AGGREGATION PHENOMENA IN LANGMUIR-BLODGETT-FILMS OF POLAR STILBENE AMPHIPHILES

被引:46
作者
FURMAN, I
GEIGER, HC
WHITTEN, DG
PENNER, TL
ULMAN, A
机构
[1] UNIV ROCHESTER,CTR PHOTOINDUCED CHARGE TRANSFER,ROCHESTER,NY 14627
[2] UNIV ROCHESTER,DEPT CHEM,ROCHESTER,NY 14627
[3] EASTMAN KODAK CO,IMAGING RES & ADV DEV,ROCHESTER,NY 14650
关键词
D O I
10.1021/la00015a039
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The effect of incorporating polar-substituted stilbene groups into two-dimensional molecular assemblies was studied. A homologous series of stilbene-containing hexadecanoic acids was found to exhibit H-aggregation in supported Langmuir-Blodgett (LB) monolayers. The spectral properties of these aggregates are insensitive to the particular homologue used, either alone or in 1:1 mixtures. This result, particularly when considered in the context of its extreme similarity to that obtained from the LB films formed by alkyl-substituted stilbene fatty acids, suggests that H-aggregation is a minimum free energy packing assembly for stilbene units in LB films. Beta-stilbene methylation prevents the molecules from tight packing and produces a pronounced perturbation on the H-aggregate absorbance spectrum.
引用
收藏
页码:837 / 843
页数:7
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