Two methods for the synthesis of the [99mTc≡N] intermediates were reported. In the presence of reducer (TPPS or SnCl2) and the donor of N
the mixture of [99mTc≡N] intermediate could be conveniently synthesized but with different composition. On reaction with ligands complexes containing [99mTc≡N]2+ core can be obtained. The change of composition of Intermediates was detected by HPLC at different PH values