Fabrication and electrical properties of dendritic macromolecule thin films based on metal complexes

Jung, Sang-Burm; Kim, Chung-Kyun; Kwon, Young−Soo

doi:10.1016/s0040-6090(03)00746-6

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…During the past few years there has been a considerable interest in the use of dendrimers as surface and interface active materials. The preparation of Langmuir films from amphiphilic dendrimers or monodendrons has been investigated by several research groups. − The Langmuir technique helps to access valuable information about the behavior of dendrimers at the air−water interface. Previous publications showed possible approaches to achieve surface activity for dendritic molecules, but none of them has described Langmuir films obtained from codendrimers.…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystal Codendrimers with a Statistical Distribution of Phenolic and Mesogenic Groups: Behavior as Langmuir and Langmuir−Blodgett Films

et al. 2008

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The first series of carbosilane liquid crystal codendrimers with groups of different polarity has been synthesized. The chemical structure of the newly synthesized materials and the composition of the codendrimers were studied by NMR spectroscopy and MALDI-TOF MS. It was found that the codendrimers tend to form stable Langmuir films at the air-water surface. The influence of composition and generation number on surface pressure-surface area isotherms and film stability was studied. Brewster angle microscopy confirmed the different phase behavior for monolayers of different codendrimer composition and generation number. It was found that side groups of fifth-generation codendrimers do not segregate, unlike those of lower generations. Langmuir-Blodgett films on solid substrates were obtained by the vertical dipping method. X-ray diffraction showed that the codendrimers with 75% of hydrophobic mesogenic terminal groups formed ordered layers parallel to the substrate.

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Section: Introductionmentioning

confidence: 99%

Liquid Crystal Codendrimers with a Statistical Distribution of Phenolic and Mesogenic Groups: Behavior as Langmuir and Langmuir−Blodgett Films

et al. 2008

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“…The preparation of Langmuir films from amphiphilic dendrimers or monodendrons has been investigated by several research groups [17–21], since the Langmuir technique helps to access valuable information about the behavior of dendrimers at the air-water interface. Previous publications showed possible approaches to achieve surface activity for dendritic molecules, but few of them have described Langmuir films obtained from dendritic molecules [22–25] and their application.…”

Section: Introductionmentioning

confidence: 99%

Langmuir-Blodgett Films of Supported Polyester Dendrimers

Redón

Carreón-Castro

Mendoza-Martínez

2012

ISRN Organic Chemistry

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Amphiphiles with a dendritic structure are attractive materials as they combine the features of dendrimers with the self-assembling properties and interfacial behavior of water-air affinities. We have synthesized three generations of polyester dendrimers and studied their interfacial properties on the Langmuir films. The behavior obtained was, as a rule, the lowest generation dendrimers behaving like traditional amphiphiles and the larger molecules presenting complicated isotherms. The Langmuir films of these compounds have been characterized by their surface pressure versus molecular area (π/A) and Brewster angle microscopy (BAM) observations.

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“…Common micelle forming surfactants form classical lamellar monolayers with distinct orientation of each surfactant molecule in the monolayer, 4 whereas for dendrimers this rearrangement is joined with conforma tional strains. [5][6][7][8][9][10][11][12] From this point of view, investiga tion of the compression of monolayers of amphiphilic dendrimers with different molecular parameters can pro vide very important information on the relationship be tween the molecular structure of the dendrimers and con formational flexibility of their molecules upon a change in the external conditions. To obtain information of this kind, one need representative series of studied objects in which these or other structural factors are varied gradually in order to reveal certain tendencies and monitor their development.…”

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confidence: 99%

Trimethylsilyl ethers of amphiphilic carbosilane dendrimers of the third–fifths generations. Specific features of hydrolysis at the water-air interface

et al. 2007

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Carbosilane dendrimers from the third to fifth generation with hydroxy groups in the surface layer of the dendrimer were synthesized, as well as their analogs with latent hydroxy groups. The dendrimers differ by the density of the carbosilane core and hydrophilic shell. The amphiphilic nature of the synthesized compounds was manifested already for more hydro phobic trimethylsilyl derivatives of dendrimers. This allowed one to observe the hydrolysis of these objects during compression of their monolayers at the water surface in the Langmuir bath. The parameters of the molecular structure of the dendrimers exert a determining effect on the rate and completeness of the hydrolysis.Amphiphilic dendrimers are stable monomolecular mi celles, unlike multimolecular micelles, which are formed by linear amphiphilic systems. 1-3 This specific feature of molecular organization assumes a basically different be havior of amphiphilic dendrimers at the water-air inter face. Common micelle forming surfactants form classical lamellar monolayers with distinct orientation of each surfactant molecule in the monolayer, 4 whereas for dendrimers this rearrangement is joined with conforma tional strains. 5-12 From this point of view, investiga tion of the compression of monolayers of amphiphilic dendrimers with different molecular parameters can pro vide very important information on the relationship be tween the molecular structure of the dendrimers and con formational flexibility of their molecules upon a change in the external conditions. To obtain information of this kind, one need representative series of studied objects in which these or other structural factors are varied gradually in order to reveal certain tendencies and monitor their development.We have earlier 13 synthesized a series of amphiphilic dendrimers of the fifth generation with different densities of the molecular structure of the hydrophobic core of the dendrimer and hydrophilic shell. The purpose of the present work is to synthesize representative series of amphiphilic carbosilane dendrimers of the third-fifth generations with different ratios of the hydrophobic and hydrophilic parts of the molecular structure as the tri methylsiloxy derivatives and to study the hydrolysis pro cess in the monomolecular layers at the water-air in terface. Results and DiscussionSynthesis. Polyallyl carbosilane dendrimers with dif ferent densities of the molecular structure were used as A (hereinafter )

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Fabrication and electrical properties of dendritic macromolecule thin films based on metal complexes

Cited by 8 publications

References 9 publications

Liquid Crystal Codendrimers with a Statistical Distribution of Phenolic and Mesogenic Groups: Behavior as Langmuir and Langmuir−Blodgett Films

Liquid Crystal Codendrimers with a Statistical Distribution of Phenolic and Mesogenic Groups: Behavior as Langmuir and Langmuir−Blodgett Films

Langmuir-Blodgett Films of Supported Polyester Dendrimers

Trimethylsilyl ethers of amphiphilic carbosilane dendrimers of the third–fifths generations. Specific features of hydrolysis at the water-air interface

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