Luminescence of rhenium(I) complexes with highly sterically hindered .alpha.-diimine ligands

Structural and photophysical properties of [(CO)3(phen)Re(μ-Br)Re(phen)(CO)3]+[(CO)3Re(μ-Br)3Re(CO)3]−: Where does its luminescence come from?

“…The emission spectrum of the multimetallic complex presents a broad band with a maximum centered at 608 nm which is dominated by the MLCT transition. On the other hand, the monometallic compound [(phen)Re(CO) 3 Br], shows a blue-shifted emission band centered at 580 nm which is in accordance with emission reported for this kind of complexes [2,4]. Both emission spectra were independent of excitation wavelength.…”

“…Rhenium(I) tricarbonyl diimine complexes, [(N,N)Re(CO) 3 (X)] (X = halide), have received considerable attention in the last years due to their interesting photophysical and photochemical properties, which can be tuned by modifying either the nature of diimine ligand (N,N) or the L ligand itself (Cl, Br) [1][2][3][4][5]. These structural changes have direct influence on the character of the excited states [6,7].…”

Synthesis, characterization, photophysical and electrochemical properties of fac-tricarbonyl(4,7-dichloro-1,10-phenanthroline)rhenium(I) complexes

“…In particular, the rhenium(I) tricarbonyl polypyridyl complexes have been widely investigated due to their interesting triplet emissive properties 3,[14][15][16] . Additionally, intense effort has been dedicated to better understand the effect of the position and attachment of electron withdrawing/donating groups to ligands on the mechanistic events after excitation 15,[17][18][19][20][21] , which can contribute to a deeper comprehension of their emissive properties. For instance, electron withdrawing groups attached to polypyridyl ligands promote stabilization of 3 MLCT Re→NN excited state energy level (metal-to-ligand charge-transfer) 15,17,19,[21][22][23][24] .…”

Electrochemical and Spectroscopic Properties of Cyclometallated and Non-Cyclometallated Ruthenium(II) Complexes Containing Sterically Hindering Ligands of the Phenanthroline and Terpyridine Families

“…The ruthenium complexes synthesized and studied are determining the luminescence properties [6] provided that represented in Scheme 2 (1Ϫ6: noncyclometallated comthe steric constraint does not distort excessively the octa-pounds) and Scheme 3 (7Ϫ10: cyclometallated comhedral coordination. The schematic structures of the rel-pounds).…”