Verbindungen des Technetiums(IV) mit Hydroxyäthylidendiphosphon säure

The compositions of different compounds of 99Tc(IV) and hydroxy‐ethylidendiphosphonic acid have been evaluated using spectrophotometrical and potentiometric methods. The ligand reacts with K2TcBr6 as well as with TcO4′ and SnCl2 under formation of Tc(OH)3LH3, Tc(OH)3LH2−, TcOOHLH2−, Tc2(OH)4LH3 3+ Tc2(OH)6LH2, Tc2(OH)8L4− and Tc(OH)x(LHy)2(4‐x+8+2y)+ complexes respectively. In account of the minor technetium concentrations in 99mTc‐radiopharmaceuticals for skeletal imaging the last mentioned compound may be the major component in such preparations.