Stabilities and structures of metal ion complexes of adenosine 5‘-o-thiomonophosphate (AMPS2-) in comparison with those of its parent nucleotide (AMP2-) in aqueous solution

Sigel, Roland K O; Song, Bin; Sigel, Helmut

doi:10.1021/ja962970l

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Sigel, R. K. O., Song, B., & Sigel, H. (1997). Stabilities and structures of metal ion complexes of adenosine 5‘-o-thiomonophosphate (AMPS2-) in comparison with those of its parent nucleotide (AMP2-) in aqueous solution. Journal of the American Chemical Society, 119(4), 744–755. https://doi.org/10.1021/ja962970l

Abstract

The stability constants of the 1:1 complexes formed between Mg2+, Ca2+, Ba2+, Mn2+, Co2+, Ni2+, Zn2+, or Cd2+ and AMPS2-, i.e., of the M(AMPS) complexes, were determined by potentiometric pH titrations (25 °C; I = 0.1 M, NaNO3). For the Mn2+/AMPS, Co2+/AMPS, Ni2+/AMPS, and Cd2+/AMPS systems also the protonated species M(H;AMPS)+ were quantified, and for the Zn2+/AMPS system, the stability of the hydroxo species Zn(AMPS)(OH)-, which results from the Zn2+−thio coordination, could be determined. On the basis of previously established log