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A tricarboyanine derivative (IRPP) is applied as a ratiometric near-infrared chemosensor for detecting trivalent chromium ions (Cr 3+ ) in living cells. Upon the addition of Cr 3+ to a solution of IRPP, large-scale shifts in the emission spectrum (from 755nm to 561nm) are observed. In the newly developed sensing system, these well-resolved emission peaks yield a sensing system that...
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