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Articles by Helen Stoeckli-Evans
Total Records ( 2 ) for Helen Stoeckli-Evans
  Muhammad Altaf , Helen Stoeckli-Evans , Syeda Shahzadi Batool , Anvarhusein A. Isab , Saeed Ahmad , Muhammad Saleem , Shafique Ahmad Awan and Muhammad Ashraf Shaheen
  Mercury(II) complexes of pyrrolidinedithiocarbamate (PDTC) having the general formula [Hg(PDTC)X] (X = Cl-, SCN-, and CN-) and [Hg(PDTC)2] have been prepared and characterized by elemental analysis, IR, and NMR. The crystal structure of [Hg(PDTC)2] has also been determined by X-ray crystallography, showing that the complex is a centrosymmetric dimer, [Hg2(PDTC)4] (bis[µ2-(pyrrolidinedithiocarbamato-S,S')(pyrrolidinedithiocarbamato-S,S')mercury(II)]) (1). The solid-state structure of 1 contains two crystallographically equivalent Hg(II) centers in a distorted tetrahedron.
  T. Uma Devi , N. Lawrence , R. Ramesh Babu , S. Selvanayagam , Helen Stoeckli-Evans and K. Ramamurthi
  Urea ninhydrin monohydrate (UNM) was synthesized and grown for the first time from aqueous solution employing the slow evaporation method. Single crystal structure was determined by X-ray diffraction data and it reveals that the crystal belongs to centrosymmetric with space group of P21/c. The grown crystals were characterized by thermogravimetric analysis (TGA), differential thermal analysis (DTA) and UV–vis–NIR spectroscopy. Preliminary Z-scan measurement indicates that nonlinear refractive index of this crystal is −4.1×10−8 cm2/W. The etching study was performed to assess the growth pattern of the crystal. Dielectric response of the crystal was analyzed for different frequencies and temperatures.
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