Fluorescence-Enhanced Chemosensor for Metal Cation Detection Based on Pyridine and Carbazole
摘要:
A series of donor-acceptor systems incorporating a carbazole moiety as the donating unit and pyridine moiety as the accepting unit have been designed and synthesized. The spectroscopic and electrochemical behaviors of the carbazole derivatives demonstrate that the carbazole unit interacts with the electron-accepting group through the pi-conjugated spacer, thus leading to the intramolecular charge transfer (ICT). The pyridine-substituted carbazole derivatives show significant sensing and coordinating properties toward a wide range of metal cations. Compound S2 exhibits fluorescence enhancement upon association with transition metal cations, and compound V3 shows high selectivity for Cu2+ among this series of materials. DFT calculations indicate the different association abilities of the dyes and the enhancement of ICT upon addition of the metal cations.
Cyanines as New Fluorescent Probes for DNA Detection and Two-Photon Excited Bioimaging
摘要:
A series of cyanine fluorophores based on fused aromatics as an electron donor for DNA sensing and two-photon bioimaging were synthesized, among which the carbazole-based biscyanine exhibits high sensitivity and efficiency as a fluorescent light-up probe for dsDNA, which shows selective binding toward the AT-rich regions. The synergetic effect of the bischromophoric skeleton gives a several-fold enhancement in a two-photon absorption cross-section as well as a 25- to 100-fold enhancement in two-photon excited fluorescence upon dsDNA binding.
Two-photon fluorescence probes for imaging of mitochondria and lysosomes
作者:Wanggui Yang、Pui Shan Chan、Miu Shan Chan、King Fai Li、Pik Kwan Lo、Nai Ki Mak、Kok Wai Cheah、Man Shing Wong
DOI:10.1039/c3cc41240g
日期:——
Novel biocompatible cyanines show not only a very large two-photon cross-section of up to 5130 GM at 910 nm in aqueous medium for high-contrast and -brightness two-photon fluorescence live cell imaging but also highly selective subcellular localization properties including localization of mitochondria and lysosomes.
Cyanines as New Fluorescent Probes for DNA Detection and Two-Photon Excited Bioimaging
作者:Xin Jiang Feng、Po Lam Wu、Frédéric Bolze、Heidi W. C. Leung、King Fai Li、Nai Ki Mak、Daniel W. J. Kwong、Jean-François Nicoud、Kok Wai Cheah、Man Shing Wong
DOI:10.1021/ol100474b
日期:2010.5.21
A series of cyanine fluorophores based on fused aromatics as an electron donor for DNA sensing and two-photon bioimaging were synthesized, among which the carbazole-based biscyanine exhibits high sensitivity and efficiency as a fluorescent light-up probe for dsDNA, which shows selective binding toward the AT-rich regions. The synergetic effect of the bischromophoric skeleton gives a several-fold enhancement in a two-photon absorption cross-section as well as a 25- to 100-fold enhancement in two-photon excited fluorescence upon dsDNA binding.
Fluorescence-Enhanced Chemosensor for Metal Cation Detection Based on Pyridine and Carbazole
作者:Xin Jiang Feng、Pin Zhan Tian、Zheng Xu、Shao Fu Chen、Man Shing Wong
DOI:10.1021/jo401808c
日期:2013.11.15
A series of donor-acceptor systems incorporating a carbazole moiety as the donating unit and pyridine moiety as the accepting unit have been designed and synthesized. The spectroscopic and electrochemical behaviors of the carbazole derivatives demonstrate that the carbazole unit interacts with the electron-accepting group through the pi-conjugated spacer, thus leading to the intramolecular charge transfer (ICT). The pyridine-substituted carbazole derivatives show significant sensing and coordinating properties toward a wide range of metal cations. Compound S2 exhibits fluorescence enhancement upon association with transition metal cations, and compound V3 shows high selectivity for Cu2+ among this series of materials. DFT calculations indicate the different association abilities of the dyes and the enhancement of ICT upon addition of the metal cations.