Structure-matched Phthalocyanine Ion Pair as a Red-emitting Fluorescent Optical Probe for the Analysis of Sodium Dodecylbenzenesulfonate with High Specificity and Sensitivity

Development of Functional Phthalocyanine-Based Associate towards an Effective Fluorimetric Detection of Hg(II)

“…Considering these merits, AlS 4 Pc exhibits great potential as a novel red-emitting fluorescent probe. It has been used as a fluorescent probe and applied to quantitative analysis based on its distinct characteristics in previous works [ 28 , 29 , 31 , 32 ]. The fluorescence emission peak of AlS 4 Pc locates around 685 nm with two excitation bands; one in the short-wavelength region (called Soret band) and the other in the long-wavelength region (called Q band).…”

“…In this study, a phthalocyanine associate consisting of oppositely charged phthalocyanines—which are fully water-soluble and commercially available—has been constructed for fluorescent recognition of Hg(II). Tetrasulfoaluminum phthalocyanine (AlS 4 Pc) is a strong fluorescent compound emitted at the red wavelength range with good water solubility, stability, low photobleaching effect, and high fluorescence quantum yield [ 27 ], and thus its application in the field of fluorescence analysis has attracted intensive attention in recent years [ 28 , 29 , 30 , 31 , 32 ]. This study found that Alcian blue, a cationic copper phthalocyanine compound, has an efficient fluorescence quenching effect on the AlS 4 Pc to form an almost no fluorescence ion-pair associate (AlS 4 Pc-Alcian blue 8GX) in acidic or weak acidic medium, whereas the fluorescence recovered significantly in the presence of Hg(II).…”