“…[88][89][90][91][92][93] Thioether (N,S,S) and (S,S,S) ligands have also been developed. 78,94 Phosphine-containing ligands, with (P,N,P), (P,S,S), and (P,O,O) donor atoms ( Figures 16.5 and 17), have been used to form in vivo stable [ 99m Tc(CO) 3 ] complexes in high yields. [95][96][97] Ligands may also contain the water-soluble, air stable hydroxymethylphosphine.…”