2910-76-1Relevant articles and documents
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.
Selective synthesis of 3,4-dihydrocoumarins and chalcones from substituted aryl cinnamic esters
Jeon, Jae-Ho,Yang, Deok-Mo,Jun, Jong-Gab
experimental part, p. 65 - 70 (2011/10/31)
Coumarins are ubiquitous in plant kingdom and have been used as antitumor, antifungals, anticoagulants, insecticides. Chalcones are also widespread in plant kingdom and have been known to possess diverse biological activities; antibacterial, antifungal, antitumor and anti-inflammatory, etc. As they are considered as important natural products, numerous synthetic approaches have been reported up to the present. We devise a new selective method of preparing dihydrocoumarins and chalcones from aryl cinnamates by the selection of reagents. Dihydrocoumarin derivatives were prepared selectively by using intramolecular cyclization catalyzed by p-toluene sulfonic acid. Also, chalcones were prepared by Fries-rearrangement catalyzed by TiCl4. This method can be used for preparing various coumarin & chalcone compounds.
Synthesis and cytotoxic activity of novel pyrazoline derivatives against human lung tumor cell line (A549)
Yar, Mohammad Shahar,Siddiqui, Anees Ahmad,Ali, Mohamed Ashraf,Murugan, Vedigounder,Chandrashekhar, Raghu
, p. 81 - 86 (2008/02/09)
In the present investigation, a series of 5-(-4-(substituted)phenyl)-3-(4- hydroxy-3-methylphenyl)-4,5-dihydro-1H-1-pyrazolyl-2-toluidino methane thione and 5-(substituted)phenyl-3-(4-hydroxy-3-methylphenyl)-4,5-dihydro-1H-1- pyrazolyl-2-methoxy anilino m
