interaction of thallium (i) with cytidine 5
-monophosphate in different ionic strengths and various media

the formation constants of the species formed in the systems h+ + cytidine 5
-monophosphate (cmp)and h+ + cytidine 5
-monophosphate + tl (i) ion have been determined in aqueous solution in a wideph range of 1.5 to 10.5 at 25 °c and different ionic strengths ranging from 0.1 to 1.5 moldm-3naclo4, nano3, and nacl using potentiometric-spectrophotometric technique. the composition ofthe complexes was specified and was shown that thallium ion forms mononuclear two 1:1 complexeswith cmp. the general trend for the protonation constants of cmp and its complexes with thallium(i) are in the order of naclo4> nano3> nacl in different ionic media. the dependence of formationconstants on ionic strength are described by a debye-huckel type equation and interpreted for thevarious supporting electrolytes.