Qi Fang

Shandong University, Chi-nan-shih, Shandong Sheng, China

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Publications (105)202.98 Total impact

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    ABSTRACT: Two pyrene derivatives were prepared by the condensation between diaminomaleonitrile and 1-pyrene-aldehyde or 2-pyrene-aldehyde. Both of them exhibit high selectivity for Cu2 + and ClO− in combination with significant fluorescence enhancement in certain buffer solutions, respectively.
    Inorganic Chemistry Communications 02/2015; 52. DOI:10.1016/j.inoche.2014.12.011 · 2.06 Impact Factor
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    ABSTRACT: Three 1-phenylindolin-2-one derivatives, namely 1-phenylindolin-2-one, C14H11NO, (I), 5-bromo-1-phenylindolin-2-one, C14H10BrNO, (II), and 5-iodo-1-phenylindolin-2-one, C14H10INO, (III), have been synthesized and their structures determined. Compounds (I) and (II) crystallized in the centrosymmetric space groups Pbca and P21/c, respectively, while compound (III) crystallized in the polar space group Aea2. Density functional theory (DFT) calculations show that the molecular dipole moment gradually decreases in the order (I) > (II) > (III). The relatively smaller dipole moment of (III) and the larger non-electrostatic intermolecular interactions may be the main reasons for the noncentrosymmetric and polar structure of (III).
    01/2015; 71(1). DOI:10.1107/S2053229614026874
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    ABSTRACT: By pi-extending and ring-capping the bis-fused TTF moiety (namely TTP), several electrically conductive crystals of 12-S-atom TTP derivatives have been synthesized: (1) bis(vinylenedithio)-TTP which can be isolated as triclinic P-1 (t-BV-TTP) and monoclinic P21 (m-BV-TTP) polymorphs separately, (2) bis(ethylenedithio)-TTP (BE-TTP), (3) ethylenedithio-methylenedithio-TTP (EM-TTP), (4) ethylenedithio-vinylenedithio-TTP (EV-TTP). The structure of t-BV-TTP and EM-TTP crystals can be classified as all-parallel beta-type, in which all molecules in the same 2-D molecular slab or in different slabs are all parallel packed. Differently, m-BV-TTP and BE-TTP crystals can be described as herring-bone beta-type, in which the molecules in neighbouring 2-D slabs are alternately in two directions. Among the above four beta-type structures, EM-TTP crystal shows highest conductivity (sigma= 7×10-3 omega-1cm-1 along [100] direction). The EV-TTP crystal belongs to a kind of three-by-three kappa-type structure and its conductivity was measured to be 3×10-3 omega-1cm-1 along [100] direction. The calculated hole mobilities of the title TTP derivatives, by DFT method and by the host-caged approach, are larger than that of the dithiophene-TTF (DT-TTF) crystal.
    CrystEngComm 11/2014; 17(4). DOI:10.1039/C4CE01928H · 3.86 Impact Factor
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    ABSTRACT: Three regioisomeric sulfur-bridged pyrene-thienoacenes (PTAs) have been synthesized. The crystal structures and optoelectronic properties of these ring-fused PTAs and their ring-opened precursors have been fully investigated. Among these isomers, the [3,4]-extended compound (4-S-PTA) shows the most pronounced spectral red-shift and highest quantum yield as well as large transistor mobility.
    Organic Letters 01/2014; 16(2). DOI:10.1021/ol402971n · 6.32 Impact Factor
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    ABSTRACT: There are two independent mol-ecules in the asymmetric unit of the title compound, C10H8INO2, which differ in the degree of planarity. The iodo-indoline-2,3-dione skeleton of mol-ecule 1 is essentially planar [mean deviation = 0.003 (2) Å for the nine non-H atoms of the indoline core, with a maximum deviation of 0.033 (1) Å for the I atom]. The I atom and O atom in the 3-position of mol-ecule 2 deviate by 0.195 (1) and 0.120 (2) Å, respectively, from the least-squares plane through the nine non-H atoms of the indoline core. Mol-ecules 1 and 2 are roughly coplanar, the mean planes through their cores making a dihedral angle of 6.84 (1)°. This coplanarity results in a layer-like structure parallel to (6,11,17) in the crystal, the distance between adjacent least-squares planes through the cores of mol-ecules 1 and 2 being 3.37 (1) Å. In such a layer, mol-ecules 1 and 2 are linked by C-H⋯O hydrogen bonds, forming chains along [11-1]. The chains are further coupled to construct a kind of double-chain structure via I⋯O inter-actions [3.270 (2) Å].
    Acta Crystallographica Section E Structure Reports Online 01/2014; 70(Pt 1):o67. DOI:10.1107/S1600536813033539 · 0.35 Impact Factor
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    ABSTRACT: Three aurone derivatives, Z-2-[(4-N,N-dimethylaminophenyl)methylene] benzofuran-3-one (1), Z-2-[(N-ethylcarbazol-3-yl)methylene]benzofuran-3-one (2) and Z-2-[(pyren-1-yl)methylene]benzofuran-3-one (3) have been synthesized by the cyclization of 2'-hydroxychalcones. Their crystal structure, single- and two-photon related absorption and fluorescence properties have been examined. Pumped by 860nm laser pulses in femtosecond regime, the compounds exhibit strong yellow-green two-photon excited fluorescence at 539nm (1), 505nm (2) and 524nm (3) in THF with two-photon absorption (TPA) cross-section being 1536GM (1), 608GM (2) and 236GM (3).
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 11/2012; 103C:120-124. DOI:10.1016/j.saa.2012.11.018 · 2.13 Impact Factor
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    ABSTRACT: Two 3-amidocoumarin derivatives have been utilized as doubly activated Michael acceptors to selectively and sensitively trap cyanide with remarkable colorimetric and fluorescent response. Single-crystal structures of the cyanide adducts clearly confirm Michael additions taking place at the 4-position of coumarin, then an unexpected intramolecular cyclization reaction between the cyano and amido groups occurring.
    Sensors and Actuators B Chemical 11/2012; 174:500–505. DOI:10.1016/j.snb.2012.08.061 · 3.84 Impact Factor
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    ABSTRACT: Three o-hydroxy chalcone derivatives 1–3 with carbazolyl (1), pyrene (2) and 4-nitrobenzene (3) as terminal group have been synthesized. Their crystal structures, photophysical properties in CH3CN and recognition properties for cyanide anions have also been examined. The research indicates that the stronger electroaffinity of the chalcone derivative's β-unit is beneficial to Michael reaction and can improve the response rate of the compound to cyanide anions. These compounds are found to be able to recognize cyanide anions with fluorescence turn-on response. Especially, compound 3 with strong electron accepting group exhibits remarkable response to cyanide anions in CH3CNH2O (1:1, v/v) solution with a ca. 40-fold intensity enhancement.
    Journal of Photochemistry and Photobiology A Chemistry 09/2012; 244:65–70. DOI:10.1016/j.jphotochem.2012.06.012 · 2.29 Impact Factor
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    ABSTRACT: Two thiophene-functionalized octupolar triindole molecules were synthesized through Suzuki and Sonogashira cross-coupling reactions. Their photophysical and electrochemical properties were explored. The spectroscopic data demonstrate that triindole is an excellent rich electronic central donor for building octupolar optoelectronic molecules and possesses excellent luminescent properties. Thiophenylethynyl substituted triindole compound 3,8,13-tri(2-thiophenylethynyl)-5,10,15-tributyltriindole forms an intermolecular aggregation induced by π-π stacking from the rigid coplanar molecular scaffold. The redox curves and results of theoretical calculation imply that the two compounds have low ionization potential and low E(1/2 oxd), which may be originated from the high electronic density of both triindole and thiophene groups.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 08/2012; 96:1020-4. DOI:10.1016/j.saa.2012.08.008 · 2.13 Impact Factor
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    ABSTRACT: The first direct borylation of a C-H bond at the 4-position of pyrene was achieved using [Ir(COD)Cl](2)/dtbpy as the catalyst precursor and B(2)pin(2) as the boron source. The position-related photophysical properties of pyrene derivatives are reported.
    The Journal of Organic Chemistry 07/2012; 77(16):7124-8. DOI:10.1021/jo301293w · 4.64 Impact Factor
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    ABSTRACT: The title mol-ecule, C(4)OS(5), is essentially planar, with an r.m.s. deviation of 0.032 (3) Å. All the C-S single bonds are shorter than the standard Csp(3)-S single-bond length, showing the π-conjugated nature of the molecule. In the crystal, molecules lie parallel to one another and pack in columns along the a axis. Short inter-molecular S⋯S contacts [3.314 (3), 3.482 (2) and 3.501 (2) Å] are observed between the columns. The angle between the two mol-ecular dipole moments in the unit cell is 39.3 (1)° and the macro-polarization vector is along the [1 0 - 1.41] direction. As a result of the high polarization and π-conjugation of the structure, the crystalline powder exhibits a second harmonic generating intensity, which is as strong as that of the urea standard powder crystals, when irradiated by a 1053 nm laser beam. The diffraction space of the crystal showed a nonmerohedral twinning.
    Acta Crystallographica Section E Structure Reports Online 03/2012; 68(Pt 3):o721. DOI:10.1107/S1600536812005703 · 0.35 Impact Factor
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    ABSTRACT: Two novel octupolar organoboron compounds, namely 1,3,5-tris[5-(dimesitylboryl)thiophen-2-yl]terthienobenzene and 1,3,5-tris[4-(dimesitylboryl)phenyl]terthienobenzene, symmetrically extended from terthienobenzene (TTB) with dimesitylboryl groups as electron acceptors have been synthesized. These TTB derivatives exhibited strong blue-green emission in common solvents under single or two-photon excitation (Φfl > 30%), as well as good thermal stability (Tg > 150 °C).
    Synthetic Metals 03/2012; 162(s 3–4):291–295. DOI:10.1016/j.synthmet.2011.12.008 · 2.22 Impact Factor
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    Hua-Wen Wen, Qi Fang
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    ABSTRACT: In the title compound, C(5)H(2)S(4), the terminal monocyclic S atom deviates by 0.117 (1) angstrom from the mean plane of the other non-H atoms (r.m.s. deviation = 0.001 angstrom). All six C-S bonds and the central C-C bond in the rings are characterized by pi-conjugated lengths, endowing the molecule with high pi-conjugation. In the crystal, the molecules are parallel packed, forming columnar stacks along the a axis. Short intermolecular S center dot center dot S contacts [3.397 (1) and 3.486 (1) angstrom], are observed.
    Acta Crystallographica Section E Structure Reports Online 11/2011; 67(Pt 11):o3097. DOI:10.1107/S1600536811044084 · 0.35 Impact Factor
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    ABSTRACT: A trivalent organoboron compound with diethylamino as an electron donor group and dimesitylboryl as an electron acceptor group has been synthesized. Its single- and two-photon excited fluorescence properties have been examined. Pumped by 820nm laser pulses in femtosecond regime, it showed strong two-photon excited fluorescence at 527nm in toluene with two-photon absorption cross-section being 859GM. The compound has been found to be a sensitive chemosensor for fluoride and cyanide anions in THF solutions.
    Journal of Molecular Structure 08/2011; 1000(1):145-149. DOI:10.1016/j.molstruc.2011.06.008 · 1.60 Impact Factor
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    ABSTRACT: Three thiophenevinyl substituted one-, two-, and three-branched truxene π-conjugated compounds TS1, TS2 and TS3 have been prepared using a Heck reaction. Their linear absorption, single- and two-photon excited fluorescence were examined. The three analogues emit blue fluorescence at 420 nm. The number of branches has no influence on the position of the absorption maxima of the charge transfer band and fluorescence emitting maxima. However, the molar extinction coefficients of charge transfer band increase almost linearly with the number of branches. The two-photon absorption cross-section of the octupolar three-branched compound TS3 is several times that of the two-branched compound TS2 and one-branched compound TS1.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 05/2011; 79(5):1112-5. DOI:10.1016/j.saa.2011.04.029 · 2.13 Impact Factor
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    ABSTRACT: A new BEDT-TTF-based radical salt, β-(BEDT-TTF)(HSO4) [BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene], has been synthesized by oxidative electrocrystallization. The crystal structure was determined by four-circle X-ray diffraction. The crystal belongs to monoclinic system, C2/c space group with the unit cell parameters of: a=1.5996(2)nm, b=1.06173(10)nm, c=1.15083(11)nm, β=120.534(8)°, V=1.6834(3)nm3, and R=0.0611. In the title crystal, the BEDT-TTF radicals are stacked to form columns along the [101] axis and the molecular planes of BEDT-TTFs in adjacent columns are parallel to each other. The inter-stack side-by-side S…S short contacts along the b-axis help to form a kind of cationic conducting sheet parallel to (101) plane. The room temperature conductivity at certain direction on (101) plane of β-(BEDT-TTF)(HSO4) single crystal was measured to be 11.7Scm−1. From 100K to 290K, the resistivity–temperature curve demonstrates its typical semiconductivity with an excitation energy of 0.26eV.
    Synthetic Metals 03/2011; 161(5):365-368. DOI:10.1016/j.synthmet.2010.11.035 · 2.22 Impact Factor
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    ABSTRACT: A series of new chromophores, styryl-parent end-capped with various donors, and with barbituric acid, methyl-pyridinium, and methyl-quinolinium as the acceptors, have been synthesized and characterized by element analysis or X-ray diffraction. Using the Z-scan system, their two-photon absorption (TPA) cross-section values (δ) have been determined under excitation with 10 Hz, and 1064 nm, 35 ps mode-locked Nd:YAG laser pulse in DMF with do= 0.05 M. The effective δ value is as high as 10.9 × 10–48 cm4 s per photon for trans-4-(4'-N,N-diphenyl amino) styryl-N-methyl quinolinium iodide (DPASQI). The δ value increases from barbituric acid- to pyridinium- to quinolinium-derivatives apparently due to the increase in both the conjugated degree and planarity; however, when the acceptor is fixed, the δ value increases from dialkyl amino groups to diphenyl amino groups even though the latter is a weaker donor than the dialkyl amino groups. Theoretical calculations confirm that the increased distortion from planarity for the barbituric acid derivative makes its δ value decrease. The relatively large δ value for quinolinium- or pyridinium-derivatives originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment (Δµge) between the S0 and S1, and the transition dipole moment (Mee') between S1 and S2.Key words: two-photon absorption, intramolecular charge transfer, styryl-quinolinium, styryl-pyridinium, styryl-barbituric acid.
    Canadian Journal of Chemistry 02/2011; 79(2):174-182. DOI:10.1139/cjc-79-2-174 · 1.01 Impact Factor
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 12/2010; 30(49). DOI:10.1002/chin.199949011
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    ABSTRACT: Bridging the triindole core and triarylboryl acceptor by an ethenylene linker at the 3,8,13- or 2,7,12-position, the resultant 3-BET and 2-BET show two-photon absorption (TPA) cross sections of δ = 2100 and 2500 GM (at 810 nm by femtosecond pulses in THF), respectively. The TPA enhancement of the 2,7,12-isomers is also found when comparing 3-BYT and 2-BYT (δ = 870 and 1900 GM) and 3-NET and 2-NET (36 and 400 GM).
    Organic Letters 10/2010; 12(22):5192-5. DOI:10.1021/ol102057t · 6.32 Impact Factor
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    ABSTRACT: A series of D–π–D quadrupolar fluorophores with systematically varied π-conjugated cores were prepared using the Heck reaction and their single- and two-photon photophysical properties were examined. Introduction of extended π-conjugated cores such as indenofluorene/indolocarbazole was found to induce only small shifts in the absorption and emission maxima versus the phenylene linked fluorophore but greatly enhance their single- and two-photon absorption cross-sections. The effects of positional substitution on the properties of the indolocarbazole derivatives were also investigated.
    Dyes and Pigments 06/2010; 86(1):63-67. DOI:10.1016/j.dyepig.2009.11.009 · 3.47 Impact Factor

Publication Stats

1k Citations
202.98 Total Impact Points

Institutions

  • 1998–2015
    • Shandong University
      • • State Key Laboratory for Crystal Materials
      • • Institute for Crystal Materials
      Chi-nan-shih, Shandong Sheng, China
  • 2007
    • Durham University
      • Department of Chemistry
      Durham, England, United Kingdom
  • 1999–2003
    • University of Jinan (Jinan, China)
      Chi-nan-shih, Shandong Sheng, China