrido-[3,2-a:2',3'-c]phenazine}and ethidium bromide. The complex bond to ct-DNA probably in groove mode with a binding constant of (4.67 ± 0.06) × 10(3) M(-1) in 5 mM Tris-HCl, 50 mM NaCl (pH = 7.10) buffer solution, as evidenced by UV-visible absorption and luminescence titrations, the dependence of DNA binding constants on NaCl concentrations, DNA competitive binding with ethidium bromide, and emission lifetime and viscosity measurements. To get insight into the light-switch mechanism, theoretical calculations were also performed by applying density functional theory (DFT) and time-dependent DFT.
    Inorganic Chemistry 06/2011; 50(14):6425-36. · 4.59 Impact Factor
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    ABSTRACT: The neutral dimer complex Re2(CO)6(BIZ)2 was directly obtained from a simple reaction between Re(CO)5Cl and N∩OH-type ligand 2-(1-phenyl-1H-benzoimidazol-2-yl)phenol (HBIZ). The further reaction of Re2(CO)6(BIZ)2 with pyridine (Py) led to the monomeric Re(CO)3(BIZ)(Py), which was characterized by means of single-crystal X-ray diffraction analysis, 1H NMR, elemental analysis, and UV−visible absorption, photoluminescence, and infrared spectroscopy as well as cyclic voltammetry. The photoelectrochemical properties of Re(CO)3(BIZ)(Py) spin-coated film modified indium−tin oxide electrode were investigated, and a large cathodic photocurrent up to 0.55 μA/cm2 at −0.3 V bias potential was observed. The LUMO and HOMO energy levels of Re(CO)3(BIZ)(Py) were studied by density functional theory calculations. The possible mechanism of the photocurrent generation was discussed.
    Organometallics 01/2011; 30(4):712–716. · 4.15 Impact Factor
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    ABSTRACT: Two novel niclosamide derivatives were synthesized by adding polyethylene glycol groups of differing lengths to a niclosamide core. The modified niclosamide derivatives were characterized using 1H NMR and HRMS spectra. Anti-cercarial bioactivity results showed that the niclosamide derivative constructed to float on the surface of the water was able to kill cercariae when the number of hydrophilic groups was >3. A fluorescent niclosamide derivative containing naphthalimide was further synthesized to observe the interaction between the cercaricide and Schistosoma japonicum cercariae. Confocal fluorescence microscopy revealed that the fluorescent niclosamide derivative could easily penetrate into the cercarial body beyond the circulatory system leading to the rapid death of cercariae.
    Dyes and Pigments - DYE PIGMENT. 01/2011; 88(3):326-332.
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    ABSTRACT: A liquid crystalline discotic triphenylene-containing side chain ladder-like polysiloxane (LPS) derivative was prepared by hydrosilylation. The superstructure was investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and isotherm surface pressure (π)-area (A) diagrams based on LB-film experiments. The XRD results suggest that the discotic triphenylene units in the side chains stack to form a columnar structure and the columns further align with each other to form a board-like superstructure because of the semi-rigidity of the ladder-like backbone. This suggestion has been confirmed by parallel nanowire-like stripes observed in the AFM image. Mixing small amounts of the corresponding low molar mass molecules with the polymer leads to a more ordered and denser columnar stacking, as shown by sharpened XRD patterns and a π-A curve with a steeper slope, higher collapse pressure and lower collapse area than those obtained either for the low molar mass molecules or the polymer individually.
    Liquid Crystals. 11/2010; March 2003(Vol. 30):391-397.
  • Jiang-Bin Xia, Fu-You Li, Chun-Hui Huang
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    ABSTRACT: Dodecylbenzenesulfonate (DBS)-capped TiO2 nanoparticles have been synthesized and employed in dye-sensitized solar cells to form a quasi-solid state electrolyte. Owing to the long alkyl-chain capping around the TiO2 nanoparticles interacting with the liquid solvent, the dye sensitized solar cell based on such DBS-capped TiO2 nanoparticle framework material gel electrolyte shows higher stability compared with the non-capped one in the long-term application and gives a comparable overall efficiency of 6.3% at AM 1.5 illumination.
    Chinese Journal of Chemistry 08/2010; 22(7):687 - 690. · 0.92 Impact Factor
  • Zhu-qi Chen, Zu-qiang Bian, Chun-hui Huang
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    ABSTRACT: Iridium complexes are drawing great interest because they exhibit high phosphorescence quantum efficiency. Extensive efforts have been devoted to the molecular design of ligands to achieve phosphorescent emission over a wide range of wavelengths that is compatible with many applications. In this research news article, we focus on materials design to improve the performance of phosphorescent Ir(III) complexes for organic light-emitting diodes (OLEDs), luminescence sensitizers, and biological imaging.
    Advanced Materials 04/2010; 22(13):1534-9. · 14.83 Impact Factor
  • Zhu-Qi Chen, Fei Ding, Zu-Qiang Bian, Chun-Hui Huang
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    ABSTRACT: Two structurally simple Iridium(III) complexes with pyrimidin-imidazole derivatives as the ancillary ligands (Ir1 and Ir2) were synthesized. Photophysical studies showed that the iridium complexes have suitable triplet energy levels for sensitizing NdIII. The efficient energy transfer from IrIII moiety to NdIII is observed in both solutions and films. Utilizing co-deposition film of Ir–Nd assemblies as the emitting layer, nondoped OLEDs were fabricated. EL devices with a structure of NPB (1,4-bis((1-naphthylphenyl)amino)biphenyl, 30 nm)/Ir1-Nd(PMIP)3 (1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone, 1:1, 40 nm)/BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, 10 nm)/Alq3 (tris(8-hydroxyquinoline), 30 nm) exhibited a NIR emission from NdIII ions. The highest EQE achieved is 0.3%, with a maximum radiance of 6.1 μW cm−2 at the main emission wavelength of 1060 nm. This result provides a useful guidance for the future work of lanthanide complexes based NIR OLEDs.
    Organic Electronics 03/2010; 11(3):369–376. · 3.84 Impact Factor
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    ABSTRACT: This article reviews progress in the research of transition metal–lanthanide (d–f) bimetallic complexes. Through efficient energy transfer, sensitized luminescence of lanthanide ions from the visible range (EuIII) to the near-infrared region (NdIII, YbIII, ErIII and PrIII) is obtained in these bimetallic assembles. The d-block in d–f bimetallic complexes mainly contributes to the improvement of lanthanide emission efficiency and the extension of the excitation window for the lanthanide complexes. Examples are catalogued by various transition metals, such as RuII, OsII (FeII), PtII (AuI), PdII, ReI, CrIII, CoIII, ZnII and IrIII. The relevant synthetic procedures, crystal structures and photophysical properties of these d–f complexes are briefly described. Additionally, the molecular properties responsible for the performance of certain d–f systems, such as energy levels, nuclear distances and coordination environments, will be discussed.
    Coordination Chemistry Reviews. 01/2010;
  • Bin Lou, Zhu-Qi Chen, Zu-Qiang Bian, Chun-Hui Huang
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    ABSTRACT: A new molecule, (Z)-4-(4-(dimethylamino)benzylidene)-3-methyl-1-(pyridin-2-yl)-1H-pyrazol-5(4H)-one (dmpp), and its novel heteroleptic iridium(III) complex, [(ppy)2Ir(dmpp)]PF6, were synthesized and characterized. Both dmpp and [(ppy)2Ir(dmpp)]PF6 could be used as highly selective and sensitive chemodosimeters for the cyanide anion by the naked eye, owing to the addition of the CN− to the vinyl group of dmpp. The addition of CN− to a solution of dmpp induced a change in the solution color from yellow to colorless, and to [(ppy)2Ir(dmpp)]PF6 induced a change in the solution color from pink to colorless. Moreover, [(ppy)2Ir(dmpp)]PF6 could also act as a phosphorescent and electrochemical probe of CN−. The green phosphorescence band at 520 nm and a new irreversible oxidation wave at 0.423 V showed up upon the addition of CN−, indicating that [(ppy)2Ir(dmpp)]PF6 was an excellent multisignaling chemodosimeter of CN−. Importantly, the Ir complex-based cyanide chemodosimeter [(ppy)2Ir(dmpp)]PF6 has much easier and faster detection of CN− than pure organic molecule dmpp.
    New Journal of Chemistry 01/2010; 34(1). · 2.97 Impact Factor
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    ABSTRACT: Rare-earth up-converting nanophosphors (UCNPs) have great potential to become a new generation of biological luminescent labels, but their use has been limited by difficulties in obtaining water-soluble UCNPs bearing appropriate functional groups. To address this problem, we report herein a simple and efficient procedure for the preparation of amine-functionalized UCNPs by a modified hydrothermal microemulsion route assisted with 6-aminohexanoic acid. The amine content of the resultant UCNPs has been determined to be (9.5+/-0.8) x 10(-5) mol/g, which not only confers excellent dispersibility in aqueous solution, but also allows further conjugation with targeted molecules such as folic acid (FA) as a ligand. By means of the laser scanning up-conversion luminescence microscopy (LSUCLM) and the in vivo up-conversion luminescence (UCL) imaging under excitation at the CW infrared laser at 980 nm, FA-coupled UCNPs have been demonstrated to be effective in targeting folate-receptor overexpressing HeLa cells in vitro and HeLa tumor in vivo and ex vivo. These results indicated that our UCNPs could be used as whole-body targeted UCL imaging agents.
    Biomaterials 07/2009; 30(29):5592-600. · 8.31 Impact Factor
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    ABSTRACT: A new cyclometalated ligand 1,3-dimethyl-5-phenyl-1H-[1,2,4]-triazole (pdt) was designed and synthesized. And the corresponding IrIII complex Ir(pdt)2(phen5f) (phen5f stands for 4,4,5,5,5-pentafluoro-1-(1′,10′-phenanthrolin-2′-yl)-pentane-1,3-dionate) was obtained. According to the measurement of the lowest triplet state energy level of Ir(pdt)2(phen5f), it is suitable for sensitizing NIR (near-infrared) lanthanide ions instead of EuIII. The bimetallic complex [(pdt)2Ir(μ-phen5f)YbCl2·2CH3CH2OH·H2O]Cl was synthesized by the approach of “complexes as ligands”. Data showed that the emission quenching was observed in the solid state when the IrIII–YbIII complex was compared with the IrIII complex, which implied that energy transfer might occur from IrIII complex-ligand to YbIII ion. Upon irradiation of the MLCT (metal-to-ligand charge transfer) absorption of Ir(pdt)2(phen5f), the characteristic emission of YbIII was obtained with the peak around 978nm.
    Polyhedron 01/2009; 28(5):897-902. · 2.05 Impact Factor
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    ABSTRACT: Two novel iridium-europium bimetallic complexes, {[(dfppy)2Ir(mu-phen5f)]3EuCl}Cl2 and (dfppy)2Ir(mu-phen5f)Eu(TFAcA)3 [dfppy represents 2-(4',6'-difluorophenyl)-pyridinato-N,C(2'), phen5f stands for 4,4,5,5,5-pentafluoro-1-(1',10'-phenanthrolin-2'-yl)-pentane-1,3-dionate and TFAcA represents trifluoroacetylacetonate], were successfully synthesized. The novel ligand Hphen5f with four coordination sites was designed as a bridge to link the Ir (III) center and the Eu (III) center. The X-ray diffraction data shows that the nonbonding distances for Eu...Ir are 6.028, 5.907, and 6.100 A in the bimetallic complex {[(dfppy)2Ir(mu-phen5f)]3EuCl}Cl2. Photophysical studies implied that the high efficient red luminescence from the Eu (III) ion was sensitized by the (3)MLCT (metal-to-ligand charge transfer) energy based on an Ir (III) complex-ligand in a d-f bimetallic assembly. The excitation window for the new bimetallic complex {[(dfppy)2Ir(mu-phen5f)]3EuCl}Cl2 extends up to 530 nm (1 x 10(-3) M in EtOH), indicating that this bimetallic complex can emit red light under the irradiation of sunlight.
    Inorganic Chemistry 05/2008; 47(7):2507-13. · 4.59 Impact Factor
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    ABSTRACT: The iridium(III) complex Ir(ppy)2(phen5f) [ppy = 2-phenylpyridinato-N,C2′, and phen5f = 4,4,5,5,5-pentafluoro-1-(1′,10′-phenanthrolin-2′-yl)-pentane-1,3-dionate] has been synthesised and used as “complex ligands” to make heteronuclear d–f complexes by the attachment of Ln(NO3)3·xH2O at the vacant coordination sites in the bridging ligand phen5f. The microanalyses and crystal structure characteristics confirmed the formation of the heteronuclear Ir2Ln arrays. The measurement of the lowest triplet state energy level of Ir(ppy)2(phen5f) indicates that it is suitable for the NIR (near-infrared) lanthanide ions, NdIII, YbIIIand ErIII. Upon irradiation of the MLCT (metal-to-ligand charge transfer) absorption of Ir(ppy)2(phen5f) at an excitation wavelength from 380–490 nm, the characteristic emission spectra of the three Ir2Ln arrays (Ln = Nd, Yb, Er) in both the solid state and in CH3CN solution were measured. According to the results, more IrIII complexes will be designed for lanthanide NIR emission by the proper combination between the cyclometalated ligand and the tetradentate ancillary ligand.
    Dalton Transactions 01/2008; · 3.81 Impact Factor
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    ABSTRACT: A new kind of 1-phenyl-3-methyl-4-octadecyl-5-pyrazolone (PMOP)-capped ZnO nanoparticle has been synthesized and characterized with UV–VIS, IR and fluorescent spectra. The material was used as a framework to form a quasi-solid-state electrolyte and employed in dye-sensitized solar cell (DSSC). Since the long alkyl-chain of PMOP interacts with liquid solvent, the quasi-solid-state DSSC with PMOP-capped nanoparticles shows higher stability in comparison with that of the liquid device and gives a comparable overall efficiency of 6.8% under AM 1.5 illumination.
    Journal of Materials Science 07/2007; 42(15):6412-6416. · 2.16 Impact Factor
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    ABSTRACT: Anthraquinone derivatives with different substituents 1–3 were synthesized by introducing the urea group. Their cations' binding properties were investigated by UV–vis absorption spectroscopy. Compared with 1 and 2, 3 with electron-withdrawing group (–NO2) showed a remarkable absorption change for Hg2+ over the other metal ions. The anthraquinone moiety and the N–H fragment of the urea moiety played key roles in sensing Hg2+. The different acidity of N–H fragments of the urea moiety, caused by electron push–pull properties of the substituents on the phenyl para position, is the main reason for recognition.
    Tetrahedron. 07/2007; 63(29):6732–6736.
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    ABSTRACT: The title compound, [RuCl(C10H14)(C16H12N2O)]Cl·CHCl3, has been synthesized by the reaction of [RuCl2(p-cymene)]2 with 6-(2-hydroxyphenyl)-2,2′-bipyridine in acetonitrile. The RuII cation is in a pseudo-octahedral environment formed by a chloride anion, a cymene molecule (with an η6 coordination mode) and a chelating 6-(2-hydroxyphenyl)-2,2′-bipyridine ligand. The other chloride anion is uncoordinated but links with the complex via O—H...Cl hydrogen bonding. The two methyl groups of the isopropyl group are disordered over two positions in approximately a 0.7:0.3 ratio.
    Acta Crystallographica Section E Structure Reports Online 01/2007; 63(7). · 0.35 Impact Factor
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    ABSTRACT: A series of 8-hydroxyquinoline azo derivatives with diverse conjugated structures were synthesized and studied to chromogenically detect anions. All the dyes allowed selective detection for fluoride anion in CH3CN via instant deprotonation of the compounds, which was affirmed by UV-Vis absorption and 1H NMR spectra. The chromogenically responding ability increases as the substituent changes from phenyl to naphthyl or anthryl. This result is likely to be related to the enhancement of intramolecular charge transfer (ICT) induced by extension of conjugated structure.
    Chinese Journal of Chemistry 01/2007; 25(5):616-622. · 0.92 Impact Factor
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    ABSTRACT: 1,3-diphenyl-5-(2-pyrenyl)-2-pyrazoline (DPP) has been synthesized and used as the emitter material in the electroluminescence (EL) devices. The blue emission from DPP in the indium-tin-oxide (ITO)/diamine/DPP/8-hydroxyquinoline aluminum (ALQ)/A1 device is electric strength dependent and is explained by the electron tunneling injection model. The energy levels used in this model were determined by thin film electrochemistry. The device shows blue electroluminescence with luminance 2400 cd/m2 at 18 V and efficiency 0.23 Im/W at 1.27 mA/cm2.
    Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals. 09/2006; 337(1):333-336.
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    ABSTRACT: Azo 8-hydroxyquinoline benzoate (2) was synthesized and studied to detect metal ions. Distinct color change was found for compound 2 in the presence of transition metal ions Hg2+ or Cu2+ in CH3CN, respectively, which makes it possible for distinguishing Hg2+ and Cu2+ from other metal ions by the ‘naked eye’.
    Tetrahedron Letters 09/2006; 47(36):6413–6416. · 2.40 Impact Factor
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    ABSTRACT: A surfactant ion-pair complex, [Ru(bpy)(2)L][Eu(NTA)(4)](2) (in which L = 1-docosyl-2-(2- pyridyl)benzimidazole, bpy = 2,2'-bipyridine, and NTA = 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedionato) has been synthesized. The surface pressure-area isotherm measurements show that the complex forms a stable Langmuir film at the air-water interface without adding any electrolytes into the subphase. The monolayers formed at the surface pressures of 5 mN m(-1) and 20 mN m(-1), have been successfully transferred onto glass and quartz substrates with the transfer ratios close to unity. The Langmuir-Blodgett films were studied by UV-visible, infrared, and emission spectroscopies, atomic force microscopy, and cyclic voltammetry. The optical, redox, and morphology properties of the LB films were found to be significantly affected by the target surface pressures used for the film depositions.
    The Journal of Physical Chemistry B 05/2006; 110(14):7402-8. · 3.61 Impact Factor

Publication Stats

640 Citations
259.87 Total Impact Points

Institutions

  • 2005–2011
    • Fudan University
      • • Department of Chemistry
      • • Lab of Advanced Materials
      Shanghai, Shanghai Shi, China
  • 2003–2011
    • Beijing Normal University
      • • College of Chemistry
      • • Department of Chemistry
      Beijing, Beijing Shi, China
  • 2010
    • Beijing University of Technology
      Peping, Beijing, China
  • 1997–2010
    • Peking University
      • • National Laboratory of Rare Earth Material Chemistry and Application
      • • Beijing National Laboratory for Molecular Science
      • • Department of Physics
      Beijing, Beijing Shi, China