Photophysical properties of rhenium(i) complexes and photosensitized generation of singlet oxygen.

fac-[Re(ampy)(CO) ₃ (NN)] ⁺ complexes (ampy = 2-aminomethylpyridine and NN = 1,10-phenanthroline (phen), and 2,2'-bipyridine (bpy)) were synthesized, purified and characterized by proton nuclear magnetic resonance ( ¹ H NMR), UV-visible and Fourier-transformed infrared (FT-IR) spectroscopies, and their photophysical properties were investigated using steady state and time-resolved emission spectroscopies. The electronic absorption spectra exhibit two main absorption bands: the higher energy band, which was assigned to intraligand transition (IL), and the lower energy band assigned to metal-to-ligand charge transfer (MLCT). Both complexes showed emission at room temperature in a CH ₃ CN solution (λ _max = 560 nm, ϕ = 0.091, τ = 560 ns for fac-[Re(ampy)(CO) ₃ (phen)] ⁺ ; λ _max = 568 nm, ϕ = 0.024, τ = 100 ns for fac-[Re(ampy)(CO) ₃ (bpy)] ⁺ ) and rigid media (λ _max = 530 nm, τ = 3300 ns for fac-[Re(ampy)(CO) ₃ (phen)] ⁺ ; λ _max = 530 nm, τ = 853 ns for fac-[Re(ampy)(CO) ₃ (bpy)] ⁺ ) arising from the lowest lying ³ MLCT _Re→NN excited state. Both complexes along with fac-[Re(L)(CO) ₃ (NN)] ^+/0 complexes, L = Cl or pyridine, were capable of efficiently photosensitizing the generation of singlet oxygen with quantum yield in the range of 0.59-0.28. These results highlight the potential application of fac-[Re(L)(CO) ₃ (NN)] ^+/0 complexes in the development of sensitizers for the generation of singlet oxygen.