R5509 42 nir pmt

Steady-state emission spectra were measured on a PTI Quantamaster spectrometer. The detectors used were a K170B PMT for UV to NIR (max ≈ 800 nm) wavelengths, and a Hamamatsu R5509–42 NIR PMT for longer wavelengths (600–1400 nm). The instrument internally corrected for wavelength-dependent nonlinearities in lamp output and detector sensitivities. Generally, the most intense and longest-wavelength peak in the excitation spectrum was chosen for λ_ex.

Quantum yields for singlet oxygen sensitization (Φ_Δ) were measured using the intensity of the ¹O₂ emission band, centered around 1276 nm, as measured on a PTI Quantamaster emission spectrometer equipped with a Hamamatsu R5509–42 NIR PMT. The instrument was internally corrected for wavelength-dependent nonlinearities in lamp output and detector sensitivities.
[Ru(bpy)₃]²⁺ was used as the actinometry standard (Φ_Δ = 0.56 in aerated MeCN(56 (link))) in Equation 1, where I denotes the emission integration, A is the UV-Vis absorption of the solution at the excitation wavelength, and η is the solvent’s refractive index (η²/η_S²=1 in this case, since MeCN was used for both). The standard is indicated by the subscript S.
These measurements were performed as 20 μM solutions of complexes in acetonitrile prepared from a 1 mM stock in CD₃OD (to facilitate dissolution of the chloride salts; final 2% v/v CD₃OD). The local MLCT absorption maximum in the UV-vis spectrum (around 463 nm) was chosen for the excitation wavelength. The emission was collected between 1200–1350 nm using a 1000 nm long-pass filter, and baseline corrected.

Steady state emission spectra were acquired in Ar-sparged PBS solution using a PTI Quantamaster spectrometer equipped with a Hamamatsu R5509-42 NIR PMT (range ≈600–1400 nm). The spectrometer internally corrected any wavelength-dependent nonlinearities in lamp output and detector sensitivities. The most intense, longest-wavelength peak in the excitation spectrum was chosen as λ_ex.