Institute of Molecular Science

Taiyuan, China

Institute of Molecular Science

Taiyuan, China

Time filter

Source Type

Mineo H.,National Taiwan University | Yamaki M.,Institute of Molecular Science | Teranishi Y.,National Chiao Tung University | Hayashi M.,National Taiwan University | And 5 more authors.
Journal of the American Chemical Society | Year: 2012

Nonplanar chiral aromatic molecules are candidates for use as building blocks of multidimensional switching devices because the π electrons can generate ring currents with a variety of directions. We employed (P)-2,2′-biphenol because four patterns of π-electron rotations along the two phenol rings are possible and theoretically determine how quantum switching of the π-electron rotations can be realized. We found that each rotational pattern can be driven by a coherent excitation of two electronic states under two conditions: one is the symmetry of the electronic states and the other is their relative phase. On the basis of the results of quantum dynamics simulations, we propose a quantum control method for sequential switching among the four rotational patterns that can be performed by using ultrashort overlapped pump and dump pulses with properly selected relative phases and photon polarization directions. The results serve as a theoretical basis for the design of confined ultrafast switching of ring currents of nonplanar molecules and further current-induced magnetic fluxes of more sophisticated systems. © 2012 American Chemical Society.


Wu Y.-C.,Institute of Molecular Science | Wang D.-Y.,Institute of Molecular Science | Chen T.-M.,Institute of Molecular Science | Lee C.-S.,Institute of Molecular Science | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2011

A Ce3+-activated fluorosulfide phosphor (β-YFS:Ce 3+) was synthesized by solid-state reaction in a sealed tube. The crystal structure has been refined from the XRD profiles and there are two different crystallographic rare earth sites, namely, Y(1) and Y(2), where the Ce3+ ions occupied. The emission band with a maximum at 495 nm of β-Y0.99Ce0.01FS phosphor was characterized by the 4f-5d transitions of Ce3+ ion. With increasing Ce3+ concentration, the emission variations were observed from 495 to 547 nm. When β-YFS:Ce3+ phosphors were utilized to incorporate with n-UV/blue chip, greenish-white light with color rendering index of 65-77 were obtained. The results indicate that the tunable green- to yellow-emitting β-YFS:Ce3+ can serve as a potential phosphor for incorporation in fabrication for solid-state lighting. The preparation, spectroscopic characterization, quantum efficiency, thermal-quenching behavior, and related LED device data are also presented. © 2011 American Chemical Society.


Dey B.,Jadavpur University | Das A.,Jadavpur University | Choudhury S.R.,Jadavpur University | Jana A.D.,Sripat Singh College | And 3 more authors.
Inorganica Chimica Acta | Year: 2010

One hetero-bimetallic Cu(II)/Cd(II) compound, [CdII(H2O)2][CuII(mal)2(H2O)2]n (1) (H2mal = malonic acid) has been synthesized and characterized using single crystal X-ray crystallography, thermogravimetric (TG) studies and X-ray powder diffraction (XRPD) measurements. The compound crystallizes in orthorhombic Pbcn space group having cell dimensions a = 6.6260(12) Å, b = 13.958(2) Å and c = 13.052(2) Å. The solid state structure of compound 1 demonstrates a 3D pillared layered coordination network generated through the simultaneous bridging as well as chelating mode of malonate towards the Cd(II) and Cu(II), respectively. TG analysis reveals relatively high thermal stability for the compound (decomposition temperature ∼320 °C). The thermal study also reveals that the coordinated waters attached to both the metal centers (Cd(II) and Cu(II)) are reversibly lost and gained and this behavior is also corroborated by XRPD studies. © 2009 Elsevier B.V. All rights reserved.


Wang J.-L.,Changzhi Uniiersity | Jiao Y.,Institute of Molecular Science | Yang B.-S.,Institute of Molecular Science
Chinese Journal of Inorganic Chemistry | Year: 2014

An intriguing supramolecular complex NiL2(HL: (E)-4-methyl-N′-(pyridin-2-ylmethylene) benzenesul-fonohydrazide) with novel Ni-O (sulfonyl) coordination bond has been synthesized and characterized. The structural studies indicate that two types of dimers are assembled via intermolecular offset face-to-face π · · · π stacking (O) and edge-to-face C-H · · · π(EF) interactions between two pyridyl rings in the crystal structure of NiL2. Each dimer exists in two enantiomeric forms. The DFT calculation indicates that the parallel fourfold aryl embrace (P4AE) interactions, with one OFF interaction and two EF interactions, are stronger than that of only OFF, which can be called synergistic effects. The spectral studies show that the ratio of Ni(II) to HL is 1:2 in this compound.


Huo F.-J.,Shanxi University | Su J.,Institute of Molecular Science | Sun Y.-Q.,Shanxi University | Yin C.-X.,Institute of Molecular Science | And 2 more authors.
Dyes and Pigments | Year: 2010

The optical properties of a novel, rhodamine-based derivative, synthesized by reacting rhodamine hydrazide and 5-chlorosalicylaldehyde in ethanol, were investigated in methanol:HEPES solution. The novel sensor displayed selectivity for Cu 2+, as evidenced by a colourless to dark red colour change, which was characterized using UV-visible spectroscopy and which also allowed visual detection of Cu 2+. In contrast, selectivity towards VO 2+ was determined from changes in the emission spectra in the nanomolar range. This represents the first reported rhodamine-based sensor capable of detecting both Cu 2+ and VO 2+ using two different modes. Crown Copyright © 2009.


Zhou B.,Institute of Molecular Science | Wang Z.,Institute of Molecular Science | Tian Y.,Institute of Molecular Science | Yang B.,Institute of Molecular Science
Electrochimica Acta | Year: 2010

A new species was formed when protein P23 (one segment of ciliate Euplotes octocarinatus centrin) was added to a solution of Eu3+. The interaction between P23 and Eu3+ was investigated by cyclic voltammetry, pulse voltammetry and electrochemical impedance spectroscopy in 10 mM N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid (HEPES) buffer (pH 7.4) using a pyrolytic graphite electrode. The formal potential (Eo′) of Eu3+ shifted from -0.61 to -0.84 V (versus saturated calomel electrode) after P23 was added to the Eu3+ solution. The diffusion coefficient (D), the charge-transfer coefficient (α) and the electron transfer standard rate constant (ks) were obtained in the absence and the presence of P23. The affinity constant of Eu3+ and P23 was determined to be (1.89 ± 0.51) × 104 M-1. The electrochemical investigation of europium bound to the protein provided useful data for the studies of calcium-binding proteins. © 2010 Elsevier Ltd. All rights reserved.


Liu X.,Institute of Molecular Science | Li M.,Institute of Molecular Science | Han G.,Institute of Molecular Science | Dong J.,Institute of Molecular Science
Electrochimica Acta | Year: 2010

Polyacrylonitrile nanofibrous mats coated with continuous thin gold films (Au-PAN) have been fabricated by combining the electrospinning and electroless plating techniques. The Pt particles are electrodeposited on the Au-PAN fibers surface by multi-cycle CV method, and the Au-PAN decorated with Pt (Pt/Au-PAN) shows higher activity toward methanol electro-oxidation. The catalytic peak current for methanol oxidation on the optimum Pt/Au-PAN electrode can reach about 450 mA mg-1 Pt which is much larger than the catalytic peak current for methanol oxidation (118.4 mA mg-1 Pt) on the electrode prepared by loading commercial Pt/C on Au-PAN (Pt/C/Au-PAN). Further experiments reveal that the Pt/Au-PAN electrodes exhibit better stability and smaller charge transfer resistance than Pt/C/Au-PAN electrodes, which indicates that the Au-PAN may be developed as supporting material for catalyst. The microscopy images of the electrodes show that the Pt particles deposited on Au-PAN conglomerate into larger particles, and that the Pt/C catalyst loaded on the Au-PAN also exhibits conglomeration after stability test. The hydrogen adsorption-desorption experiments indicate that the electrochemical surface area of the Pt particles for the both kinds of electrodes has decreased after stability test. © 2010 Elsevier Ltd. All rights reserved.


Guo B.,Institute of Molecular Science | Han G.,Institute of Molecular Science | Li M.,Institute of Molecular Science | Zhao S.,Institute of Molecular Science
Thin Solid Films | Year: 2010

The ultrafine polymethylmethacrylate fibers containing gold nanoparticles have been prepared by using the electrospinning technique. Then the continuously coarse gold films formed by fractal-like thorny gold particles were deposited on the organic eletrospun fiber surface by an electroless process. The morphology of coarse gold films was characterized by scanning electron and transmission electron microscopy. The results revealed that the morphology of the gold particles was affected not only by the amount of gold seeds embedded in the organic fibers but also by the amount of gold deposited on the fiber's surfaces. The surface-enhanced Raman scattering (SERS) effect of the fibrous mats coated with gold films was evaluated by using Rhodamine B as an adsorbate. The results indicated that this kind of fibrous mat exhibited high and reproducible SERS activity and could be developed as highly sensitive SERS substrate. © 2009 Elsevier B.V. All rights reserved.


Lu L.,Institute of Molecular Science | Yue J.,Institute of Molecular Science | Yuan C.,Institute of Molecular Science | Zhu M.,Institute of Molecular Science | And 3 more authors.
Journal of Inorganic Biochemistry | Year: 2011

To investigate the structure-activity relationship of vanadium complexes in inhibiting protein tyrosine phosphatase1B (PTP1B), eight mixed-ligand oxovanadium(IV) complexes, [V IVO(SalAla)(NN)] (H 2SalAla for salicylidene alanine, NN for N,N′-donor heterocyclic base, namely, 2,2′-bipyridine (bpy, 1), 1,10-phenanthroline (phen, 2), dipyrido[3,2-d:2′,3′-f]quinoxaline (dpq, 3), dipyrido[3,2-a: 2′,3′-c]phenazine (dppz, 4)), [V IVO(SalLys)(dpq)] (5), [V IVO(SalLys)(dppz)] (6), [V IVO(SalAsp)(dppz)], (7) and [V IVO(SalTrp)(dppz)] (8)), of which 3-8 are new, have been prepared and characterized by elemental analysis, infrared, UV-visible, electrospray ionization mass spectrometry and conductivity. The molar conductance data confirmed the non-electrolytic nature of the complexes in DMSO solution. The coordination in [V IVO (SalAla)(phen)] (2) was confirmed by X-ray crystal structure analysis. The oxidation state of V(IV) with d 1 configuration in 2 was confirmed by EPR. The speciation of VO-SalAla-phen in aqueous solution was investigated by potentiometric pH titrations. The results indicate that the main species are two ternary complexes at the pH range 7.0-7.4. Biochemical assays demonstrate that the mixed-ligand oxovanadium(IV) complexes are potent inhibitors of PTP1B with IC 50 values in the range of 62-597 nM, approximately 3-10 fold weaker in potency than those of similar mixed-ligand oxovanadium(IV) complexes of salicylidene anthranilic acid (SAA) derivative with polypyridyl ligands, except complex 8, which exhibits comparable or better inhibition activity than those of the mixed-ligand oxovanadium(IV) complexes of SAA derivative with polypyridyl ligands. The results demonstrate that the structures of vanadium complexes influence the PTP1B inhibition activity. Kinetics assays reveal that complex 2 inhibits PTP1B in a competitive manner. © 2011 Elsevier Inc. All rights reserved.


Zhao S.,Institute of Molecular Science | Han G.,Institute of Molecular Science | Li M.,Institute of Molecular Science
Materials Chemistry and Physics | Year: 2010

The continuous copper films have been deposited on the surfaces of polyacrylonitrile fibers prepared by electrospinning process. Then the monoclinic-phase Cu2S thorny rods were obtained under the mixed gas of H2S and O2 by using the copper-coated fibrous mats as substrate. The silver could be deposited conveniently on the surface of copper-coated fibrous mats by using sacrificial method. When the silver-gilt copper-coated fibrous mats were used as substrates and treated under the same atmosphere, the monoclinic-phase Cu7S4 with bottle- and thorny rod-shape could be obtained. The results revealed the fact that whether silver was present or not, the amount of the copper deposited on the fibrous mats could affect the component and morphology of the formed copper sulfide microstructure. The growing process of these special microstructures of copper sulfide was investigated and the possible mechanism was also suggested. © 2009 Elsevier B.V. All rights reserved.

Loading Institute of Molecular Science collaborators
Loading Institute of Molecular Science collaborators