Neutral oxorhenium(V) complexes with tridentate dithiolates and monodentate alkane- or arene-thiolate coligands

Investigations of the {ReO}3+ core: A ‘2+2’ complex from bidentate and potentially trident ligands: [ReO(η2-HOC6H4-2-CH2NC6H4S)(η2-SC5H4N)(PPh3)]

“…In this connection, one approach has focused on the robust {ReO} 3+ core in combination with ligands possessing different donor sets and denticities. The most extensively developed strategy exploits '3+1' ligand combinations, which contain a dianionic tridentate ligand with various donor atoms, but requiring at least one thiolate sulfur, and a monodentate thiol [6][7][8][9]. In addition, '2+2' ligand combinations [10] and more recently '3+2' chelates have been exploited [11,12].…”

New Organometallic Technetium Complexes for Radiopharmaceutical Imaging

“…Unfortunately, brain uptake was too small to make this compound relevant for CNS receptor density imaging. 22 …”

“…Another core that merits attention is "[TcϵN] 2+ ", also with technetium in oxidation state +V and similar chemical behaviour in respect of aquo ions as in [Tc=O] 3+ [17][18][19][20]. Besides these two central moieties, the mixed-ligand [3+1] concept based on the [Tc=O] 3+ core is widely applied in research [21,22]. The approach is problematic for certain biomolecules since in vivo instability of complexes has been observed.…”

New Mixed-Ligand ReV Complexes with Bis(2-mercaptoethyl) Sulfide and Functionalized Thioimidazolyl Ligands

“…In both compounds the coordination geometry around the five-coordinate Re v atom is best described as distorted square-pyramidal, with the axial ReϪO(1) bond length significantly shorter than the ReϪL(basal) distances. The ReϭO (1) ReϪO (1) 1.683 (8) 1.673 (5) ReϪS (1) 2.285 (3) 2.290(2) ReϪS (2) 2.367 (3) 2.364(2) ReϪS (3) 2.285 (3) 2.282(2) ReϪS (4) 2.327 (3) 2.345(2) S(4)ϪC (5) 1.745 (13) 1.734 (7) (3) 130.35 (14) 127.86 (7) S(3)ϪReϪS (4) 87.64 (12) 88.29(7) S(1)ϪReϪS (4) 82.38 (12) 81.15(7) S(3)ϪReϪS (2) 84.25 (11) 84.44(7) S(1)ϪReϪS (2) 84.18 (11) 84.76(7) S(4)ϪReϪS (2) 154.00 (11) 155.29(7) ReϪS(4)ϪC (5) 110.7(4) 110.1 (2) 3ϩ1 compounds. [1Ϫ6,12Ϫ16] The CϪS bond lengths [1.745(13) Å (1), 1.734(7) Å (2)] are comparable and are similar to those found previously, [17] which range from 1.68 to 1.73 Å .…”