الفهرس 
Absorption spectraOnly 14 pages are availabe for public view
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Abstract
The present t h e s i s includes a study of the s p e c t r a l behaviour of o-hydroxy. aromatic Schiff’s bases d e r i v a t i v e s . The compounds were i n v e s t i g a t e d i n the uv.,visible, ir., s p e c t r a l region, besides the ’H nmr spectra. The methods which have been used include s u b s t i t u t i o n e f f e c t s , solvent e f f e c t , protonation e f f e c t on the specta and the determination of i o n i z a t i o n and protonation constants of hydroxy and azomethine groups respectively. Further the photochromsb of 0-hydroxy-bebzylidenea n i l i n e d e r i v a t i v e s was studied by the f l a s h photolysis. The study i n c l u d e s the e f f e c t of s o l v e n t and s u b s t i t u t i o n on the hecity coktaats of the t r a n s i e n t photochromic species , and on the t r a n s i e n t absorption s p e c t r a of photochromic intermediates. The t h e s i s includes a l s o the behaviour o f o f o-hydroxy benzylideneaniline d e r i v a t i v e s i n the e x c i t s d s t a t e s at 0 room temperature and 77 K. 1 - In the f i r s t chapter, a general survey of the previous work dealing with the s p e c t r a of hydroxy Schiff’s i n the ground and excited s t a t e s and t h e i r photochromism a r e given. 2- Chapter I1 comprises the experimental d e t a i l s for preparation of o-hydroxy aromatic Schiff`s.