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7751000 
Journal Article 
The stability constants of thallium(I)-guanosine monophosphate complexes 
Gharib, F; Sadatkiaei, A 
2003 
1 
Main Group Metal Chemistry
ISSN: 0792-1241 
26 
5 
303-312 
English 
WOS:000220169200005 
The stability constants of the complexes of thallium(I) ion with guanosine 5′-monophosphate, GMP, were determined in aqueous solution at 25°C and 0.1 mol dm-3 ionic media, using a combination of potentiometric and spectrophotometric techniques. Sodium perchlorate was used to maintain the ionic strength. The compositions of the formed complexes were determined and it was shown that thallium(I) forms three mononuclear 1:1 species with GMP of the type TlH2(GMP)+, TlH(GMP), and Tl(GMP)-. The logarithms of the cumulative stability constants, βxyz, of the complexes, [(Tl)x(H)y(GMP)z], are 3.53, 3.03, and 5.47, respectively. The FTIR spectra of both GMP and Tl+-GMP were studied in aqueous solution and solid state in 1800-500 cm-1 region. The spectra suggest the coordination sites of GMP by Tl(I) complexes are N7 and phosphate groups.