| abstract |
The invention relates to the use of radioactive metallocene carboxylic acids and their derivatives of formula I, (I) in which R1, R2, R3, R4 and R5 have different meanings, and M stands for a radioactive metal isotope of the elements of atomic numbers 21-29, 31, 42-44, 49 or 57-83, for radioactive labeling of NH-active compounds, a process for labeling the latter, as well as new metallocene carboxylic acid derivatives of formula I with M meaning a Cr-51, Mn-52, Ru-97, Ru-103, Re-186, Re-188, Ir-191 isotope. |