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Showing papers by "Mariana Mitewa published in 1989"


Journal ArticleDOI
TL;DR: In this paper, a slow redox process is described for a green monomeric system with a marked decrease of plI and I s s e n s i t i v e t i c and i s s i c e a c i d i t o t h e a C i d I t y, t o T h e n a t u r e r e of t H e s o l v e n t (1120, D,O or organic S o l V E n t ) and the presence of O2 as wel l
Abstract: A b s t r a c t The i n t e r a c t i o n of P t ( I 1 ) with c r e a t i n i n e i s s t u d i e d i n d i f f e r e n t r e a c t i o n c o n d i t i o n s . A t L:M r a t i o from 4 t o 10 s e v e r a l new complexes of P t ( I 1 ) a r e o b t a i n e d , s t u d i e d by s p e c t r o s c o p i c methods and X-ray d i f f r a c t i o n . I n these monomer i c s p e c i e s the l i g a n d i s coord ina ted only through the endogenic n i t r o g e n . A t L:M = 1 a slow redox process t a k e s p l a c e leat i ing t o the format ion of s e v e r a l ( n e u t r a l , a n i o n i c and cat i o n i c ) b l u e t o green paramacne t i c s p e c i e s . The process proceeds on with a marked decrease of plI and i s s e n s i t i v e t o t h e a c i d i t y , t o t h e n a t u r e of t h e s o l v e n t (1120, D,O or organic s o l v e n t ) and t o t h e presence of O2 as wel l . A-green monomeric s p e c i e s was i s o l a t e d and s t u d i e d by X-ray s t r u c t u r a l a n a l y s i s .

18 citations


Journal ArticleDOI
TL;DR: In this article, three Ni(II)-creatinine complexes are synthesized in organic media and it is proved that the complexes are formed only in nonaqueous media and their dissolution in water is connected with immediate dissociation.

16 citations