Structural properties of mixed Langmuir-Blodgett films of EDTTTF(SC18)2 and behenic acid
Structural properties of mixed Langmuir-Blodgett films of EDTTTF(SC18)2 and behenic acid
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EDTTTF(SC18)2 和山萮酸混合 Langmuir-Blodgett 薄膜的结构特性
DOI：
10.1088/0022-3727/24/7/018
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
P. Delhaès
中科院分区：
文献类型：
--
作者：
M. Izumi;C. Dourthe;E. Dupart;S. Flandrois;J. Morand;P. Delhaès
研究了EDTTTF (SC18)2 （EDTTTF，乙二硫代二十八烷基硫代四硫代富勒烯）和乙酸（CH3(CH2)20 COOH）混合（1∶n）分子体系中中性和氧化Langmuir-Blodgett （LB）膜在空气-水界面的分子组装。在空气-水界面，通过研究EDTTTF (SC18)2在表面压力为30 mN - m-1时所占据的面积和n摩尔分数的脱酸，讨论了可能的分子组织。EDTTTF (SC18)2分子形成二聚体，随着褪黑酸含量的增加，发生单层重组。在n>或=2时，形成了包括EDTTTF (SC18)2分子在内的单分子层。x射线衍射研究集中在n=0、1和3的y型LB多层膜样品上。在整个混合（1:n）体系中，（001）反射主要观察到堆叠周期性，中性薄膜为55+or-1 AA，暴露于碘后的棕色薄膜为72+or-1 AA，热活化过程后的稳定导电紫色薄膜为46+or-1 AA。通过计算纯EDTTTF (SC18)2 LB膜和掺杂EDTTTF (SC18)2 LB膜的线性电子密度谱，定性地讨论了基于中心对称双分子层的可能分子组装。氧化过程中，EDTTTF (SC18)2分子的分子倾斜度与I3-离子的插入有关，这可以解释为EDTTTF (SC18)2层之间的堆叠周期变化很大。
Molecular assemblies were studied at the air-water interface, as were neutral and oxidized Langmuir-Blodgett (LB) films in the mixed (1: n) molecular system of EDTTTF (SC18)2 (EDTTTF, ethylenedithiodioctadecylthiotetrathiafulvalene) and behenic acid (CH3(CH2)20 COOH). At the air-water interface, a possible molecular organization was discussed from the study of the area occupied by EDTTTF (SC18)2 and n molar fraction of behenic acid at a surface pressure of 30 mN m-1. EDTTTF (SC18)2 molecules form dimers and with increasing behenic acid content, a monolayer reorganization occurs. The formation of monomolecular layers including monomer EDTTTF (SC18)2 molecules was achieved for n>or=2. X-ray diffraction studies were concentrated on samples of Y-type LB multilayered films with n=0, 1 and 3. Throughout the mixed (1:n) system, stacking periodicity was dominantly observed from (001) reflections as 55+or-1 AA for neutral films, 72+or-1 AA for a brown-coloured film after exposure to iodine, and 46+or-1 AA for the stable, conducting and purple-coloured film after a thermal activation process. Possible molecular assemblies based upon centrosymmetrical bilayers were qualitatively discussed based on the calculation of the linear electron density profiles of pure and doped EDTTTF (SC18)2 LB films. The large variation of the stacking periodicity during the oxidation process was explained by the molecular inclination of EDTTTF (SC18)2 molecule associated with the insertion of I3- ions which intercalate between EDTTTF (SC18)2 layers.