Synthesis and Structural Characterization of Dinuclear Oxorhenium(V) Complexes with Bidentate Imidazole Derivatives

Abstract

The oxo-bridged dinuclear complexes [(-O)were prepared by reaction of trans-[ReOCl 3 (PPh 3 ) 2 ] with L in acetone. X-ray crystallographic studies of the eami and etmi complexes show that these ligands coordinate in a bidentate manner, and that the cis, cis-N 2 Cl 2 and cis, cis-NSCl 2 equatorial planes are nearly orthogonal to the O¼Re-O-Re¼O backbone.

Electronic and Molecular Structures of trans-Dioxotechnetium(V) Polypyridyl Complexes in the Solid State

“…This shortening is consistent with the electron density of the respective Tc(V) metal centers. The bond distances and angles associated with the ligands are reminiscent of those reported for trans -[TcO 2 (TBP) 4 ]CF 3 SO 3 ·H 2 O (TBP = 4- tert -butylpyridine) and the dioxo-Re analogs. ,− The plane of the pyridyl rings is rotated away from the OTcO axis with average rotations of 17.53°, 15.45°, and 12.88° for 1a , 2a , and 2b , respectively. Furthermore, two pyridyl rings are rotated in the clockwise direction while the remaining two are rotated counter-clockwise.…”

“…It should be noted that the range of Re(V) and Tc(V) structures with the general formula trans - [MO 2 (imine) 4 ] + can be classified as having either two identical MO bond distances ,− , or two dissimilar MO distances. − In most reported cases with dissimilar MO distances, a solvate molecule is involved in a strong intermolecular interaction with one of the oxo substituents. This is caused by a TcO···(solvent) H-bonding interaction and is evidently responsible for the disparity in the distances.…”

Reaction of Perrhenate with Phthalocyanine Derivatives in the Presence of Reducing Agents and Rhenium Oxide Nanoparticles in Biomedical Applications

“…In this study, we attempted to form oxidorhenium(V)−Pc complexes by reduction of perrhenate with sodium borohydride in the presence of free Pcs and the rhenium oxide nanoparticles were isolated with rhenium in different oxidation states. Given the possible radiopharmaceutical application of Re‐186/188, [11] we explored their potential as nanomedicine drugs by studying their localization in cancer cells for targeted nanoradiopharmaceutical applications. Generally, nanoparticles possess the ability to overcome the shortcomings that are presented by traditional drugs such as drug resistance at the cellular level, distribution, clearance of anticancer drugs in the body, and drug resistance at the tumour level due to physiological barriers and biotransformation [12] .…”

A rhenium(V) complex containing a terdentate chelate with an imido donor atom: synthesis and structure of [Re(aps)I(PPh3)2]I (H3aps = N-(2-aminophenyl)-salicylideneimine)

“…The coordination chemistry of rhenium(V) is dominated by the presence of the oxo group, which limits the variety of different rhenium(V) cores and complexes by influencing their structure, geometry and reactivity [1][2][3]. As a result, there are numerous attempts to replace the oxo group, for example with the imido entity [4][5][6].…”