| abstract |
This invention concerns novel bidentate ligands L having two phosphorus or arsenic atoms. Cationic complexes of the ligands with Technetium-99m, e.g. having the formula [TcO 2 L 2 ] + , are useful for body imaging, particularly myocardial imaging. The ligands have the general formula n n Y.sub.2 QZQY.sub.2 n n where Q is phosphorus or n Z is a --CC-- or --CCC-- or --COC-- groups, n the four groups Y are all C1-C8 saturated hydrocarbon or fluorohydrocarbon with 1-3 ether oxygen atoms. |