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1
Characteristic Fluorescence Response of (6-Hydroxy-2-naphthyl)ethenyl Pyridinium Dyes with Bovine Serum Albumin

최명석,Ankush Gupta,서정화,S. Velmathi,James N. Wilson,Jong S. Park 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.1
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In this study, we report the efficient identification of proteins using (6-hydroxy-2-naphthyl)ethenyl pyridinium dyes (HNEPs). These dyes exhibited characteristic fluorescence responses, showing enhanced fluorescence with a red shift in the case of bovine serum albumin. The nature of the interaction between the dye and the protein was examined using a combination of various spectroscopic techniques. A time-dependent density functional theory analysis supported the strong environment-dependent fluorescence emission properties of the dyes. The current investigation clearly demonstrates that a selective optical response HNEPs can find potential usefulness as bio-sensing probes.
2
Simultaneous Sensing of Aqueous Anions and Toxic Metal Ions by Simple Dithiosemicarbazones and Bioimaging of Living Cells

Suganya, Sivalingam,Zo, Hye Jin,Park, Jong S.,Velmathi, Sivan American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.23
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New thiophene (TSC-1) and bipyridine (TSC-2) anchored thiosemicarbazones were synthesized for the recognition of biologically active and toxic analyte. Both the receptors TSC-1 and TSC-2 commonly exhibited strong sensitivity toward anions such as F–, AcO–, and CN– ions over other anions, whereas TSC-1 and TSC-2 recognized Cd2+ and Hg2+ ions, respectively. Both anion and cation recognition were clearly differentiated from colorimetric, absorption, and emission responses. A significant shift with remarkable fluorescence enhancement at 540 nm was observed for TSC-1-Cd2+, which describes an internal charge transfer (ICT) mechanism. In contrast, anion complexes of TSC-1 show fluorescence enhancement at 570 nm. TSC-2 acts as a photoinduced electron transfer (PET) sensor during both anion and cation sensing accompanied by fluorescence quenching. Furthermore, TSC-1/2 preferentially recognizes cations in the presence of competitive anions. Interestingly, selective detection of the CN– ion using the Hg2+-TSC-2 ensemble also achieved through a relay recognition method. Job’s plot analysis reveals that TSC-1/2 binds with the selective anions in 2:1 mode, and 1:1 mode was determined for Cd2+-TSC-1 and Hg2+-TSC-2, respectively. TSC-1 can be utilized for practical applications such as the recognition of targeted F– ions in daily used household toothpaste, and Cd2+ ion detection was achieved in living cells using bioimaging.Graphic Abstract <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2014/iecred.2014.53.issue-23/ie500737b/production/images/medium/ie-2014-00737b_0016.gif'><A href='http://pubs.acs.org/doi/suppl/10.1021/ie500737b'>ACS Electronic Supporting Info</A>
3
A new perylenediimide with NH functionality as a colorimetric and fluorescent probe for the selective detection of trivalent Fe3+ and Al3+ ions

Suganya, Sivalingam,Namgoong, Jin Woong,Mutyala, Anil Kumar,Velmathi, Sivan,Kim, Jae Pil,Park, Jong S. Elsevier Sequoia 2017 Journal of photochemistry and photobiology Chemist Vol. No.
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Abstract We report the synthesis of a new colorimetric probe R1, in which the perylene tetracarboxylicdiimide fluorophore is connected with an adamantly amine unit through the NH binding site. R1 was tested with a variety of metal ions and exhibited a significant colorimetric transition in the presence of Fe3+ and Al3+ ions. No significant changes were observed with other metal ions. Absorption measurements indicated that trivalent metal ions Fe3+/Al3+ bind with R1 and generate a stable complex. The presence of Fe3+ and Al3+ ions induces new absorption bands with shoulder peaks at 525nm and 568nm. The fluorescence intensity of R1 at 579nm was significantly increased by the addition of Fe3+or Al3+ ions. Furthermore, R1 was found to be sensitive towards these metal ions at micromolar concentrations. The stoichiometry of R1:Fe3+/Al3+ complexes were confirmed by ESI–MS analysis, and binding constants were calculated using Benesi–Hildebrand plots. The binding mode of R1 with metal ions was proposed based on optimized structure from DFT calculation. Highlights <UL> <LI> We prepare a perylenetetracarboxylicdiimide probe connected with admantane unit. </LI> <LI> The probe exhibits a colorimetric transition with Fe3+ and Al3+ ions. </LI> <LI> The probe responds sensitively at micromolar concentrations. </LI> <LI> We determine the stoichiometry and binding constant by analytical methods. </LI> </UL> Graphical abstract [DISPLAY OMISSION]

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