الفهرس | Only 14 pages are availabe for public view |
Abstract I’ The thesis comprises three chapters:- Chapter I. Introduction: Deal with a literature survey on the theories, models, spectroscopic studies, as well as importance and applications of hydrogen bond Chapter 11. Materials and methods: Includes the methods of preparation of complexes of DHBQ with different amines, elemental analysis for the prepared complexes, the different techniques and instruments used to characterize and study the chemical and physical properties of the isolated compounds such as: the FT-IR and UVNis. Chapter Ill. Results and discussion:- This chapter deals with the equilibrium constants for the proton transfer complexes formation Kpy between 2,5-diliydroxy-p-benzoquinone. (DHBQ) and a group of tertiary aliphatic and aromatic amines. The correlation between log KpT and pKa (amines) includes two straight lines representing the aromatic and aliphatic tertiary amine complex. The thermodynamic data for these hydrogen bonded complexes suggested a weak hydrogen bond in aromatic amines-DHBQ complexes and a moderately strong one in aliphatic amines-DHBQ complexes. The short-range solvation effect on the proton transfer equilibria between DHBQ and some aminopyridines in 700/0 benzene and 30%. |