Bioconjugates of metal complexes of nitrogen-containing macrocyclic ligands

A compound which is complex represented by the

• wherein said biomolecule is independently selected from the group consisting of steroids, carbohydrates, fatty acids, amino acids, peptides, proteins, antibodies, vitamins, lipids, phospholipds, phosphates, phosphonates, nucleic acids, enzyme substrates, enzyme inhibitors and enzyme receptor substrates.