Rhenium(I) coordinated lumazine and pterin derivatives: structure and spectroelectrochemistry of reversibly reducible (6-ATML)Re(CO)3Cl (6-ATML=6-acetyl-1,3,7-trimethyllumazine)

Synthesis, characterization and antiproliferative behavior of tricarbonyl complexes of rhenium(I) with some 6-amino-5-nitrosouracil derivatives: Crystal structure of fac-[ReCl(CO)3(DANU-N5,O4)] (DANU=6-amino-1,3-dimethyl-5-nitrosouracil)

“…The bite angle formed by O4AReAN5 is reduced significantly from the expected octahedral 90°value to 75.0(2)°. This value is consistent with those obtained for other tricarbonylrhenium(I) compounds with a-diimine, lumazines and hydrazones ligands that form five-membered metallocyclic rings [16][17][18][19]29].…”

“…These properties can be tuned with an appropriate ligand, then becoming appropriate for biomedical purposes due to the increase in vivo stability and the low interference with biological activity. The choice of the ligand is very important for the development of new radiopharmaceuticals reagents; thus, studies on rhenium(I) complexes with ligands as aromatic N-heterocycles, carboxylates and amines have shown a great effectiveness [12][13][14][15][16][17][18][19][20].…”

Nucleophilic addition of water to 1-isoquinolinyl phenyl ketone. The synthesis, spectroscopic investigation, crystal and molecular structure and DFT calculations of [ReOBr2(iquinpk-OH)(PPh3)]

“…This coordination produces a five-membered ring containing an unsaturated a-iminoketo function which can act as a p acceptor towards a bound p electron-rich metal center such as rhenium(III). The a-iminoketo chelation plays an important role in the biosynthesis of the pterins, lumazines, flavins coenzymes [12,13].…”

“…This coordination produces a five-membered ring containing an unsaturated a-iminoketo function which can act as a p acceptor towards a bound p electron-rich metal center such as rhenium(III). The a-iminoketo chelation plays an important role in the biosynthesis of the pterins, lumazines, flavins coenzymes [12,13].Here, we report the synthesis, spectroscopic investigation, crystal and molecular structure for the [ReOBr 2 (iquinpk-OH)(PPh 3 )] complex.The title compound has been obtained in the reaction of [ReOBr 3 (PPh 3 ) 2 ] [14] with 1-isoquinolinyl phenyl ketone in acetone [15]. In this case the carbonylic carbon atom of the 1-isoquinolinyl phenyl ketone is a subject to nucleophilic attack of water and the gem-diol form of iquinpk is formed.…”

Synthesis, characterization and molecular structure of Re(III) complexes containing 2-benzoylpyridine

“…This coordination produces a five-membered ring containing an unsaturated a-iminoketo function, which plays an important role in the biosynthesis of the pterins, lumazines, flavins coenzymes [17,18]. The coordination of the oxygen atom of 2-benzoylpyridine to the metal center causes the C@O bond to weaken, and a significant decrease in m(C@O) from $1670 cm À1 in the free ligand to about 1590 cm À1 for [ReX 3 (bopy)(PPh 3 )] is observed [19].…”