Photophysical Properties of Silyl‐Substituted Stilbene Derivatives
作者:Hajime Maeda、Ryo Horikoshi、Minoru Yamaji、Taniyuki Furuyama、Masahito Segi
DOI:10.1002/ejoc.202000397
日期:2020.6.23
Absorption and fluorescenceproperties of silyl‐substituted stilbenes were investigated. The derivative in which four Me3Si groups were introduced at the ortho positions did not fluoresce at room temperature. The para bis‐Me3SiC≡C‐substituted analog has a high fluorescence quantum yield (0.95). The stilbene containing Ph2N and Me3SiC≡C groups exhibited solvatofluorochromism while maintaining a good
Spectroscopic Correlations between Supermolecules and Molecules. Anatomy of the Ion-Modulated Electronic Properties of the Nitrogen Donor in Monoazacrown-Derived Intrinsic Fluoroionophores
The synthesis, absorption and emission spectra, fluorescence quantum yields, and fluorescence lifetimes of three compound series of trans-4,4'-disubstituted aminostilbenes (1-3) are reported. The chromo-/fluoroionophoric behavior of the monoaza-15-crown-5- (A15C5) and monoaza-18-crown-6 (A18C6)-derived species (1A(5)-3A(5) and 1A(6)-3A(6)) in acetonitrile and dichloromethane are also investigated. Great similarities in electronic spectroscopic properties (chemical shifts, wavelength, intensity, and lifetime) between the metal ion-complexed supermolecules and the corresponding chloro-substituted molecules have been observed: namely, 1A(5)/Ca2+-3A(5)/Ca2+ similar to 1A(6)/Ba2+-3A(6)/ Ba(2+)similar to 1C-3C in acetonitrile and 1A(5)/Na+-2A(5)/Na+ similar to 1A(6)/K+-2A(6)/K+ similar to 1C-2C in dichloromethane. Such spectroscopic correlations allow us to define the metal ion-modulated electronic character of the azacrown nitrogen atom in the ground and excited states and, in turn, to gain insights into the observed fluoroionophoric behavior of these probes in terms of the size and direction of fluorescence shifts and intensity variations.