Substituent constant correlations as predictors of spectroscopic, electrochemical, and photophysical properties in ring-substituted 2,2'-bipyridine complexes of rhenium(I)

Synthesis, characterization, electrochemistry and luminescence studies of heterometallic gold(I)–rhenium(I) alkynyl complexes

“…The oxidation wave was found to be insensitive to the nature of the phosphine ligands present but was found to vary with the nature of the diimine ligand. Given the electro-inactive nature of Au(I), the oxidation was tentatively assigned as a Re(I)/Re(II) oxidation, as similar observations have also been reported in other related rhenium(I) diimine systems [35,36], such as the related [Re(bpy)(CO) 3 (py)] + which showed an oxidation wave at +1.74 V vs. SCE [40]. The assignment of the oxidation as ligand-centered oxidation was unlikely since both the diimine ligand and complexes 1 and 2 did not show any appreciable oxidation in the region.…”

Ultrafast Excited State Dynamics Controlling Photochemical Isomerization of N‐Methyl‐4‐[trans‐2‐(4‐pyridyl)ethenyl]pyridinium Coordinated to a {ReI(CO)3(2,2′‐bipyridine)} Chromophore

“…[ReA C H T U N G T R E N N U N G (OTf)(CO) 3 A C H T U N G T R E N N U N G (bpy)] [68] (1.185 g, 2.06 mmol; OTf = trifluoromethanesulfonate) and [MeDpe]PF 6 (1.057 g, 3.09 mmol) were heated at reflux in dry methanol (100 mL) for 12 h. The hot reaction mixture was filtered and NH 4 PF 6 (1 g) was added to the filtrate. The precipitate was collected by filtration and purified by repeated recrystallization from methanol.…”

“…À [54,55] shows that one-electron reduction of the MeDpe MLCTA C H T U N G T R E N N U N G (bpy) decay to the ground state would be % 230 ns. [68] ) Internal conversion from either . [24] Its rate is almost two times slower for MeDpe + ( % 21 ps) than stpy (11-12 ps), [23] presumably because of a larger delocalization of the p* electron in MeDpe + , resulting in a higher barrier.…”

pH‐Induced Luminescence Changes of Chromophore‐Quencher Tricarbonylpolypyridylrhenium(I) Complexes with 4‐Pyridinealdazine

“…It is noteworthy that both the πǞπ* transitions of X 2 bpy as well as the MLCT d π (Re)Ǟπ*(X 2 bpy) transitions are shifted to longer wavelengths when increasing the electron-accepting strength of the substituent X, as already reported for similar species. [9,13,15] On the other hand, when comparing the effect of ligands L in complexes of the type [Re(bpy)(CO) 3 [16] Ͼ 4,4Ј-bpy (λ max = 340 nm) [9] Ͼ PCA (λ max = 332 nm), [7] thus pointing to an increasing stabilization of the d π (Re) energy levels.…”