1193783-83-3Relevant academic research and scientific papers
γ radiation induced self-assembly of fluorescent molecules into nanofibers: A stimuli-responsive sensing
Han, Ji-Min,Wu, Na,Wang, Brian,Wang, Chen,Xu, Miao,Yang, Xiaomei,Yang, Haori,Zang, Ling
, p. 4345 - 4351 (2015)
Low dose detection of γ radiation remains critical for radiology therapy and nuclear security. We report herein on a novel dual-band fluorescence sensor system based on a molecule, 4-(1H-phenanthro[9,10-d]imidazol-2-yl)-N,N-diphenylaniline (PI-DPA), which can be dissolved into halogenated solvents to enable expedient detection of γ radiation. The limit of detection was projected down to 0.006 Gy. Exposure to γ radiation decomposes CHCl3 into small radicals, which then combine to produce HCl. Strong interaction of HCl with the imidazole group of PI-DPA converts it into a PI-DPA-HCl adduct, which self-assembles into nanofibers, quenching the fluorescence of the pristine PI-DPA molecule, while producing new fluorescent emission at longer wavelength. Such dual-band emission response provides improved sensing reliability compared to single band response. Systematic investigations based on acid titration, 1H NMR spectral measurements and time-course SEM imaging suggest that the observed new fluorescence band is due to π-π stacking of the PI-DPA-HCl adduct, which is facilitated by the formation of hydrogen bonded cluster units. The nanofibers exhibited high and reversible photoconductivity. Combining with the sensitive fluorescence response, the photoconductive nanofibers will enable development of a multimode stimuli-responsive sensor system that is suited for small, low cost dosimetry of γ radiation with improved sensitivity and detection reliability.
Study on the synthesis and structure-effect relationship of multi-aryl imidazoles with their fluorescence properties
Tian, Mi,Wang, Chao,Wang, Ligong,Luo, Kai,Zhao, An,Guo, Cancheng
, p. 540 - 548 (2014/07/22)
In this paper, 23 multi-aryl imidazole derivatives were synthesized and identified by nuclear magnetic resonance, ultraviolet-visible and elemental analysis. At the same time, their ultraviolet-visible maximum absorption (λabmax), fluorescence emission maximum (λemmax) and quantum yields (Cyrillic capital letter eff) were measured. The relationships between the optical behaviors and structures for these compounds were assessed. The results show that the λmaxab and λmax em are red-shifted and the fluorescence Cyrillic capital letter eff are increased by the introduction of electron-withdrawing substituents and the increase in the planarity of multi-aryl imidazole molecules. The results also showed that the fluorescence quantum yields of the compounds containing two imidazole nuclei are double the corresponding mono-imidazole nucleus compounds. Copyright
Photophysical properties of phenanthro[9,10-d]imidazole-type fluorescent hosts upon inclusion of organic solvent molecules
Ooyama, Yousuke,Kumaoka, Hironori,Uwada, Kazuki,Yoshida, Katsuhira
experimental part, p. 8336 - 8343 (2009/12/26)
The crystal of phenanthro[9,10-d]imidazole-type fluorescent clathrate host (1) exhibits fluorescence enhancement behavior with a blue-shift of the emission maximum upon enclathration of organic solvent molecules such as 1-butanol and morpholine, whereas t
