منابع مشابه
Improved Temporal Stability of Polymethine Laser Dyes in Aqueous Solutions
Polymethine laser dyes which fluoresce in the near infrared in organic solvents generally exhibit poor temporal stability at room temperature. Two typical laser-pumped polymethine dyes in aqueous solutions containing nonionic surfactants are investigated. Temporal stability was improved 20-fold, as compared to organic solutions, with no significant changes in laser-pumping threshold or tuning r...
متن کاملEfficient two-photon absorbing acceptor-pi-acceptor polymethine dyes.
We present an experimental and theoretical investigation of the linear and nonlinear optical properties of a series of acceptor-pi-acceptor symmetrical anionic polymethine dyes with diethylamino-coumarin-dioxaborine terminal groups and different conjugation lengths. Two-photon absorption (2PA) cross sections (delta(2PA)) are enhanced with an increase of pi-conjugation length in the investigated...
متن کاملEvaluation of Polymethine Dyes as Potential Probes for Near Infrared Fluorescence Imaging of Tumors: Part - 1
Near-infrared (NIR) organic dyes have become important for many biomedical applications, including in vivo optical imaging. Conjugation of NIR fluorescent dyes to photosensitizing molecules (photosensitizers) holds strong potential for NIR fluorescence image guided photodynamic therapy (PDT) of cancer. Therefore, we were interested in investigating the photophysical properties, in vivo tumor-af...
متن کاملAn Investigation of Autoxidation and DNA Thermal Cleavage by Polymethine Cyanine Dyes and Analogs in Aqueous Solutions
Studies on a series of polymethine cyanine dyes and analogs (1-24) show that certain near-infrared cyanines are capable of damaging DNA in the absence of light and external reducing agents. Experimental results imply that in this DNA thermal cleavage, the cyanine reduces Cu(II) to Cu(I) which reacts with O2 to generate the reactive oxygen species (ROS) O2 ∙and ∙OH. The formation of these ROS is...
متن کاملSmall energy gaps for certain twisted conformations ofS 0 – S 1 unsymmetric polymethine dyes : quantum chemical treatment and spectroscopic manifestations
The AM1ÈCI (Austin model 1 conÐguration interaction) method has been used to calculate energy gaps between the ground state and the lowest biradicaloid (BR) excited state as a measure for roughly (S 0) estimating the probability of reaching an conical intersection by bond twisting of one of the bonds S 0 ÈBR along the polymethine chain of unsymmetric cyanine dyes. Invoking qualitative concepts ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Chemical Communications
سال: 2020
ISSN: 1359-7345,1364-548X
DOI: 10.1039/c9cc09671j