Figure 2:

a) Normalized UV/VIS/NIR-absorption and emission spectrum of the rhenium complexed Si-rhodamine in water/ethanol (5%) with an excitation wavelength of 650 nm. b) IVIS-imaging of 10 in PBS/EtOH (5%) with different concentrations to receive the optimal amount of fluorophore for future in vitro/in vivo experiments. The samples were excited with a wavelength of 640 nm and the emission was recorded at a wavelength of 710 nm.