| Autor: |
Shin-ichi Morita, Yasuhiro F Miura, Michio Sugi, Yoshiaki Hirano |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 10/1/2003, Vol. 94 Issue 7, p4368, 6p, 3 Diagrams, 4 Graphs |
| Abstrakt: |
We have studied the mobility and the orientation of the hydrocarbon chain in the Langmuir–Blodgett films of merocyanine dye (MS)–arachidic acid (C[sub 20])–n-octadecane (AL[sub 18]) with the molar mixing ratio [MS]:[C[sub 20]]:[AL[sub 18]]=1:2:x (x=0,1,2,3,4,5) by means of infrared spectroscopy. Deuterated C[sub 20] (C[sub 20]-d) and deuterated AL[sub 18] (AL[sub 18]-d) have been used to separate the infrared bands due to the hydrocarbon chain of MS. The bandwidths of CH[sub 2] antisymmetric and CH[sub 2] symmetric stretching modes decrease in the range from x=0 up to 2, indicating that the motion of the hydrocarbon chain of MS is hindered by mixing the AL[sub 18]-d molecules as the third component. From x=0 to 2, the orientation of the long axis of the MS hydrocarbon chain is found to change. The change in orientation is associated with the decrease in the mobility of the MS hydrocarbon chain. It is indicated that the J aggregate is accompanied by the thermal motion of the hydrocarbon chain of MS, and that the H aggregate is accompanied by the highly packed state of the hydrocarbon chains of MS and AL[sub 18]-d, suggesting that the aggregate formation is controlled by the state of hydrocarbon chain packing. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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