Rhenium and technetium-complexed silicon rhodamines as near-infrared imaging probes for bimodal SPECT- and optical imaging

Abstract

Fluorescent Si-rhodamines were modified to enable complexation with the Re(I)- and ^99mTc(I)-tricarbonyl core. The corresponding complexes exhibit suitable properties as bimodal imaging probes for SPECT- and optical imaging in vitro. Importantly, the novel in- aqueous-solution-stable, functionalized Si-rhodamines retain favourable optical properties after complexation (QY = 0.09, λ_abs = 654 nm, λ_em = 669 nm in PBS) and show promising near-infrared optical properties for potential in vivo applications enabling bimodal scintigraphic imaging and optical imaging, e.g. used in radio- and fluorescence-guided tumour resection.