Pengfei Yan

Heilongjiang University, Charbin, Heilongjiang Sheng, China

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Publications (30)73.93 Total impact

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    ABSTRACT: A series of pyrazine-2,3,5,6-tetracarboxylate alkali-lanthanide coordination frameworks, namely [NaLn(pztc)(H2O)3]·H2O [Ln = Ce (), Sm (), Eu (), Gd () and Tb (); H4pztc = pyrazine-2,3,5,6-tetracarboxylic acid], have been synthesized by reacting Ln(NO3)3·6H2O with H4pztc in the presence of NaOH at room temperature. X-ray crystallographic analysis reveals that complexes are isostructural, featuring three-dimensional (3D) networks with a unique (4(11)·6(8)·8(2))(4(3)·6(2)·8)(4(3)) topology in which the ligand displays a novel μ7-coordination mode. The photoluminescence (PL) spectra in the solid state reveal that complexes , and exhibit the characteristic luminescence of Sm(iii), Eu(iii) and Tb(iii) ions, respectively, while complex displays a broad band in the range of 400-650 nm (λmax = 505 nm) which exhibits about 103 nm red-shift and enhancement compared to the band of the free ligand. Further, the isostructural two-component Eu(iii)-doped Gd(iii) complexes realize color-tunable luminescence from red to yellow, white, green and blue by the variation of excitation wavelengths. They represent the first example of full-color-tunable emission in lanthanide coordination frameworks by the variation of excitation light.
    Dalton transactions (Cambridge, England : 2003). 07/2014;
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    ABSTRACT: Three chloride-bridged lanthanide compounds, [Ln4Cl6(CH3OH)12(OH)2]·4Cl·2CH3OH [Ln = Gd (), Dy () and Er ()], have been unexpectedly isolated by the reactions of LnCl3·6H2O and N,N'-bis(salicylidene)-1,2-(phenylene-diamine) (H2L). X-ray crystallographic analysis reveals a triclinic cell with a unique defect-dicubane {Ln4} core and the structure across this series is nominally isomorphic. Measurements of direct current magnetic susceptibility and isothermal magnetization give insight into the relevant cluster Hamiltonians for , , and , and alternating current susceptibility shows slow relaxation in , but not in or down to 2 K and up to 1 kHz.
    Dalton transactions (Cambridge, England : 2003). 06/2014;
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    ABSTRACT: A novel bis-β-diketone ligand, 4,4'-bis(4,4,4-trifluoro-1,3-dioxobutyl)(phenoxy)-1,1'-binaphthalene (BTPB), is designed for synthesis of a white light emissive lanthanide complex. The ligand bears two benzoyl β-diketonate sites linked by a 1,1'-binaphthoxy spacer. Reaction of the doubly negatively charged bis-bidentate ligand with lanthanide ions forms triple-stranded dinuclear complexes Sm2(BTPB)3(H2O)4 () and Gd2(BTPB)3(H2O)4 (), which have been fully characterized by various spectroscopic techniques. UV-Vis absorption and emission spectroscopic techniques are used to investigate photophysical properties of the ligand and its complexes in THF and CHCl3. In some cases aggregation of the ligand results in the appearance of a new luminescence band at about 510 nm in addition to the monomer fluorescence. In complex , partial energy transfer from BTPB results in Sm(iii)-based red light emission in addition to the BTPB-based blue/green emission. With the variation of the excited wavelength and concentration of the solution, complex shows a tunable white light emission with the balance of three primary colors. This is an unusual case of observation of white light emission from a single molecule Sm(iii) complex.
    Dalton transactions (Cambridge, England : 2003). 05/2014;
  • Journal of Luminescence 02/2014; · 2.14 Impact Factor
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    ABSTRACT: A series of short-conjugated zwitterionic cyanopyridinium chromophores were synthesized through a simple and versatile synthetic method. The charge-separated ground state of the zwitterions was confirmed by X-ray crystallography. Negative solvatochromism, fluorescence properties and nonlinear optical property of the new zwitterions were investigated.
    Dyes and Pigments 01/2014; 111:145–155. · 3.53 Impact Factor
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    ABSTRACT: Five N,N′-bis(salicylidene)-1,2-cyclohexanediamine (H2L) lanthanide coordination polymers featuring unique 1D liner and 1D spiral chain structures exhibit SHG active, NIR luminescence and red emission.
    Synthetic Metals 01/2014; 192:29–36. · 2.11 Impact Factor
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    ABSTRACT: Graphical abstract Two 7,7,8,8-tetracyanoquinodimethane (TCNQ) Pb2+ and Zn2+ complexes featuring unique 3D and 0D structure have been isolated and structurally determined.
    Inorganica Chimica Acta. 01/2014; 413:32–37.
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    ABSTRACT: Two discrete salen type homo-multinuclear Yb3 and Yb4 complexes, namely, [Yb3L3(OAc)3]·3CH3OH·H2O (1) and [Yb4L2(OAc)4(μ3-OH)2(H2O)2](ZnCl4)·3CH3OH (2) (H2L = N,N′-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine) have been synthesized by reactions of H2L and different ytterbium salts. X-ray crystallographic analysis reveals that complex 1 exhibits a triple-decker Yb3 sandwich structure with a ratio of H2L:Yb = 1:1, while complex 2 exhibits a defect-dicubane Yb4 core with a ratio of H2L:Yb = 1:2. The NIR luminescence of complexes 1 and 2 have been investigated and discussed.
    Journal of Inorganic and Organometallic Polymers and Materials 01/2014; · 1.17 Impact Factor
  • Ye Tao, Pengfei Yan, Cheng Wang, Guangming Li
    Journal of Materials Science 10/2013; 48(19):6682-6688. · 2.16 Impact Factor
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    ABSTRACT: A series of five N,N'-bis(2-hydroxy-3-methoxybenzylidene)-1,3-propanediamine (H2L) ytterbium complexes, namely, [Yb(H2L)2(CH3OH)](ClO4)3 (), [Yb(H2L)(NO3)3]2·CH2Cl2 (), [Yb(H2L)2(NO3)]2(PF6)4·4H2O·2CH2Cl2 (), [Yb(H2L)(OAc)2]2(PF6)2·4CH2Cl2 () and [Yb3L'3(OH)2Cl(H2O)5]Cl3·4H2O () (HL' = 2-hydroxy-3-methoxybenzaldehyde), have been synthesized by reactions of H2L with multifarious Yb(iii) salts. X-ray diffraction analysis reveals that complex shows a unique mononuclear structure constructed from two chelating H2L ligands in crossover mode. Complex exhibits a dinuclear structure bridged by two H2L ligands. Complexes and possess two novel dinuclear structures linked by NO3(-) and OAc(-) anions, respectively. Complex displays a trinuclear structure supported by three L' and two OH(-) anions. Noticeable, complex can be transformed from by introducing (NH4)(PF6). The PF6(-) counterion plays an essential role in steering the structural transformation. The anions dominate the final structures of . All complexes exhibit NIR luminescence, which can be rationalized on the basis of different structural effects. Preliminary catalytic studies reveal that all complexes are able to catalyze effectively a typical Henry reaction with good yields.
    Dalton Transactions 07/2013; · 3.81 Impact Factor
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    ABSTRACT: A new β-diketone, 5,6-dimethoxy-2(2,2,2-trifluoroethyl)-1-indone (5,6-DTFI), has been designed and synthesized. Two series of four 5,6-DTFI Sm(3+) and Eu(3+) complexes, namely, Eu(5,6-DTFI)3(H2O)2 (), Eu(5,6-DTFI)3(Phen) (), Sm(5,6-DTFI)3(H2O)2 () and Sm(5,6-DTFI)3(Phen) () (Phen = 1,10-phenanthroline), have been isolated. X-ray diffraction analysis reveals that all complexes are of mononuclear structures. Luminescent and phosphorescent spectra of complexes show strong characteristic emissions of the corresponding Eu(3+) and Sm(3+) ions. Upon complexes and were doped into the poly(methylmethacrylate) (PMMA) forming the films, the PMMA polymer matrix acting as a co-sensitizer for Eu(3+) ion enhances the luminescent lifetimes, overall quantum yields and the thermal stability in comparison with the precursor complexes.
    Dalton Transactions 07/2013; · 3.81 Impact Factor
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    ABSTRACT: Two new hybrid compounds with tetragonal and dodecagonal helical channels, K[Ag14 (pyttz)4 (H2 O)2 ][PW12 O40 ]2 ⋅(OH)⋅5 H2 O (1) and K[Ag14 (pyttz)4 (H2 O)4 ][HSiW12 O40 ]2 ⋅H2 O (2), have been hydrothermally synthesized and structurally characterized by using routine techniques. X-ray diffraction analysis shows that compounds 1 and 2 are isostructural and crystallize in the monoclinic space group P21 /c. A fascinating structural feature of these compounds is that they form 3D POM-Ag frameworks with helical channels, which are the first examples of helical channels that are constructed from POMs and metal atoms. Notably, there are two types of spatial orientation of the POMs, which result in the formations of left- and right-handed helical chains. Furthermore, these different helical chains are perfectly enclosed through shared POMs, thereby forming tetragonal and dodecagonal helical channels. In addition, the photocatalytic degradation of RhB by these compounds was also investigated.
    Chemistry - An Asian Journal 06/2013; · 4.57 Impact Factor
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    ABSTRACT: Three dinuclear lanthanide complexes are achieved by using H2salen or H2salen / acac ligands (H2salen = N,N'-ethylenebis(salicylideneimine), acac = acetylacetone). They are homodinuclear [Er2(salen)3] (1), [Yb2(salen)2(acac)2] (2), heterodinuclear geometrical [ErYb(salen)2(acac)2] (3). The complexes structure were determined by single ctystal X-ray crystallographic studies and their photophysical properties were investigated. The homonuclear Yb2 complex exhibits characteristic metal-centered NIR emission. The geometric ErYb isomer exhibits ‘dual emissions’ from both erbium(III) and ytterbium(III) ions. There was no detectable photoluminescence in Er2 complex not only in solid state but also in solvent.
    CrystEngComm 05/2013; · 3.88 Impact Factor
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    ABSTRACT: Two types of N,N'-bis(salicylidene)-1,3-propanediamine (H2L) lanthanide complexes, viz. [Ln(NO3)3(H2L)2]·0.2CH3OH [Ln = La (), Ce () and Pr ()] and [Ln(NO3)3(H2L)2]2·CH2Cl2·CH3OH [Ln = Nd (), Sm (), Eu (), Gd (), Tb () and Yb ()], have been isolated by reactions of H2L with Ln(NO3)3·6H2O. X-ray crystallographic and PXRD analysis reveal that are isomorphic possessing a novel one-dimensional (1D) ladder-like double-chain structure. Complexes are isostructural exhibiting a discrete dinuclear structure. Luminescent analysis reveals the lanthanide ion and ligand-centered co-luminescence for , and , which are attributed to the incomplete energy transfer from the triplet state of H2L to the resonance energy level of the corresponding Ln(iii) ion. Further, the characteristic near infrared (NIR) luminescence of Nd(iii) and Yb(iii) ions for complexes and have been revealed.
    Dalton Transactions 05/2013; · 3.81 Impact Factor
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    ABSTRACT: A series of five new salen type cerium complexes, namely [Ce(H2L)2CH3OH](PF6)3·2H2O·CH2Cl2 (1), [Ce(IV)L2] (2), [Ce(H2L)(NO3)3CH3OH] (3), [Ce2(H2L)3(NO3)6]·4H2O (4) and {[Ce(H2L)2(NO3)2](PF6)·2CH3CN}n (5) (H2L = N,N′-bis(3-methoxysalicylidene)cyclohexane-1,2-diamine), have been isolated by reactions of H2L with various cerium salts and/or NH4PF6. All complexes 1–5 have been fully characterized by elemental analysis, FT-IR spectroscopy, UV spectroscopy, powder X-ray diffraction, TG–DSC analysis, and single-crystal X-ray diffraction. X-ray crystallographical analysis reveals that complexes 1–3 are of discrete mononuclear structures, 4 is of a discrete binuclear structure, and complex 5 is of a unique quartz 3D topological structure. The electrochemical behavior of this series of salen type cerium complexes has been examined by cyclic voltammetry in acetonitrile. Cyclic voltammograms of complexes 1 and 3–5 show two quasi-reversible redox processes within the electrochemical window of acetonitrile.
    CrystEngComm 04/2013; 15(20):4167-4175. · 3.88 Impact Factor
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    ABSTRACT: Three new 7,7,8,8-tetracyanoquinodimethane (TCNQ) alkaline-earth metal complexes, namely {[M2(TCNQ)3(H2O)6]·TCNQ}n (M = Ca (), Sr () and Ba ()) have been synthesized by salt elimination reactions. X-ray crystallographic analysis reveals that complexes , and are isomorphic featuring a unique 3D structure. Cyclic and differential pulse voltammograms for complexes show a reversible one-electron oxidation and a reversible one-electron reduction within the electrochemical window of CH3CN. Their electrochemical HOMO-LUMO gap and reversibility are examined.
    Dalton Transactions 04/2013; · 3.81 Impact Factor
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    ABSTRACT: Six phenoxo-bridged tetradentate salophen heterotrinuclear Zn2Ln complexes, [Ln(ZnL)2(NO3)3(CH3OH)2]·CH3OH·CH2Cl2 [Ln = Pr (1), Nd (2)] and [Ln(ZnL)2(NO3)3(CH3OH)]·CH3OH·CH2Cl2 [Ln = Eu (3), Ho (4), Er (5), and Yb (6)], have been isolated from reactions of N,N′-bis(salicylidene)-1,2-(phenylene-diamine) with Ln(NO3)36H2O and Zn(OAc)22H2O. X-ray diffraction analysis reveals that 1–6 are isomorphic with phenoxo-bridged, sandwich-like {Zn2Ln} core. Near infrared (NIR) luminescence spectra show that 6 exhibits typical emission of Yb3+ upon excitation at the ligand-centered absorption band at 357 nm.
    Journal of Coordination Chemistry 01/2013; 66(6). · 1.80 Impact Factor
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    ABSTRACT: A novel coordination polymer [Cd(4-tzbc)2]n (1) [H(4-tzbc) = 4-(1H-1,2,4-triazol-1-ylmethyl)benzoic acid] has been isolated by direct combination of unsymmetrical semi-rigid 4-tzbc with cadmium nitrate by the solvothermal method. Single-crystal X-ray diffraction study reveals that complex 1 exhibits a novel 3D rutile type framework with 1D channel. Thermal analysis suggests that 1 is of high thermostability at 345 °C. The photoluminescence of complex 1 reveals a cadmium ion disturbed ligand emission.
    Synthetic Metals 12/2012; 162(s 21–22):1894–1897. · 2.11 Impact Factor
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    ABSTRACT: A new β-diketone, 2-(2,2,2-trifluoroethyl)-1-indone (TFI), which contains a trifluorinated alkyl group and a rigid indone group, has been designed and employed for the synthesis of two series of new TFI lanthanide complexes with a general formula [Ln(TFI)(3)L] [Ln = Eu, L = (H(2)O)(2) (1), bpy (2), and phen (3); Ln = Sm, L = (H(2)O)(2) (4), bpy (5), and phen (6); bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline]. X-ray crystallographic analysis reveals that complexes 1-6 are mononuclear, with the central Ln(3+) ion eight-coordinated by six oxygen atoms furnished by three TFI ligands and two O/N atoms from ancillary ligand(s). The room-temperature photoluminescence (PL) spectra of complexes 1-6 show strong characteristic emissions of the corresponding Eu(3+) and Sm(3+) ions, and the substitution of the solvent molecules by bidentate nitrogen ligands essentially enhances the luminescence quantum yields and lifetimes of the complexes.
    Inorganic Chemistry 04/2012; 51(9):5050-7. · 4.59 Impact Factor
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    ABSTRACT: Three types of phenolateoxygen-bridged N,N′-bis(2-oxy-3-methoxybenzylidene)-1,2-diaminophenylene 3d–4f heteronuclear and 4f tetranuclear complexes, namely, [(LZnCl)PrCl2(CH3OH)2]2 (1), [(LZnCl)LnCl(OAc)(CH3OH)] (Ln = Tb (2) and Dy (3)) and [{(LLu2)(OAc)2(H2O)(OH)}2(ZnCl4)]·2H2O (4) are obtained by reactions of H2L (H2L = N,N′-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine), LnCl3·6H2O (Ln = Pr, Tb, Dy and Lu) and Zn(OAc)2·2H2O in CH3OH/CH2Cl2. X-Ray crystallographic analysis reveals that complex 4 possesses a novel defect-dicubane core, where four Lu3+ ions are inserted into the two sets of N2O2 and O2O2 cavities among the two tail-to-tail ligands. The structural investigations unambiguously testify that the lanthanide contraction and the rigid ligand cooperatively affect the formation of complexes 1–4, where Ln3+ ions with large, medium and small radius are composed in three different structures. The fluorescent spectrum of complex 2 exhibits the characteristic metal-centred fluorescence of Tb3+ ions.
    CrystEngComm 09/2011; 13(20):6237-6242. · 3.88 Impact Factor