阳离子染料在粘土矿物层存在和不存在下的Langmuir-Blodgett单分子膜：N，N '-双十八烷基硫代花青、十八烷基罗丹明B和Laponite
Langmuir-Blodgett Monolayers of Cationic Dyes in the Presence and Absence of Clay Mineral Layers: N,N'-Dioctadecyl Thiacyanine, Octadecyl Rhodamine B and Laponite
摘要：
用表面压-面积等温线、紫外-可见光谱和荧光光谱研究了N，N '-双十八烷基硫菁高氯酸盐（NK）和十八烷基罗丹明B氯化物（RhB_（18））及其混合物在粘土矿物层存在和不存在下的LB膜。NK，RhB 18及其混合物的等温线是液体膨胀态行为的特征，两种阳离子染料之间具有排斥作用。在锂皂石的存在下，等温线显示液体膨胀和凝聚态行为。在合成锂皂石分散体和单层中，NK具有强烈的聚集倾向，形成H-和J-聚集体。膜中单体的吸收和荧光最大值在435 nm和480 nm处; H-二聚体在410 nm附近具有最大吸收，并且不发荧光。J-二聚体存在于所有的膜中，在461 nm处具有最大吸收，在463 nm处具有荧光。RhB 18主要以单体形式存在于LB膜中，其最大吸收波长为576 nm，荧光波长为595 nm。荧光共振能量转移从NK到RhB 18已被观察到在粘土分散体和在电影中有和没有锂皂石。在90 mol% NK + 10 mol% RhB 18的复合膜中，NK/RhB 18荧光能量转移的最佳条件为：90 mol% NK + 10 mol% RhB 18。
英文摘要：
Langmuir-Blodgett (LB) films of N,N'-dioctadecyl thiacyanine perchlorate (NK) and octadecyl rhodamine B chloride (RhB18) and their mixtures in the presence and absence of clay mineral layers were investigated by recording surface pressure - area isotherms and by UV-Vis and fluorescence spectroscopies. The isotherms of NK, RhB18 and their mixtures are characteristic for liquid expanded state behaviour with repulsive interactions between the two cationic dyes. In the presence of laponite the isotherms show liquid expanded and condensed state behaviour. In laponite dispersions and in monolayers, NK has a strong tendency to aggregate with formation of H- and J- aggregates. The absorption and fluorescence maxima of the monomers in the films are at 435 nm and at 480 nm; H-dimer have an absorption maximum around 410 nm and do not fluoresce. J-dimers are present in all the films with absorption maximum at 461 nm and fluorescence at 463 nm. RhB18 is mainly present as monomers in the LB films with an absorption maximum at 576 nm and fluorescence at 595 nm. Fluorescence resonance energy transfer from NK to RhB18 has been observed in clay dispersions and in films with and without laponite. The optimum condition for NK RhB18 fluorescence energy transfer in the films is 90 mol% NK + 10 mol% RhB18.
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