494826-73-2Relevant academic research and scientific papers
Synthesis and spectroscopic properties of 4-amino-1,8-naphthalimide derivatives involving the carboxylic group: A new molecular probe for ZnO nanoparticles with unusual fluorescence features
Bekere, Laura,Gachet, David,Lokshin, Vladimir,Marine, Wladimir,Khodorkovsky, Vladimir
, p. 1311 - 1318 (2013/08/23)
Of a series of 4-substituted 1,8-naphthalimides, fluorescent 4-(6-piperidinyl-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)benzoic acid (4) was found to be a sensitive molecular probe for ZnO nanoparticles. We investigated in detail one- and two-photon absorption properties of this fluorophore. In nonpolar solvents, the acid 4 absorbs at about 400 nm and fluoresces at 500 nm with a fluorescence lifetime of about 7 ns, similar to the ester 6 and typical of the lifetimes of other derivatives of this type. Although the anionic form of this acid is not fluorescent, partial ionization of 4 in polar solvents, such as ethanol and acetonitrile, is not only accompanied by the expected decrease in the fluorescence quantum yield, but also gives rise to bathochromic shifts of both absorption and fluorescence and dual fluorescence with lifetimes of 0.2-0.3 ns and 6 ns ascribed to the formation of anionic complexes. The interaction with the ZnO surface brings about further considerable changes in the fluorescence patterns.
Pyrene-naftylamide bifluorophore for spectra-converting media
Adadurov, Alexander F.,Gurkalenko, Yurii A.,Zhmurin, Piotr N.
experimental part, p. 315 - 320 (2011/10/18)
New bifluorophore containing pyrene as an excitation energy donor and naphtylamide as an acceptor is synthesized and its optical properties are studied. It is founded that excitation spectrum of the bifluorophore is almost the sum of its constituents-pyrene and naftylamide. At the same time, in the luminescence spectrum there only the peak of acceptor luminescence is observed, which indicates the effective radiationless energy transfer from the donor to the acceptor. This is also proved by time resolved measurements of bifluorophore decay. The decay rate was calculated from decay curve and appear to be 0.25 hc-1. The same value obtained from the Foerster's theory is almost by an order as high. It indicates that Foerster's does not applicable in this particular case. Instead, we have to use the electron excitation density functions approach.
