Synthesis Of 4a-Indacene Essay

The syntheses of 8-(4-(decyloxy) phenyl)-1, 3, 5, 7-tetramethyl-2, 6 dibromo-4-bora, 3a, 4a-diaza-s-indacene and 8-(4-(decyloxy) phenyl)-1, 3, 5, 7-tetramethyl-2, 6 diiodo-4-bora, 3a, 4a-diaza-s-indacene both commence with the synthesis of 4-(decyloxy) benzaldehyde. Following standard procedures and using the resulting aldehyde, along with 2,4-dimethylpyrole, a BODIPY dye was obtained [36]. To facilitate intersystem crossing, the 2- and 6- positions of the boradiazaindacene ring system were iodinated with an iodic acid-iodine mixture [37]. Bromination at the same positions was performed via N-bromosuccinamide (NBS) [38]. 8-Palmitoyl-1, 3, 5, 7-tetramethyl-2, 6 diiodo-4-bora, 3a, 4a-diaza-s-indacene was obtained by the iodination of 8-palmitoyl-1, 3, 5,
The control experiment involved using ABMDMA with a maximum absorbance of 1 in water. The solutions were irradiated in an open quartz cuvette by continuous stirring. The absorbance measurements followed by irradiation were taken every 5 min. A 520 nm green LED lamp was used as the light source.The absorbance spectrum of ABMDMA in water showed that the absorbance stayed constant for 30 minutes (Figure 2). Figure 3 shows the absorbance changes of 9,10-anthracenediyl bis(methylene)dimalonic acid alone and M3 with 9,10-anthracenediyl bis(methylene)dimalonic acid in an aqueous solution as a function of irradiation time. No change in the absorbance occurred in the trap molecule either in light or dark, though the absorbance of the M3-trap molecule solution decreased under light due to the interaction of trap molecule with singlet oxygen at 377 nm. It is well known that photosensitizers used in PDT can be photobleached, followed by the loss of absorbance, fluorescence and photoactivity. As shown, M3 is clearly photo-stable with only a minor change in absorbance (16