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Please use this identifier to cite or link to this item:
http://hdl.handle.net/10232/266
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| Title | : | Temperature-induced Chirality Reversal of Induced Circular Dichroism of Premicellar Aggregates of Acridine Orange Derivatives and Dodecanoyl-L-threonine in Aqueous Solution |
| Authors | : | Hayakawa, Katumitu
Sato, Mayuko
Nagata, Izumi
Yamato, Naoya
Murata, Hiroshi
Tanokura, Masaru |
| Issue Date | : | 2006 |
| Abstract | : | Circular dichroism (CD) and absorption spectra were measured for acridine orange
derivatives: 3,6-bis(dimethylamino) acridine (AO), 3,6-bis(dimethylamino)-10-methylacridinium
bromide (C1AO), and 3,6-bis(dimethylamino)-10-dodecylacridinium bromide (C12AO) in aqueous
dodecanoyl-L-threonine (C12Thr) solutions at 30, 40, 50 and 60°C and pH 8-9. CD spectra were not
induced for AO and C1AO in C12Thr aqueous solutions. Induced circular dichroism (ICD) based on
the exciton interaction was found for premicellar aggregates of C12AO with C12Thr, but the micellar
aggregates failed to induce circular dichroism for solubilized C12AO at a higher concentration than
C12Thr critical micelle concentration. The maximum ICD intensity was observed for 1:1.2
aggregates of C12AO and C12Thr. The ICD spectrum indicated negative chirality at 30°C, but
positive chirality at 50°C. The chirality transition occurred at 40~45°C. The slow change in both the
absorption and ICD spectra is ascribed partly to the rearrangement of dye alignment and partly to
the growth of the aggregate; the system reaches final phase separation after a few days. |
| Type Local | : | 雑誌掲載論文 |
| ISSN | : | 0303402X |
| Publisher | : | Springer Verlag |
| URI | : | http://hdl.handle.net/10232/266 |
| Citation | : | Colloid and polymer science : official journal of the Kolloid-Gesellschaft Vol.284 p.1453 -1458 |
| Appears in Collections | : | 理学部・学術誌論文
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