Fig. 2 Dependence of the NH 1 H NMR chemical shifts of complex 2 [Pt([ 15 N 3 ]dien)(5A-GMP-N 7 )] 2+ on pH; peak a (5), b (-) c (.), d (3). The large downfield shifts of two of the resonances between pH 5 and 7 can be associated with deprotonation of the 5A-phosphate group, and between 7 and 9 with deprotonation of N 1 H of GMP. Little shift of peak e (Fig. 1) was observed over this pH range.
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