Chemistry Letters, Vol.32, No.9, 804-805, 2003
Red luminescent squarylium dyes for noncovalent HSA labeling
Asymmetric squarylium fluorophores with 618-680 nm emissions exhibit significantly enhanced fluorescence and increased quantum yield (maximum 97%) by the formation of 1:1 dye-protein complexes when bound as non-covalent labeling probes to human serum albumin (HSA).