Time filter

Source Type

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.

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.

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.

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.

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.

Discover hidden collaborations