Zhe-Jun Lu

Publications (4)11.23 Total impact

• Article: Diamino-diamido tetrathiafulvalene for the sensing of anions and cations: a view in electrochemistry and structure.

  Zheng Shi, Zhe-Jun Lu, Qin-Yu Zhu, Li-Bin Huo, Qiong-Hua Han, Guo-Qing Bian, Jie Dai
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  ABSTRACT: A new cation- and anion-sensitive system based on a TTF derivative with a diamino-diamido moiety (H(2)L) has been studied. The results of cyclic voltammetry indicated that the redox potentials of the protonated H(2)L (H(4)L(2+)) selectively respond to later transition metal cations and some oxo anions. Solid-state structures of the cation-anion compounds formed by H(4)L(2+) and oxo anions were characterized crystallographically, which is helpful to understand the matter of the sensitivity for the anion. There are two types of hydrogen bonds in these compounds, one is with an amino group and the other is with an amido group. The shift of the redox potential is obviously related to formation of hydrogen bonding with the amido group. The packing structures of these cation-anion compounds are arranged to layered sandwiched structures assembled by an oxo-anion layer and two TTF layers through hydrogen bonding.
  The Journal of Physical Chemistry B 03/2011; 115(12):3020-6. · 3.70 Impact Factor
• Article: Calcium and Magnesium Bicarboxylates Combined with Tetrathiafulvalene Moiety

  Jin-Po Wang, Zhe-Jun Lu, Qin-Yu Zhu, Ya-Ping Zhang, Yu-Rong Qin, Guo-Qing Bian, Jie Dai
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  ABSTRACT: Four coordination compounds of calcium and magnesium with tetrathiafulvalene (TTF) bicarboxylate ligand have been synthesized and characterized by single-crystal analysis. As well-studied bicarboxylate complexes, the carboxylate groups in this ligand coordinate to alkaline earth metal ions in multidentate modes forming compounds 1−4. Calcium compounds [CaL(DMF)2] (1) and [Ca2L2(H2O)2(EtOH)]·MeOH (2) take a seven-coordinated sphere with a pentagonal bipyramid geometry, while magnesium compounds [Mg2L2(H2O)7]·EtOH·4H2O (3) and [Na2(DMF)2(H2O)9][MgL2(DMF)2] (4) are six-coordinated with an elongated octahedral geometry. The effect of metal ion radii on the coordination structure is clearly exhibited. The molecules of these alkaline-earth metal complexes are assembled to a sandwiched structure with hydrophobic layers of a sulfur-rich TTF matrix and hydrophilic layer of the metal carboxylate. Equilibriums of the metal coordination, acid dissociation, and ligand oxidation have been studied in the solution systems of these compounds. At a neutral state of the TTF moiety, TTF-carboxylate is an appropriate ligand for Ca(II) ion, but when the TTF moiety is oxidized, it switches the alkaline earth metal ion to the solution.
  03/2010;
• Article: Cu(II) and Ni(II) dioxotetraamine complexes integrated with tetrathiafulvalene moiety; structures and solution chemistry.

  Zhe-Jun Lu, Jin-Po Wang, Qin-Yu Zhu, Li-Bin Huo, Yu-Rong Qin, Jie Dai
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  ABSTRACT: A new bifunctional tetrathiafulvalene (TTF) derivative has been designed and synthesized, in which the TTF moiety (a redox functional group) is integrated with a dioxotetraamine (a coordination functional group) structure. Like other dioxotetraamine compounds, it is capable of acting as an ion leaving and accepting ligand for protons and Cu(II) and Ni(II) ions in solution. Experiments of pH titration have shown that the TTF unit adds new redox properties to the traditional ligand. Oxidation of the ligand increases the acidity of the imido group and the coordination of metal ions is also sensitive to the oxidation state of the ligand. The ligand forms either a square coordinated Ni(II) complex with two deprotonated imido groups and two amino groups, or a pentacoordinated Cu(II) complex with an additional solvent molecule. The compounds form a belt structure with strong N-H...O hydrogen bonds, which is a basic character for this type of compound in the crystalline form.
  Dalton Transactions 03/2010; 39(11):2798-803. · 3.84 Impact Factor
• Article: Triadic intramolecular charge transfer compound of tetrathiafulvalene exhibiting multicolor solvatochromism.

  Qin-Yu Zhu, Li-Bin Huo, Yu-Rong Qin, Ya-Ping Zhang, Zhe-Jun Lu, Jin-Po Wang, Jie Dai
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  ABSTRACT: An A-D-A triad compound comprising a tetrathiafulvalene (TTF) moiety and two pyridyl groups, py-TTF-py (1), has been studied in view of intramolecular charge transfer (ICT). The compound shows a sharp and multicolor change in different solvents and at different pH values, exhibiting good solvatochromism. The results of electronic absorption spectroscopy, cyclic voltammetry, and theoretical calculations confirm that there exists predominantly a monoprotonated A-D-A triad that displays a strong ICT effect, which is tunable as a function of pH. The equilibrium of protonation of 1 has been further studied by means of pH titration, and the result confidently supports the conclusion that only one equivalent H(+) combines with py-TTF-py in dilute solution, even when excessive acid is added. However, unlike the state in dilute solution, the crystal structure of the protonated 1 is a diprotonated A-D-A triad, (1.2H(+)).(CF(3)SO(3)(-))(2).H(2)O (2), that has been structurally characterized.
  The Journal of Physical Chemistry B 12/2009; 114(1):361-7. · 3.70 Impact Factor