Patent ID: 6926883

Claim:
A method of preparing a compound of formula: fac-[M(CO) 3 L x ] n (II) comprising reacting a ligand L x with a compound of formula (I) fac-[M(CO) 3 (OH 2 ) 3 ] + (I) wherein: M is Mn, 99m Tc, 186 Re or 188 Re; L x is a non-aromatic aminopolycarboxylate multidentate selected from the group consisting of diethylenetriamine-pentaacetic acid (DTPA), ethylenediaminetetraacetic acid (EDTA), 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA), nitrilotriacetic acid (NTA), and triazacyclononanetriacetate, said multidentate containing at least three carboxylate groups, and n is a charge of the ligand L x increased with one + charge.