Abstract:
Herein, we report a novel lysosome targetable luminescent bioprobe derived from a europium
coordination compound, namely Eu(pfphOCH3IN)3(DDXPO) 4 [where HpfphOCH3IN = 4,4,5,5,5-
pentafluoro-3-hydroxy-1-(1-(4-methoxyphenyl)-1H-indol-3-yl)pent-2-en-1-one and DDXPO = 4,5-
bis(diphenylphosphino)-9,9-dimethylxanthene oxide]. Notably, the newly designed europium
complex exhibits significant quantum yield (Φoverall = 25 ± 3%) and 5
D0 excited state lifetime (τ =
398 ± 3 µs) values under physiological pH (7.2) conditions when excited at 405 nm. Hence the
developed europium complex has been evaluated for live cell imaging applications using mouse
pre-adipocyte cell lines (3T3L1). Colocalization studies of the designed bio-probe with commercial
Lysosome-GFP in 3T3L1 cells demonstrated the specific localization of the probe in the lysosome
with a high colocalization coefficient (A = 0.83). Most importantly, the developed bioprobe exhibits
good cell permeability, photostability and non-cytotoxicity.
