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Substituent‐dependent self‐assembly: Two‐dimensional aggregate formation in cyanine dye‐adsorbed Langmuir‐Blodgett films
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9.in a previous paper, we reported that restraint of adsorption in TET, which brings a decrease in o.d. in comparison with the other derivatives, was observed if we used aged solutions. However, it is found that we can obtain the sample with considerable o.d. which are comparable to the other derivatives if we use fresh solutions without aging. It should be noted that TET is unstable to light irradiation and the fact may be related to such aging effects.
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15.in Ref. 12, another brickstonelike arrangement, i.e., a brickstonelike arrangement by sandwich dimers, is proposed on the basis of x-ray diffraction data of a 3-D J-aggregate crystal. However, we did not take this model, since a sufficient red shift could not be expected for this 2-D J aggregate of the LB film from the viewpoint of the extended dipole model.
16.Sometimes, we observed other J aggregates with different absorption wavelengths in the LB film. The present J aggregate seems to show polymorphism probably due to difference in the arrangement or degree of twist including cis-trans steroisomerization of dyes are mentioned in Ref. 12.
17.M. Orrit, D. Möbius, U. Lehmann, and H. Mayer, J. Chem. Phys. 85, 4966 (1986). In this paper, they reported another H-aggregate formation in a complex LB system of a related compound of MMT and which shows a similar band split: the transition moment of the blue-shifted band is normal to the film plane, while that of the red-shifted band is parallel to it. They have dealt with these bands independently neglecting the observed orthogonality. It is noted that this orthogonality may be explained as another superstructure H aggregate by assuming an out-of-plane tilt of the long axis of the chromophore: the top view can be considered as a conventional 2-D H aggregate; the cross section is a triangular-wave-like structure which causes Davydov spitting.
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