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The fluorescence properties o f t h e conformational isomer mixtures of trans-2-styryl-naphthalene provides further evidence for different radiative decay properties o f t h e two rotamers o f t h i s compound227 . T h e r e s o l u t i o n and c h a r a c t e r i s a t i o n h a s been m a d e o f t h e r o t a m e r s o f 1-phenyl-2- ( 2 - a n t h r y l ) ethylene2" and t h e three conformers i n case o f trans-di(2-napthyl)ethyleneaa9 . A c o m b i n e d p h o t o c h e m i c a l and UV a b s o r p t i o n s t u d y c o n d u c t e d i n r i g i d media elucidates t h e role o f rotamers in a z o n a p h t h a l i n e ~ ~ ~ ~ .

The fluorescence behaviour o f sequential t y r o s y l p o l y p e p t i d e s has been studied in a l k a l i n e solution336 and q u e n c h i n g by e n e r g y t r a n s f e r t o t r y p t o p h a n - 1 9 i n m e l i t t i n has been used i n c o n f o r m a t i o n a l s t u d i e s 337 . The environment o f tryptophan r e s i d u e s in a z u r i n h a s been e x a m i n e d by o b s e r v i n g e l e c t r o n i c e n e r g y t r a n s f e r w i t h and w i t h o u t t h e p r e s e n c e o f c o p p e r i o n s 3 3 8 .

4 F l e c t r o n i c F x c i t a t i o n Enerav T r a n s f e r . - T h e n u m b e r o f papers d e a l i n g w i t h t h e o r y and s i m p l e m o l e c u l e s a p p e a r t o h a v e d e c l i n e d o v e r r e c e n t years. An e x c e p t i o n t o t h i s s t a t e m e n t i n v o l v e s b i o l o g i c a l s y s t e m s and it i s i n b i o c h e m i s t r y t h a t m o s t s i g n i f i c a n t recent w o r k o n e l e c t r o n i c e x c i t a t i o n e n e r g y t r a n s f e r h a s been d o n e .

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