Chromo- and fluorophoric water-soluble polymers and silica particles by nucleophilic substitution reaction of poly(vinyl amine)

• Katja Hofmann,
• Ingolf Kahle,
• Frank Simon and
• Stefan Spange

Beilstein J. Org. Chem. 2010, 6, No. 79, doi:10.3762/bjoc.6.79

• -dimethylcyclodextrin or by pre-adsorption onto silica particles. Furthermore, 1 was converted with isopropylamine into the model compound 1-M. All new compounds were characterized by NMR, FTIR, UV–vis and fluorescence spectroscopy. The solvent-dependent UV–vis absorption and fluorescence emission band positions of the

• possible [32]. The fluorescence emission maxima of 1-M and 1-P are shown in Table 4. Figure 5 shows an UV–vis absorption spectrum and a fluorescence emission spectrum of 1-M and 1-P measured in methanol as well as a photograph of solutions of these compounds. Similar to the UV–vis measurements, 1-M shows

• the longest-wavelength emission maximum in DMSO at λmax = 595 nm and 1-P in ethanol at λmax = 586 nm. The longest hypsochromic shifts of the fluorescence emission maximum were observed at λmax(1-M) = 577 nm in HFIP and λmax(1-P) = 561 nm in DMMA. These band shifts correspond to a small solvatochromic

Synthesis of indolo[3,2-b]carbazole-based new colorimetric receptor for anions: A unique color change for fluoride ions

• Ajit Kumar Mahapatra,
• Giridhari Hazra and
• Prithidipa Sahoo

Beilstein J. Org. Chem. 2010, 6, No. 12, doi:10.3762/bjoc.6.12

• a quenching results from a hydrogen bond interaction of phenolic OH with anions, which leads to the stabilization of the nπ* state with respect to the ππ* state and a subsequent decrease in the fluorescence emission intensity [51]. Analogous investigation of fluorescence was carried out with other

Quinoline based receptor in fluorometric discrimination of carboxylic acids

• Kumaresh Ghosh,
• Suman Adhikari,
• Asoke P. Chattopadhyay and
• Purnendu Roy Chowdhury

Beilstein J. Org. Chem. 2008, 4, No. 52, doi:10.3762/bjoc.4.52

• compounds were characterized using 1H NMR, 13C, mass, IR and UV spectroscopic methods. Interaction studies UV-vis study The sensitivity and selectivity of the receptors 1 and 2 were evaluated by observing the changes in 1H NMR, UV-vis and fluorescence emission in CHCl3. Initially, the photophysical

Synthesis of deep- cavity fluorous calix[4]arenes as molecular recognition scaffolds

• Maksim Osipov,
• Qianli Chu,
• Steven J. Geib,
• Dennis P. Curran and
• Stephen G. Weber

Beilstein J. Org. Chem. 2008, 4, No. 36, doi:10.3762/bjoc.4.36

• fluorescence emission (as observed qualitatively on TLC). An increase in fluorescence emission was observed with 7, 8, and 9 as compared to the single aryl ring analogs, and allows for better applications of the scaffold as a sensor [8][37]. Conclusion Deep-cavity functionalized fluorous calix[4]arenes that