کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675955 | 1454111 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vibrational modes of merocyanine dyes softened upon J-aggregation of the dyes in their Langmuir-Blodgett films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
Head-to-tail molecular arrangements of J-aggregates modify not only the excited state, but also the ground state of the dye chromophore therein. To clarify such modification of the ground state, which is related with the aggregation mechanism, infrared absorption spectroscopy has been applied to J-aggregates of two alkylated merocyanine dyes, 6MeDS and DO, formed in their pure or mutually mixed Langmuir-Blodgett films. Some vibrational modes have been found to be softened upon the J-aggregation. The nature of these vibrational modes has been determined by density functional calculations. Then, it has been concluded that the J-aggregation induces an enhancement of intramolecular charge transfer both in the 6MeDS and DO cases, although these two dyes are largely different in their tendency to form J-aggregates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volumes 257â258, 5 May 2005, Pages 143-148
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volumes 257â258, 5 May 2005, Pages 143-148
نویسندگان
Keiichi Ikegami, Minbo Lan,