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  • TITLE
  • CERTIFICATE
  • DECLARATION
  • ACKNOWLEDGEMENT
  • CONTENTS
  • PREFACE
  • 1. INTRODUCTION TO THE METHODOLOGY OF X-RAY STRUCTURE DETERMINATION
  • 1.1 Diffraction from Crystals
  • 1.2 Reciprocal Lattice
  • 1.3 Ewald Sphere
  • 1.4 Atomic Scattering Factor
  • 1.5 Structure Factor
  • 1.6 Crystallization
  • 1.7 Selection of Single Crystals
  • 1.8 Photographic Methods
  • Oscillation Method
  • Weissenberg Method
  • 1.9 Collection of Intensity Data
  • Fig.1.5. Schematic diagram of the CAD4 single crystal x-ray diffractometer
  • 1.10 Data Reduction
  • Fig.1.6. The bisecting geometry arrangement
  • 1.11 Scaling
  • 1.12 Methods of Structure Solution
  • 1. Patterson Method
  • 2. Direct Methods
  • 1.13 Origin Fixing
  • 1.14 Structure Invariants and Semi invariants
  • 1.15 Phase Relationships
  • 1.16 Tangent Formula
  • 1.17 Structure Refinement
  • 1.18 Weighting Scheme
  • 2. IMPORTANCE OF CURCUMIN AND ITS DERIVATIVES - AN INTRODUCTION
  • 3. CRYSTAL STRUCTURE OF 1, 7-BIS (PHENYL) -4- (1, 3-DITHIOLAN-2 YLIDENE) -1, 6-HEPTADIENE-3, 5-DIONE AND ITS PHOTOPRODUCT
  • 3.1 Introduction
  • 3.2 Synthesis
  • 3.3 Crystallization and Data Collection
  • 3.4 Structure Solution and Refinement
  • 3.5 Results
  • 3.6 Discussion
  • Ketene dithioacatal group paves the way to cycloaddition
  • Comparison of molecular parameters
  • Intermolecular interactions and crystal packing
  • FIGURES
  • Tables
  • 4. CRYSTAL STRUCTURE OF 1, 7-BIS (CHLOROPHENYL) -4- (1, 3 DITHIOLAN-2-YLIDENE) -1, 6-HEPTADIENE-3, 5-DIONE AND 1, 7-BIS (4 METHOXYPHENYL) -4- (1, 3-DITHIOLAN-2-YLIDENE) -1, 6 HEPTADIENE-3, 5-DIONE
  • 4.1 Introduction
  • 4.2 Synthesis
  • 4.3 Crystallization and Data Collection
  • 4.4 Structure Solution and Refinement
  • 4.5 Results
  • 4.6 Discussion
  • FIGURES
  • Tables
  • 5. CRYSTAL STRUCTURE OF 1, 7-BIS (2-THIENYL) -4- (1, 3-DITHIOLAN-2 YLIDENE) -1, 6-HEPTADIENE-3, 5-DIONE AND 1, 7-BIS (FURYL) -4- (1, 3 DITHIOLAN-2-YLIDENE) -1, 6-HEPTADIENE-3, 5-DIONE
  • 5.1 Introduction
  • 5.2 Synthesis
  • 5.3 Crystallization and Data Collection
  • 5.4 Structure Solution and Refinement
  • 5.5 Results
  • 5.6 Discussion
  • FIGURES
  • Tables
  • 6. CRYSTAL STRUCTURE OF 3- (1, 3-DITHIOLAN-2-YLIDENE) PENTANE-2, 4-DIONE AND 1, 1-BIS (METHYLTHIO) -5- (4 CHLOROPHENYL) -1, 4-PENTADIENE-3-ONE
  • 6.1 Introduction
  • 6.2 Synthesis
  • 6.3 Crystallization and Data Collection
  • 6.4 Structure Solution and Refinement
  • 6.5 Results
  • 6.6 Discussion
  • FIGURES
  • Tables
  • 7. MOLECULAR STRUCTURES OF METHYL 5, 6-DI (O-METHOXY PHENYL) -1, 2, 4-TRIMETHYL-7-OXOBICYCLOj2.2.I JHEPT-5-ENE-2 (ENDO) CARBOXYLATE AND METHYL 7-HYDROXY-5, 6-BIS (PHENYL) -1, 2, 4-TRIMETHYL BICYCLO[2.2.1JHEPT-5-ENE-2 (ENDO) CARBOXYLATE
  • 7.1 Introduction
  • 7.2 Crystallization and Data Collection
  • 7.3 Structure Solution and Refinement
  • 7.4 Results
  • 7.5 Discussion
  • FIGURES
  • Tables
  • 8. SUMMARY
  • 8.1 A comparative study of the Structural parameters of Compounds I, III, IV, V and VI
  • 8.2 Norborne Structures
  • REFERENCES
  • APPENDIX A - J