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Abstract <p>The complexation of the [<sup>99</sup>Tc(CO)<sub>3</sub>(H<sub>2</sub>O)<sub>3</sub>]<sup>+</sup> ion with phosphoric acid anions in aqueous solution was studied by <sup>99</sup>Тс NMR. In acid solutions, 1 : 1, 1 : 2, and 1 : 3 complexes with the H<sub>2</sub>PO<sub>4</sub><sup>–</sup> anion are formed; their stepwise stability constants are 1.0 ± 0.2, 0.20 ± 0.03, and 0.07 ± 0.03 L/mol, respectively. The complexation with the HPO<sub>4</sub><sup>2–</sup> anion at pH 6–7 is complicated by the hydrolysis of the triaqua complex to form the stable tetramer [<sup>99</sup>Tc(OH)(CO)<sub>3</sub>]<sub>4</sub>. The stability constant of the 1 : 1 complex with the HPO<sub>4</sub><sup>2–</sup> ion is estimated at 10<sup>2</sup> L/mol. Higher-field signals assignable to the 1 : 2 and 1 : 3 complexes with the HPO<sub>4</sub><sup>2–</sup> and H<sub>2</sub>PO<sub>4</sub><sup>–</sup> anions are also observed.</p>

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Complexation of the [99Tc(CO)3(H2O)3]+ Ion with Phosphoric Acid Anions in Aqueous Solution: A 99Тс NMR Study

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • G. V. Sidorenko,
  • A. E. Miroslavov,
  • L. S. Chisty,
  • A. P. Sakhonenkova,
  • M. Yu. Tyupina,
  • T. S. Ulidova

摘要

Abstract

The complexation of the [99Tc(CO)3(H2O)3]+ ion with phosphoric acid anions in aqueous solution was studied by 99Тс NMR. In acid solutions, 1 : 1, 1 : 2, and 1 : 3 complexes with the H2PO4– anion are formed; their stepwise stability constants are 1.0 ± 0.2, 0.20 ± 0.03, and 0.07 ± 0.03 L/mol, respectively. The complexation with the HPO42– anion at pH 6–7 is complicated by the hydrolysis of the triaqua complex to form the stable tetramer [99Tc(OH)(CO)3]4. The stability constant of the 1 : 1 complex with the HPO42– ion is estimated at 102 L/mol. Higher-field signals assignable to the 1 : 2 and 1 : 3 complexes with the HPO42– and H2PO4– anions are also observed.