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Re(I)tricarbonyl rhenium(I)complexes attracted much attention owing to the good cellular uptake ability and rich photophysical properties.However,normally Re(I)complexes show short triplet state lifetime and weak absorption in the visible spectra region,and the absorption wavelength usually is shorter than 450 nm.These features are detrimental to the applications of Re(I)complexes in the areas such as photodynamic therapy(PDT)and luminescence bioimaging.Herein,a novel tricarbonyl rhenium(I)complex Re-1 with strong visible light-absorbing ability(624 nm,ε=5.69′10~4 L/(mol cm)),long-lived triplet excited state(ν_T=448.9ms)and moderate fluorescence quantum yield(Φ_F=41.6%)was prepared.The photophysical properties of Re-1 were studied with steady state UV-Vis absorption and luminescence spectroscopies,nanosecond transient absorption spectroscopy,as well as DFT/TDDFT calculations.Re-1 was used for intracellular PDT and luminescence imaging studies.The results indicate that Re-1 shows low dark toxicity,but it is able to kill cancer cells on illumination with 635 nm LED.
Re (I) tricarbonyl rhenium (I) complexes attracted much attention due to the good cellular uptake ability and rich photophysical properties. Despite, normally Re (I) complexes show short triplet state lifetime and weak absorption in the visible spectra region, and the absorption These features are detrimental to the applications of Re (I) complexes in the areas such as photodynamic therapy (PDT) and luminescence bioimaging. Herein, a novel tricarbonyl rhenium (I) complex Re-1 with strong The long-lived triplet excited state (ν_T = 448.9 ms) and the moderate fluorescence quantum yield (Φ_F = 41.6%) were prepared by using visible light-absorbing ability (624 nm, ε = 5.69’10 ~ 4 L / (mol cm) The photophysical properties of Re-1 were studied with steady state UV-Vis absorption and luminescence spectroscopies, nanosecond transient absorption spectroscopy, as well as DFT / TDDFT calculations. Re-1 was used for intracellular PDT and luminescence imaging studies. Re-1 shows l ow dark toxicity, but it is able to kill cancer cells on illumination with 635 nm LED.