6307-05-7Relevant academic research and scientific papers
NIR optical carbon dioxide sensors based on highly photostable dihydroxy-aza-BODIPY dyes
Schutting, Susanne,Jokic, Tijana,Strobl, Martin,Borisov, Sergey M.,Beer, Dirk De,Klimant, Ingo
, p. 5474 - 5483 (2015/06/08)
A new class of pH-sensitive indicator dyes for optical carbon dioxide sensors based on di-OH-aza-BODIPYs is presented. These colorimetric indicators show absorption maxima in the near infrared range (λmax 670-700 nm for the neutral form, λmax 725-760 nm for the mono-anionic form, λmax 785-830 nm for the di-anionic form), high molar absorption coefficients of up to 77 000 M-1 cm-1 and unmatched photostability. Depending on the electron-withdrawing or electron-donating effect of the substituents the pKa values are tunable (8.7-10.7). Therefore, optical carbon dioxide sensors based on the presented dyes cover diverse dynamic ranges (0.007-2 kPa; 0.18-20 kPa and 0.2-100 kPa), which enables different applications varying from marine science and environmental monitoring to food packaging. The sensors are outstandingly photostable in the absence and presence of carbon dioxide and can be read out via absorption or via the luminescence-based ratiometric scheme using the absorption-modulated inner-filter effect. Monitoring of the carbon dioxide production/consumption of a Hebe plant is demonstrated.
A new and direct synthesis of chalcones via TFAA-H3PO 4 mediated c-c bond forming reaction
Kankanala, Kavitha,Reddy, Lingam Venkata,Reddy, Vangala Ranga,Mukkantia, Khagga,Pal, Sarbani
experimental part, p. 53 - 59 (2012/04/18)
A number of α,β-unsaturated carboxylic acids were reacted with electron rich arenes or heteroarene in the presence of trifluoroacetic anhydride (TFAA) and H3PO4 at room temperature to give a variety of chalcone derivatives in good to
Ferrocenyl chalcones versus organic chalcones: A comparative study of their nematocidal activity
Attar, Saeed,O'Brien, Zachary,Alhaddad, Hasan,Golden, Melissa L.,Calderón-Urrea, Alejandro
supporting information; experimental part, p. 2055 - 2073 (2011/04/27)
A series of 30 organic chlacones and 33 ferrocenyl (Fc) chalcones were synthesized and characterized by melting point, elemental analysis, spectroscopy (1H NMR and FTIR) and, in two cases, by X-ray crystallography. The biological activity of each compound (10-4 M in DMSO) against the model nematode Caenorhabditis elegans was examined in terms of % mortality (percent nematodes that died) and % fecundity (percent nematodes that reproduced) and compared to that obtained for the control medium (1% DMSO) over a 14-day period. Detailed conformational analyses for two Fc-chalcones (studied also by X-ray crystallography) were performed via molecular modeling studies. In general, the organic chalcones were found to be less polar than their Fc analogs. Some structure-activity relationships (SARs) were determined: (a) The nematocidal activities of the organic chalcones in this series were found to be much greater than those of their ferrocenyl analogs. (b) The position of the carbonyl group played a central role in the biological activity of both classes of chalcones studied. (c) For both classes of chalcones, lipophilicity of a compound seemed to play a significant role in its nematocidal activity. (d) The planarity of a ferrocenyl-chlacone seems to play a role in its activity.
