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  • 저자

    안현철

  • 학위수여기관

    고려대학교 대학원

  • 학위구분

    국내석사

  • 학과

    화학과

  • 지도교수

  • 발행년도

    2004

  • 총페이지

    ⅱ, 52p.

  • 키워드

    이광자 금속이온 염료;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T10070451&outLink=K  

  • 초록

    Synthesis of two-photon absorption(TPA) materials is newly emerging research area and attract much attention because of their potential applications in optical power limiting, two-photon upconversion lasing, two-photon fluorescence excitation microscopy, three dimensional optical data storage, and photodynamic therapy. An important addition to such applications would be the development of two-photon sensors for biological applications. In this work, we describe a novel two-photon fluorescent probe for metal ions derived from 2,5-dicyano-1,4-bis(styryl)benzene as the chromophore and N,N-bis(2-pyrydyl)amino group as the receptor, respectively. The result of Job's plot and the appearance of isosbestic point at 350nm indicate the formation of 1:1 complex. The binding constant, expressed as log K, estimated with the extent of one-photon fluorescence quenching decreases in the order, Pb^(2+) (6.6±0.06)>Zn^(2+) (6.0±0.02)>Co^(2+) (5.0±0.03)>Ba(2+) (3.8±0.16). The maximum two photon action cross section (Φδ) of the probe was 260 GM at 780nm in toluene. It decreased dramatically to 14 GM in MeCN and decreased further to 4 GM upon addition of the excess metal ions. Although the difference in the Φδ before and after the addition of the metal ions were small, there was no problem of detecting the signals accurately. As expected, the TPF intensity decreased gradually upon addition of metal ions. Except for Zn^(2+) and Ba(2+), the binding constants calculated with the TPF are similar to those measured by OPF, i.e., Pb^(2+) (6.4±0.06)>Zn^(2+) (5.1±0.02)>Co^(2+) (5.0±0.03)>Li^(+)(4.9±0.03)>Ba(+2) (4.6±0.16). We believe that this result provides a useful design strategy for the synthesis of efficient two-photon probes and will make an important contribution to this area.


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