Peng Zhao

Sangmyung University, Seoul, Seoul, South Korea

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Publications (10)11.17 Total impact

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    ABSTRACT: Novel phthalocyanine sulfonate (H2PPcSx) was synthesized from the sulfonation of a steric polymeric phthalocyanine and investigated as a photocatalyst in a homogenous system. The molecular weight of H2PPcSx was characterized as 9213ā€“11692 by MALDI-TOF MS, classified as an oligomer with a 14ā€“18 degree of polymerization. The electronic spectrum indicated a less aggregative tendency of H2PPCSx than the usual monomeric phthalocyanine photocatalyst. Efficient photodegradation of butyl Rhodamine B (bu Rh B) catalyzed by H2PPcSx was achieved in a homogenous solution; the spectral character indicated that decomposition occurred on the benzene ring in the Rh B molecular. For a 50 mg Lāˆ’1 bu Rh B solution, the percentage degradation reached 95% in 4 h using 100 mg H2PPcSx as a photocatalyst. A mechanism involving the participation of both singlet oxygen and radicals was established for the photodegradation. Keywordspolyphthalocyanine-photocatalysis-homogenous catalysis-Rhodamine-singlet oxygen
    Macromolecular Research 01/2010; 18(5):496-503. · 1.64 Impact Factor
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    ABSTRACT: Two novel steric polymeric phthalocyanines, with copper (CuPPc) and aluminum hybrid zinc (Al/ZnPPc) as the central atoms, were synthesized by the cyclic condensation of tetrahedral tetra-phthalonitriles. The IR and UV-VIS spectra of the synthesized polymers indicated a moderate degree of polymerization, somewhere between the monomeric phthalocyanine and planar covalent polymer. Good thermal stability and a high metallic content of CuPPc and Al/ZnPPc were verified by TGA and ICA-AAS methods. The metallic atoms were distributed uniformly and exhibited different binding features with -CN, -O, -N in the polymer, as indicated by EDS and XPS analysis. High electrical conductivity was observed before and after iodine doping compared to the normal polymeric phthalocyanine.
    Macromolecular Research 01/2010; 18(2):113-119. · 1.64 Impact Factor
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    ABSTRACT: The synthesis and photochemical properties are reported for a series of novel amphiphilic carboxyl polymeric phthalocyanines, with zinc (3a), aluminum (3b), ytterbium (3c) and hydrogen (metal-free, 3d) as the substituted central atom, respectively. The synthesis routes included cyclotetramerization of tetra-phthalonitriles and subsequent hydrolysis of cyano to carboxyl in alkaline solution. All four molecules were verified to be oligomers by viscosity method. Specifically, 3c showed strongest fluorescent emission, which can be elevated by Triton X 100 and CTAB. The singlet oxygen quantum yield (Phi(Delta)) for 3a and 3b were larger than that of 3c and 3d. In the presence of surfactants, nearly 2 folds enhancement of Phi(Delta) was observed as 0.76 and 0.70 for 3a and 3b, respectively. The characteristic photochemical properties of these oligomers suggested potential applications in photodynamic therapy, photocatalysis and photodynamic diagnoses.
    Dalton Transactions 09/2009; · 3.81 Impact Factor
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    ABSTRACT: Two kinds of novel phthalocyanines: tetra-azobenzene substituted phthalocyanine (metal free and with zinc as centric atom) and novel polymeric phthalocyanine carboxyl based on pentaerythritol framework (with ytterbium and aluminum as centric atoms) have been synthesized and their electronic adsorption and emission spectrum haven been investigated in water solution and organic solvent. Both synthesized compounds can emit two fluorescence peaks when excited at low wavelength (below 400nm) and one emission peak when excited at long wavelength (higher than 600 nm). For polymeric aluminum phthalocyanine carboxyl, in pH7.4 buffer solution, when excited at 330nm, beside normal fluorescence peak at 720nm, a second emission peak appears at 455nm. The emission at 720 nm can be intensified by addition of hexadecyl trimethyl ammonium bromide (CTAB) while the peak at 455nm does not. The fluorescence quantum yield of two emission peaks is 0.35 (720nm em, 635nm ex) and 0.33 (455nm em, 330nm ex), respectively. This equivalent multi-emission phenomenon by different excited wavelength indicates well applied potential in dual-wavelength photodynamic diagnose and fluorescence imagination.
    Proc SPIE 12/2008;
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    ABSTRACT: The photosensitizing properties of a novel phthalocyanine analogue, sulfonated dihydroxy phosphorus(V) tetrabenzotriazacorrole [P(OH)2TBCSn] and a non-sulfonated one [P(OH)2TBC] are reported in this paper. Different from other phthalocyanine derivatives, P(OH)2TBCSn shows little aggregation in aqueous solution. The fluorescence quantum yield (PhiF) of P(OH)2TBCSn is lower than that of the non-sulfonated one. Studies of triplet state photophysics show that the presence of peripheral substituents on the macrocycle enhances the quantum yield of the triplet state. The sulfonated derivative, P(OH)2TBCSn, has a longer triplet lifetime (tauT = 0.234 ms) and higher singlet oxygen quantum yield (PhiDelta = 0.88) than P(OH)2TBC. Together with the ground-state absorption properties, the photosensitizing properties of the new compound suggest that it may be used as an excellent photosensitizer for photodynamic therapy (PDT).
    The Journal of Physical Chemistry A 06/2008; 112(18):4165-9. · 2.77 Impact Factor
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    ABSTRACT: A water soluble poly-[tetrakis-(2,3-dicarboxylate phenoxy) methyl methan] aluminum phthalocyanine (AIPPc.(COOH) x ) has been synthesized from the cyclization of tetranuclear phthalonitrile and successive hydrolysis of cyano in alkaline solution. The absorption spectra showed low aggregation of this compound in pH 9.18 buffer than that of existing water soluble phthalocyanine compounds. With the addition of Triton X 100, an enhancement of fluorescence emission with quantum yield from 0.4 to 0.83 was observed; contrarily, it was thoroughly quenched by the addition of CATB in suit. A longer life time of singlet state was also detected in presence of Triton X 100. The result indicates that AIPPc.(COOH) x is desired to investigate in fluorescent probe or in fluorescence imaging diagnose.
    Chinese Science Bulletin 01/2008; 53(20):3159-3163. · 1.32 Impact Factor
  • Journal of The Electrochemical Society - J ELECTROCHEM SOC. 01/2008; 155(10).
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    ABSTRACT: Dibenzo [1,4,8,11] tetraaza [14] annulene nickel (TAA-Ni) has been synthesized and its inhibitive behavior on mild steel in 1M HCl was firstly investigated by gravimetric, potentiodynamic and impedance method. The potentiodynamic curves indicate the TAA-Ni mainly acted as mixed type inhibitor on electrochemistry in acid media. The weight loss result indicates TAA-Ni is good inhibitor in acid solution with the temperature changing from 303K to 333K. The XPS experiment indicates the protonation of TAA-Ni and its chemical adsorption on steel surface.
    Corrosion Science - CORROS SCI. 01/2008; 50(8):2166-2171.
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    ABSTRACT: Three ytterbium phthalocyanine compounds, ytterbium bis- phthalocyanine (Yb(Pc)2), ytterbium bis- [(tetrakis- (tertiary-pentyloxy) phthalocyanine)] [Yb(Pc(t-OR5)4)2], bis-ytterbium tris- [(tetrakis- (tertiary-pentyloxy) phthalocyanine)] [Yb2(Pc(t-OR5)4)3] have been synthesized and characterized by electronic spectrum, MS and element analysis. The Uv-vis spectrum indicated lower aggregation trend and red shift of Q bands with phthalocyanine ring increasing from dimer to trimer. The nonlinear optical properties of these compounds in THF solution were investigated by Z-scan method used 532 nm picosecond laser under open and close aperture condition. Both compounds showed reverse saturation absorption and nonlinear self-focus refraction effect. The nonlinear absorption and refraction capacity decreased with the order: Yb2(Pc(t-OR5)4)3 >Yb(Pc(t-OR5)4)2> Yb(Pc)2.
    Proc SPIE 01/2008;
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    ABSTRACT: Photodynamic diagnosis (PDD) is of increasing interest for diagnosis in oncology. It is based on the selective accumulation of photosensitizers in tumours, such as porphyrin and phthalocyanine. In the present study, novel dihydroxy phosphorus tetrabenzotriazacorrole derivates have been synthesized. And photophysical properties of these derivates have been studied. Dihydroxy phosphorus tetrabenzotriazacorrole derivates display a fluorescence which is from the higher S2 electronic state. With excitation at 614 nm, the fluorescence maximum is at 668 nm for dihydroxy phosphorus(V)-2,9,16,23-tetranitrotetrabenzotriazacorrole {P(OH)2TBC(NO2)4} in N,N-dimethylformamide (DMF). But with excitation at 310 nm for P(OH)2TBC(NO2)4 in DMF, in addition to S1 fluorescence a new fluorescence peak appears at 490 nm, which is attributed to S2-state fluorescence. It indicates that the dihydroxy phosphorus tetrabenzotriazacorrole derivates might have a potential application as a dual fluorescent marker for photodynamic diagnosis.
    Proc SPIE 10/2007;

Publication Stats

10 Citations
11.17 Total Impact Points

Institutions

  • 2010
    • Sangmyung University
      • Department of Industrial Chemistry
      Seoul, Seoul, South Korea
  • 2009
    • Tsinghua University
      • Department of Chemistry
      Beijing, Beijing Shi, China