5,10,15,20-四-(4-十六烷基吡啶基)卟啉LB膜结构的研究

研究了两亲性卟啉５,１０,１５,２０－四－（４－十六烷基吡啶基）卟啉溴化物在气－液界面上的成膜性能,制备了其ＬＢ膜。用扫描隧道显微镜和ＵＶ－Ｖｉｓ光谱,荧光光谱,小角Ｘ射线衍射等实验方法研究了ＬＢ膜的形貌和卟啉大环分子在ＬＢ膜中的排列、取向和分子间的相互作用。结果表明,制备的ＬＢ膜结构均匀,性能稳定,在ＬＢ膜内,脂肪链并不是直立的,卟啉分子大环几乎平躺在基片上。     

卟啉LB膜的分子取向,形貌和膜厚度研究

研究了５，１０，１５，２０－四（对－山嵛酸乙酯－α－氧代苯基）卟啉分子在气液罪肌的成膜性，制备了该化合物的多层ＬＢ膜，研究了分子中不同的基团在ＬＢ膜中的取向，观测了ＬＢ膜的形貌和厚度，利用偏振ＵＶ－Ｖｉｓ和偏振ＦＴ－ＩＲ谱测定了分子内卟啉环和脂链取代基的取向，结果表明卟啉面法线和脂缝线与载片线间的夹角分别为３７°和２７°，利用ＴＥＭ观测了ＬＢ膜的形貌和厚度，结果表明ＬＢ膜表面均匀，单层厚度大约为２     

卟啉和卟啉铜分子的成膜特性和UV—Vis光谱表征

合成了５，１０，１５，２０－四（对－异戊酯苯基）卟啉及其铜配合物，研究了它们在气液界面的成膜性质，制备了上述化合物的ＬＢ膜，利用ＵＶ－Ｖｉｓ光谱对化合物在ＬＢ膜结构中的取向进行了表征，研究结果表明，两种化合物在界面上的成膜性质和分子环面在ＬＢ膜结构中的取向均受到铜离子配位的影响。     

卟啉取代侧链在LB膜结构中的取向研究

本文研究了５，１０，１５，２０－四（对－山嵛酸乙酯－α－氧代苯基）卟啉在气－液界面的成膜性能。在优化实验条件下制备了该化合物的多层ＬＢ膜。利用偏振ＦＴ－ＩＲ谱测定了卟啉上脂链取代基在ＬＢ膜结构中的取向。结果表明脂链轴线与载片法线间夹角为２７°。     

四—（对—羟基苯基）卟啉在水／三氟乙酸溶液中J—聚集的光谱研究

本文研究了四－（对－羰基苯基）卟啉（ＴＣＰＰ）在Ｈ２Ｏ／ＣＦ３ＣＯＯＨ、Ｈ２Ｏ／ＣＣＩ３ＣＯＨ和Ｈ２Ｏ／ＣＨ３ＣＯＯＨ溶液中的ＵＶ－Ｖｉｓ吸收光谱、荧光光谱和拉曼光谱。实验表明,ＴＣＰＰ在Ｈ２Ｏ／ＣＨ３ＣＯＯＨ和Ｈ２Ｏ／ＣＣＩ３ＣＯＯＨ溶液中以分子态的Ｎ－质子化卟啉Ｈ８ＴＣＰＰ＾２＋存在,而在Ｈ２Ｏ／ＣＦ３ＣＯＯＨ中则形成Ｈ８ＴＣＰＰ＾２＋的Ｊ－聚集体。Ｊ－聚集体显示,ＵＶ－Ｖｉｓ吸收光谱和荧光光     

5-(2-羧基苯基)-10,15,20-三苯基卟啉-氨基酸酯之间的氢键-UV-Vis和~1H-NMR研究

本文通过分析５－（２－羧基苯基）－１０,１５,２０－三苯基卟啉（ｏ－ＴＰＰＣＯ２Ｈ）和苯丙氨酸乙酯的紫外－可见光谱（ＵＶ－Ｖｉｓ）滴定曲线以及１ Ｈ－ＮＭＲ数据, 证实了ｏ－ＴＰＰＣＯ２Ｈ 中的吡咯氮上的氢和氨基酸酯的羰基氧之间形成的氢键     

新型两亲性酞菁锌LB膜的制备及其FT—IR结构表征

本文报导了一种新型的两亲性分子－长链对称取代锌酞菁ＬＢ膜的制备和结构特点。研究了其固相和ＬＢ膜的红外光谱。用偏振－付立叶变换红外光谱研究了ＬＢ膜内长脂肪链的取向。     

5—（2—羧基苯基）—10,15,20—三苯基卟啉—氨基酸酯之间的氢？…

本文分析了５－（２－羧基苯基）－１０－,１５,２０－三苯基卟啉（ｏ－ＴＰＰＣＯ２Ｈ）和苯丙氨酸乙酯的紫外－可见光谱（ＵＶ－Ｖｉｓ）滴定曲线以及＾１Ｈ－ＮＭＲ数据,证实了ｏ－ＴＰＰＣＯ２Ｈ中的吡咯氮上的氢和氨基酸酯的羰基氧之间形成的氢键。     

1-羟基-5-十二烷氧基-萘LB膜结构和取向的光谱研究

用红外透射,反射光谱及紫外可见吸收光谱方法研究了１－羟基－５－十二烷基－萘ＬＢ膜及溶液状态下的结构,分子取向。研究结果表明分子在溶液中主要是以单体形式存在;在ＬＢ膜中是以聚集体形式存在。     

聚酰亚胺LB膜上液晶表面锚定的研究

通过测试光延迟研究了聚酰亚胺ＬＢ膜的光学各向异性，分析了在ＬＢ膜成膜过程中成膜分子的流动取向特性，并研究了液晶的表面锚定能，分析了ＬＢ膜上液晶的取向机制．聚酰亚胺ＬＢ膜的链段的取向程度较强摩擦情形的聚酰亚胺表面的链段取向要差．强摩擦的聚酰亚胺会比聚酰亚胺ＬＢ膜具有更好的排列液晶分子的能力．ＬＢ膜的流动取向模式使得聚酰亚胺成膜分子沿拉伸方向形成一定的有序排列，并诱导液晶分子定向排列，液晶和聚合物分子相互作用是液晶表面排列的主要动力 关键词：     

无长链天然卟啉的LB膜制备与光谱研究

本工作对无长链天然血卟啉(HP),原叶啉(PP)和卟啉C行进了LB膜的成膜探索,制备了单层、多层以及与硬脂酸、卵磷脂混合后的复合LB膜.对它们进行了紫外——可见吸收光谱、荧光光谱和时间分辨荧光光谱的研究,发现在LB膜中荧光寿命是一个很好的表征手段.     

Molecular Orientation and Aggregation in the Langmuir-Blodgett Films of 4-[4′-(4″-Decyloxy Phenylazo) Naphthloxy] Butyl Trimethylammonium Dextran Sulfate Studied by Ultra-Violet and Infrared Spectroscopy

Infrared transmission, Reflectance-Absorption (RA) and Ultra-Violet (UV) spectra were measured for mono-and multi-layers Langmuir-Blodgett (LB) films of 4-[4′-(4″-decyIoxy phenylazo)naphthloxy] butyl trimethylammonium bromide formed with SDS to study the molecular orientation and aggregation. The results indicate that the compound do not aggregate in the LB films, and the alkyl tail is nearly perpendicular to the substrate surface and the chromorphore part adopts trans-zigzag conformation. These results also suggest that the molecular orientation and aggregation are not depend upon the number of monolayers The comparison of infrared transmission and RA spectra indicates that the hydrocarbon chain is nearly perpendicular to the substrate surface, but the two rings in the chromophore part are tilted considerably from the surface normal.     

Langmuir and Langmuir-Blodgett (LB) films of tetrapyridyl metalloporphyrins

We report on the formation of Langmuir films of 5,10,15,20-tetra(4-pyridyl) 21H,23H-porphine, hereafter named tetrapyridyl porphyrins with distinct central ions (2H⁺, Zn²⁺, Cu²⁺, Ni²⁺). The films were characterized with surface pressure and surface potential isotherms and in situ UV-vis absorbance. The measurements indicated strong aggregation of porphyrin monomers at the air-water interface, with a red shift of the Soret band in comparison with the spectrum obtained from CHCl₃ solutions. The shift was larger for the non-substituted H₂TPyP, and depended on the metal ion. Significantly, aggregation occurred right after spreading of the Langmuir film, with no further shifts in the UV-vis spectra upon compression of the film, or even after transferring them onto solid substrates in the form of Langmuir-Blodgett (LB) films. The buildup of LB films from H₂TPyP and ZnTPyP was monitored with UV-vis spectroscopy, indicating an equal amount of material deposited in each deposition step. Using FTIR in the transmission and reflection modes, we inferred that the H₂TPyP molecules exhibit no preferential orientation in the LB films, while for ZnTPyP there is preferential orientation, with the porphyrin molecules anchored to the substrate by the lateral pyridyl groups.     

Structure and Orientation of 1-Hydroxyl-5-Hexadecyloxy-Naphthalene LB Films Studied By UV-VIS and FTIR Spectroscopy

Ultraviolet-visible (UV-Vis), infrared transmission, and reflection absorption(RA) spectra have been measured for one-and multi-monolayer Langmuir-Blodgett(LB) films of C₁₆H₃₃30Naph(1,5)OH at various temperature to investigate dependencies of the aggregation and phase transitions on the number of monolayers. The UV-vis spectra of the LB films have revealed that the C₁₆H₃₃ONaph(1,5)OH forms aggregates in the LB film. From the temperature dependence of UV-vis absorption spectra, it is clear that the aggregate is gradual converted to monomer upto 80 °C. A comparison of the infrared transmission and RA spectra reveals that the hydrocarbon chains are tilted considerably in the LB film. As for the naphthalene ring part, the result suggest that the ring plane is oriented approximately perpendicular to the substrate surface. The Temperature dependence of infrared transmission spectra have been measured for 1-, 3-, and 11-monolayer LB films to investigate dependence of phase transitions on the number of monolayers. These observations show that the one-monolayer LB films does not have a clear order-disorder transition, while the three-and eleven-monolayer films have a phase transition near 60 °C. Therefore, it seems that the title angles of both the alkyl chain and chromophore part change largely concomitantly with the conversion from the aggregate to the monolayer.     

取代基对双酞菁铥LB膜及光谱特性的影响

采用紫外-可见吸收光谱的方法研究了三种稀土夹心双酞菁铥化合物在溶液和LB膜中的聚集性和光谱特性。实验结果表明三种稀土双酞菁化合物在氯仿溶液中形成了H-聚集体,但当浓度比较低时,溶液中表现出单体的吸收。取代基OC₈H₁₇的加入使氯仿溶液中双酞菁铥化合物的聚集性减弱,而且使得吸收峰发生红移,对吸收峰的强度也有较大的影响,造成了Soret吸收带的分裂。另外,取代基OC₈H₁₇对LB膜中双酞菁分子的存在状态有较大的影响,在LB膜中,TmPc₂和TmPcPc*分子以H-聚集体的形式存在,而TmPc*₂分子以T-聚集体的形式存在。形成LB膜后,由于双酞菁分子之间排列紧密,相互作用加强,使得薄膜中分子聚集体的吸收峰相对于溶液中聚集体的吸收峰发生了一定的红移,薄膜中分子排列方向的不同对吸收光谱也有一定的影响。     

卟啉掺杂的MEH-PPV薄膜和氯仿溶液的光学性质(英文)

研究了不同质量浓度卟啉(TTP)掺杂的MEH-PPV的紫外吸收和荧光发射光谱。这种掺杂体系在膜中和氯仿溶液中的吸收光谱具有同样的行为,同时,在这两种情况下发现了MEH-PPV链的聚集,以及TTP在420nm的吸收随掺入量的增加而增加。但是,膜的发射光谱与氯仿溶液中的有所不同。因TTP的吸收带与MEH-PPV发射带的重叠,在膜和氯仿溶液中的高浓度掺杂体系中存在从MEH-PPV到TTP的Frster能量转移,但是在高TTP掺杂下的氯仿溶液中能量转移导致MEH-PPV发射峰的劈裂,而当溶液被稀释时,这种现象消失,表明此时能量给体和受体的距离扩大,这种能量转移的速率为1×108mg·mL-1·s-1。     

Ftir Studies on LB Film of Amphiphile with Schiff Base as Headgroup and Its Copper Complex

Two different ways to form monolayers and LB films (surface film and subphase film) of the complex have been used, where a novel amphiphile containing Schiff base as a headgroup was used as a ligand. the monolayer behavior at the air/water interface was characterized by π-A isotherms and two-dimensional molecular orientation of alkyl chains in LB films and thermal stability were measured by polarized and variable temperature FTIR transmission spectra, indicating that the LB film of the novel amphiphile and its copper(II) complex are very stable as well as stearic acid. Because incorporating the metal ion into the monolayer makes it more condensed, thermal stability of the LB film was enhanced. as can be compared from their structure and properties, subphase films are superior to surface films.     

Absorption Spectral Study of Mixed Chiral Amino Acid Porphyrin Langmuir-Blodgett Films

Absorption spectra were performed on Langmuir-Blodgett films of a new chiral amino acid porphyrin (Py) and its mixture with stearic acid (SA). Vertical uniformity of the LB films has been demonstrated by the linear relationship between the absorbance and the layer number of films. J-Aggregates were present when the film was transferred at various surface pressures and at different molar ratios of Py and SA. However, no aggregation was present for the molecules in the adjacent monolayers. the observed optical absorption spectra of mixed films were markedly dependent on the combination of Py. When the molar ratio of Py was increased from 0.05 to 0.75, the absorption peaks of Soret and Q bands bathochromically shifted ca. 5.5 and 2.2 nm. When the deposited pressure was increased from 5 to 35 mN/m, the absorption peaks of Soret and Q bands bathochromically shifted ca. 3.7, 3.2 nm and 3.5, 2.2 nm for pure Py and 1:3 Py-SA mixed LB films, respectively. on a hydrophobic substrate, the LB films showed a red shift of ca. 4.5 nm for Soret band compared with that on the hydrophilic substrate owing to their different environments.