Synthesis and X-ray structure of bis-[Re2(CO)9] complex of 3,3′,4,4′-tetramethyl-1,1′-diphosphaferrocene functionalised complex as a potential radiopharmaceutical and metallocarbonyl marker

3,3′,4,4′-Tetramethyl-1,1′-diphosphaferrocene reacts with two mole equivalents of [Re2(CO)10]/Me3NO to afford bis-[Re2(CO)9] complex 4. The X-ray structure of this complex revealed equatorial ReP bonds. The same reaction with a functionalised derivative of 3,3′4,4′-tetramethyl-1,1′-diphosphaferrocene 1b afforded N-succinimidyl ester 2, potential reagent for introduction of the large amount of radioactive rhenium into target-specific biomolecules.