Qi Fang

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

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Publications (95)152.25 Total impact

  • [Show abstract] [Hide abstract]
    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; · 6.14 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. · 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. · 1.98 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. · 1.98 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. · 4.56 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. · 2.11 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. · 0.35 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) Å from the mean plane of the other non-H atoms (r.m.s. deviation = 0.001 Å). All six C-S bonds and the central C-C bond in the rings are characterized by π-conjugated lengths, endowing the mol-ecule with high π-conjugation. In the crystal, the mol-ecules are parallel packed, forming columnar stacks along the a axis. Short inter-molecular S⋯S contacts [3.397 (1) and 3.486 (1) Å], are observed.
    Acta Crystallographica Section E Structure Reports Online 11/2011; 67(Pt 11):o3097. · 0.35 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. · 1.98 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. · 0.96 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 01/2011; 1000(1):145-149. · 1.40 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.
    Lancet. 01/2011; 161(5):365-368.
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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. · 6.14 Impact Factor
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    ABSTRACT: Several organic salts with D-A molecular structure and different counterion have been prepared and experimentally investigated. The two-photon induced frequency-upconverted spectra and two-photon pumped lasing are measured for the organic salt solutions in various solvents. The results indicate that counterions have influence on their stability and lasing property.
    Chinese Journal of Chemistry 08/2010; 19(4):371 - 377. · 0.92 Impact Factor
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    ABSTRACT: In the title one-dimensional coordination polymer, {[Mn(C(5)O(5))(C(10)H(8)N(2))(H(2)O)].H(2)O}(n), each Mn(II) ion is seven-coordinated by four O atoms from two croconate ligands, two N atoms from a 2,2'-bipyridine (2,2'-bipy) ligand and one O atom from an aqua ligand. The croconate ligand bridges the Mn(II) ions in a bis-bidentate chelation mode, forming an extended [Mn(C(5)O(5))](n) chain running parallel to the [001] direction, with the lipophilic 2,2'-bipy ligands lying along one side and the hydrophilic water molecules along the opposite side. Coordinated water and solvent water molecules are arranged in the hydrophilic layer, which is characterized by O-H...O hydrogen bonds between croconate ligands. Meanwhile, 2,2'-bipy ligands from adjacent chains partially overlap and exhibit pi-pi interactions to form a lipophilic layer. The hydrophilic and lipophilic layers are arranged alternately to build a layer structure.
    Acta Crystallographica Section C Crystal Structure Communications 04/2010; 66(Pt 4):m97-100. · 0.78 Impact Factor
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    ABSTRACT: In the title one-dimensional coordination polymer, {[Mn(C5O5)(C10H8N2)(H2O)]·H2O}n, each MnII ion is seven-coordinated by four O atoms from two croconate ligands, two N atoms from a 2,2′-bipyridine (2,2′-bipy) ligand and one O atom from an aqua ligand. The croconate ligand bridges the MnII ions in a bis-bidentate chelation mode, forming an extended [Mn(C5O5)]n chain running parallel to the [001] direction, with the lipophilic 2,2′-bipy ligands lying along one side and the hydrophilic water molecules along the opposite side. Coordinated water and solvent water molecules are arranged in the hydrophilic layer, which is characterized by O—H...O hydrogen bonds between croconate ligands. Meanwhile, 2,2′-bipy ligands from adjacent chains partially overlap and exhibit π–π interactions to form a lipophilic layer. The hydrophilic and lipophilic layers are arranged alternately to build a layer structure.
    Acta Crystallographica Section C Crystal Structure Communications 01/2010; 66(4). · 0.78 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 01/2010; 30(49).
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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 01/2010; 86(1):63-67. · 3.53 Impact Factor
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    ABSTRACT: A new molecular conductor (n-Bu4N)[Ni(dmit)2]4·MeCN (dmit=2-thioxo-1,3-dithiole-4,5-dithiolato) has been synthesized and its X-ray structure has been determined. The crystal exhibits conductivity 0.1Ω−1cm−1 at room temperature and a semi-conducting behavior with small activation energy of 0.170eV (at 295K) and 0.065eV (at 95K). The coordination anions are arranged in a parallel fashion in the crystal forming two-dimensional networks, in which the face-to-face π–π longitudinal intermolecular interactions are stronger than the side-by-side S⋯S transverse interactions. The anionic stacks along the b-direction exhibit a type of tetrad structure. Infrared spectra suggest that the tetrad {4[Ni(dmit)2]}− may consist of one mono-anion [Ni(dmit)2]− and three neutral [Ni(dmit)2] units. The bond analysis further suggests that the single electron in the HOMO of [Ni(dmit)2]− can delocalize to its two neighboring [Ni(dmit)2] molecules to some extent.
    Inorganic Chemistry Communications - INORG CHEM COMMUN. 01/2010; 13(4):518-521.
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    Mao-Sen Yuan, Qi Fang
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    ABSTRACT: In the title mol-ecule, C(24)H(26)N(2)O(2), the two indol-2-one units, which are connected by a C=C double bond, are almost coplanar with an inter-planar angle of 6.8 (1)°. On cooling from 293 to 120 K, the space group changes from P2(1)/n to P2(1). Two intra-molecular C-H⋯O hydrogen bonds occur.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 67(Pt 1):o52. · 0.35 Impact Factor

Publication Stats

373 Citations
152.25 Total Impact Points

Institutions

  • 1998–2014
    • Shandong University
      • • State Key Laboratory for Crystal Materials
      • • Institute for Crystal Materials
      Chi-nan-shih, Shandong Sheng, China
  • 2003–2012
    • University of Jinan (Jinan, China)
      Chi-nan-shih, Shandong Sheng, China
  • 2002
    • Shandong Normal University
      Chi-nan-shih, Shandong Sheng, China