2156-29-8Relevant articles and documents
A stimuli-responsive supramolecular assembly between inverted cucurbit[7]uril and hemicyanine dye
Gao, Zhong-Zheng,Kan, Jinglan,Tao, Zhu,Bian, Bing,Xiao, Xin
, p. 15420 - 15426 (2018/09/29)
The effect of inverted curcurbit[7]uril (iQ[7]) on the binding mode of 2-(4-(dimethylamino)styryl)-1-methylpyridinium (DASPMI) was determined in this study. A large fluorescence enhancement of DASPMI was realized by the formation of an inclusion complex with iQ[7]. A 1:1 inclusion complex was determined through UV absorption and fluorescence spectroscopies, 1H nuclear magnetic resonance (NMR) spectroscopy, matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS), and isothermal titration calorimetry (ITC) at different pH values. In addition, we also devised a method for the controlled release of DASPMI from the iQ[7] macrocycle by adding α,α′-diamino-p-xylene.
Intramolecular charge transfer of push-pull pyridinium salts in the singlet manifold
Carlotti, Benedetta,Consiglio, Giuseppe,Elisei, Fausto,Fortuna, Cosimo G.,Mazzucato, Ugo,Spalletti, Anna
, p. 3580 - 3592 (2014/06/09)
The solvent effect on the photophysical and photochemical properties of the iodides of three trans (E) isomers of 2-D-vinyl,1-methylpyridinium, where D is a donor group (4-dimethylaminophenyl, 3,4,5-trimethoxyphenyl and 1-pyrenyl), was studied by stationary and transient absorption techniques. The results obtained allowed the negative solvatochromism and relaxation pathways of the excited states in the singlet manifold to be reasonably interpreted. Resorting to ultrafast absorption techniques and DFT calculations allowed information on the excited state dynamics and the role of the solvent-controlled intramolecular charge transfer (ICT) processes to be obtained. The structure-dependent excited state dynamics in nonpolar solvents, where the ICT is slower than solvent rearrangement, and in polar solvents, where an opposite situation is operative, was thus explained. The push-pull character of the three compounds, particularly the anilino-derivative, suggests their potential application in optoelectronics.
Synthesis, structure and in vitro antibacterial activities of new hybrid disinfectants quaternary ammonium compounds: Pyridinium and quinolinium stilbene benzenesulfonates
Chanawanno, Kullapa,Chantrapromma, Suchada,Anantapong, Theerasak,Kanjana-Opas, Akkharawit,Fun, Hoong-Kun
experimental part, p. 4199 - 4208 (2010/09/16)
The series of pyridinium (1-10) and quinolinium (11-20) stilbene benzenesulfonates have been synthesized and their structures were investigated by UV-vis, FT-IR and 1H NMR spectroscopy. In addition, compound 5 was also determined by single crystal X-ray diffraction technique. The antibacterial activity of the synthesized compounds against both Gram-positive and Gram-negative bacteria has been determined. The quinolinium derivatives exhibited two very potent characteristic activities, namely, (i) specific activity to Methicillin-Resistant Staphylococcus aureus and (ii) with broad band spectrum activity. Compounds 11, 13 and 14 are the most active showing broad spectrum antibacterial activity against Gram-positive (Methicillin-Resistant S. aureus, S. aureus, Bacillus subtilis, Vancomycin-Resistant Enterococcus faecalis and E. faecalis) and Gram-negative bacterium (Shigella sonnei). The MICs of these compounds were found to be better than that of Benzalkonium chloride (BZK), the commercially used disinfectant. The new pyridinium and quinolinium stilbene benzenesulfonates have been synthesized and characterized. All compounds were evaluated for their antibacterial activity against the tested Gram-positive and Gram-negative bacteria using colorimetric assay.
