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Solvothermal reaction of 2,2′-bipyridine-5,5′-dicarboxylic acid (H2bpdc) and SrCl2 affords a novel coordination polymer [Sr(Hbpdc)2]n 1. X-ray structure determination shows that 1 exhibits a novel three-dimensional network. The unique Sr II cation sits on a two-fold axis and coordinated by four O-atom donors from four Hbptc− ligands and four N-atom donors from two Hbptc− ligands in distorted dodecahedral...
The in situ [2+3] cycloaddition reaction of 1,3-dithiole-2-carbonitrile and NaN3 in the presence of ZnSO4·7H2O, water and ethanol affords a novel 3D-diamond-like networks with diamond subunits as connecting nodes, [(CN4-C3H2S2)2Zn]n, (1). X-ray diffraction structural analysis reveals that complex 1 crystallized in tetragonal crystal system and with I-42d space group. The second harmonic generation...
In view of the distributing feature of DWT (Discrete Wavelet Transform) coefficients , an watermark algorithm based on DWT and Chaos mapping is represented. The watermark image is first transformed by Logistic mapping to an unmeaning image in the field, and the positions of embedding the secret image are obtained by exploiting the characteristics of the human visual system (HVS). Detecting procedure...
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