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RISS 인기검색어
- 검색키워드
- 저자 : Sivalingam Suganya (검색결과 3 건)
- 무료
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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.
<P><B>Abstract</B></P> <P>We report the synthesis of a new colorimetric probe <B>R1</B>, in which the perylene tetracarboxylicdiimide fluorophore is connected with an adamantly amine unit through the NH binding site. <B>R1</B> was tested with a variety of metal ions and exhibited a significant colorimetric transition in the presence of Fe<SUP>3+</SUP> and Al<SUP>3+</SUP> ions. No significant changes were observed with other metal ions. Absorption measurements indicated that trivalent metal ions Fe<SUP>3+</SUP>/Al<SUP>3+</SUP> bind with <B>R1</B> and generate a stable complex. The presence of Fe<SUP>3+</SUP> and Al<SUP>3+</SUP> ions induces new absorption bands with shoulder peaks at 525nm and 568nm. The fluorescence intensity of <B>R1</B> at 579nm was significantly increased by the addition of Fe<SUP>3+</SUP>or Al<SUP>3+</SUP> ions. Furthermore, <B>R1</B> was found to be sensitive towards these metal ions at micromolar concentrations. The stoichiometry of <B>R1</B>:Fe<SUP>3+</SUP>/Al<SUP>3+</SUP> complexes were confirmed by ESI–MS analysis, and binding constants were calculated using Benesi–Hildebrand plots. The binding mode of <B>R1</B> with metal ions was proposed based on optimized structure from DFT calculation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We prepare a perylenetetracarboxylicdiimide probe connected with admantane unit. </LI> <LI> The probe exhibits a colorimetric transition with Fe<SUP>3+</SUP> and Al<SUP>3+</SUP> ions. </LI> <LI> The probe responds sensitively at micromolar concentrations. </LI> <LI> We determine the stoichiometry and binding constant by analytical methods. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Suganya, Sivalingam,Zo, Hye Jin,Park, Jong S.,Velmathi, Sivan American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.23
<P>New thiophene (<B>TSC-1</B>) and bipyridine (<B>TSC-2</B>) anchored thiosemicarbazones were synthesized for the recognition of biologically active and toxic analyte. Both the receptors <B>TSC-1</B> and <B>TSC-2</B> commonly exhibited strong sensitivity toward anions such as F<SUP>–</SUP>, AcO<SUP>–</SUP>, and CN<SUP>–</SUP> ions over other anions, whereas <B>TSC-1</B> and <B>TSC-2</B> recognized Cd<SUP>2+</SUP> and Hg<SUP>2+</SUP> 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 <B>TSC-1</B>-Cd<SUP>2+</SUP>, which describes an internal charge transfer (ICT) mechanism. In contrast, anion complexes of <B>TSC-1</B> show fluorescence enhancement at 570 nm. <B>TSC-2</B> acts as a photoinduced electron transfer (PET) sensor during both anion and cation sensing accompanied by fluorescence quenching. Furthermore, <B>TSC-1/2</B> preferentially recognizes cations in the presence of competitive anions. Interestingly, selective detection of the CN<SUP>–</SUP> ion using the Hg<SUP>2+</SUP>-<B>TSC-2</B> ensemble also achieved through a relay recognition method. Job’s plot analysis reveals that <B>TSC-1/2</B> binds with the selective anions in 2:1 mode, and 1:1 mode was determined for Cd<SUP>2+</SUP>-<B>TSC-1</B> and Hg<SUP>2+</SUP>-<B>TSC-2</B>, respectively. <B>TSC-1</B> can be utilized for practical applications such as the recognition of targeted F<SUP>–</SUP> ions in daily used household toothpaste, and Cd<SUP>2+</SUP> ion detection was achieved in living cells using bioimaging.</P><P><B>Graphic Abstract</B> <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'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie500737b'>ACS Electronic Supporting Info</A></P>
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