Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/65542
Title: Crystal and molecular structure of azobenzene 2 sulphenyl cyanide
Researcher: Kakati, Kandarpa Kumar
Guide(s): Chaudhuri, Bhumidhar
Keywords: Anisotropic
Centrosymmetrical
Electron-Density
Lattice
Molecular
Optical-Transform
Structure
Unit-Cell
University: Gauhati University
Completed Date: 31/12/1966
Abstract: The main subject matter of this work is the determination of molecular and crystal structure of azobenzene-2-sulphenyl cyanide. In investigating the trial structure free use of the optical transform technique has been made at the initial stages. The structure has, however,been refined by two-dimensional Fourier synthesis. In chapter one, the general prin-ciples of the application of optical-transform methods have been described, along with a short description of the quotOptical diffractometerquot. The second chapter has been devoted to discuss in brief the chemistry of azobenzene-2-sulphenyl cyanide. Determination of unit-cell and space group has also been discussed here. In the third chapter, the procedures adop-ted for obtaining the approximate structure have been described. The derivation of unitary structure factors, the scope of optically derived transform, and the impor-tance of the weighted reciprocal lattice in providing informations regarding significant structural features have been dealt with. Further, the use of Patterson synthesis to locate the sulphur atom of the azobenzene-2-sulphenyl cyanide molecule has been discussed in this chapter. The refinement of the trial structure of the centrosymmetrical c-axis projection has been discussed in chapter four. In the earlier stages of refinement of procedure of optical sign determination has been used for obtaining the signs of the structure factors. Refinement of the (001) projection by (Fo-Fc) synthesis has been discussed in chapter five. An attempt to locate the hydrogen atoms from the (Fo-Fc) synthesis and the use of optically derived transform to locate the same have been discussed here. The differ-ence Fourier map has been exploited to the extent of adjusting the individual temperature factor parameters of some of the atoms including the anisotropic tempe-rature factor parameter of sulphur. Extinction correc-tion for some of the low-angle strong reflexions and use of these corrected structure factors in re-drawing the electron-density map has been included...
Pagination: 
URI: http://hdl.handle.net/10603/65542
Appears in Departments:Department of Physics

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01_title page.pdfAttached File14.13 kBAdobe PDFView/Open
02_acknowledgement.pdf27.14 kBAdobe PDFView/Open
03_abstract.pdf63.18 kBAdobe PDFView/Open
04_content.pdf64.91 kBAdobe PDFView/Open
05_chapter 1.pdf692.94 kBAdobe PDFView/Open
06_chapter 2.pdf207.13 kBAdobe PDFView/Open
07_chapter 3.pdf1.16 MBAdobe PDFView/Open
08_chapter 4.pdf881.85 kBAdobe PDFView/Open
09_chapter 5.pdf603.1 kBAdobe PDFView/Open
10_chapter 6.pdf384.04 kBAdobe PDFView/Open
11_chapter 7.pdf229.85 kBAdobe PDFView/Open
12_references.pdf134.57 kBAdobe PDFView/Open


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