Electron-Deficient Columnar Plastic Crystals

Böck, Harald; Babeau, A.; Séguy, Isabelle; Jolinat, Pascale; Destruel, P.

doi:10.1002/1439-7641(20020617)3:6<532::aid-cphc532>3.0.co;2-m

Cited by 54 publications

(29 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different azaaromatic compounds that vary in size, the smallest being the pyridine (131) and triazine (132,133) units, can give rise to columnar mesophases of different degrees of order. [295][296][297][298] Extended electron-deficient disks (134)(135)(136)(137) are based on hexaazatriphenylene [299][300][301] and quinoxaline 302-304 cores (Figure 45), having charge-carrier mobilities up to 10 -3 cm 2 /V s. 304 The potential application as electronaccepting materials in solar cell devices was demonstrated on liquid-crystalline films of 136 in the presence of a p-type polythiophene polymer by photoinduced absorption and fluorescence measurements. 301 Hydrogen bonding can be used to significantly enforce the intracolumnar stacking order.…”

Section: Thermotropic Discotic Moleculesmentioning

confidence: 99%

About Supramolecular Assemblies of π-Conjugated Systems

et al. 2005

View full text Add to dashboard Cite

Section: Thermotropic Discotic Moleculesmentioning

confidence: 99%

About Supramolecular Assemblies of π-Conjugated Systems

et al. 2005

View full text Add to dashboard Cite

“…In many cases, the aromatic cores were substituted by side chains bearing heteroatoms, which might enhance the affinity of the molecules to the surfaces and thus the tendency to form homeotropic alignment (see HBC 74). 86,[164][165][166][167][168] However, the formation of homeotropic alignment by an all-hydrocarbon HBC 75 71 (Fig. 16) and even by larger PAHs 169 indicates a more complex mechanism.…”

Section: Homeotropic Alignmentmentioning

confidence: 99%

Discotic liquid crystals: a new generation of organic semiconductors

2007

View full text Add to dashboard Cite

Discotic (disc-like) molecules typically comprising a rigid aromatic core and flexible peripheral chains have been attracting growing interest because of their fundamental importance as model systems for the study of charge and energy transport and due to the possibilities of their application in organic electronic devices. This critical review covers various aspects of recent research on discotic liquid crystals, in particular, molecular design concepts, supramolecular structure, processing into ordered thin films and fabrication of electronic devices. The chemical structure of the conjugated core of discotic molecules governs, to a large extent, their intramolecular electronic properties. Variation of the peripheral flexible chains and of the aromatic core is decisive for the tuning of self-assembly in solution and in bulk. Supramolecular organization of discotic molecules can be effectively controlled by the choice of the processing methods. In particular, approaches to obtain suitable macroscopic orientations of columnar superstructures on surfaces, that is, planar uniaxial or homeotropic alignment, are discussed together with appropriate processing techniques. Finally, an overview of charge transport in discotic materials and their application in optoelectronic devices is given.

show abstract

“…Interestingly, all showed a strong tendency to align homeotropically on the glass substrate, which may be potentially utilized for pattern applications on distinctly chemically modified surfaces ( Figure 22a-c). 61,62 Unlike 27 and 28, the crystalline phase of 29 was experimentally accessible. Interestingly, the crystalline phase maintained the two-dimensional hexagonal columnar structure similar to its LC phase, as confirmed by the small-angle X-ray scattering data (Figure 22d).…”

Section: Poly(benzyl Ether) Dendron-based Discotic Lc Materials Usingmentioning

confidence: 99%

Spontaneous bulk organization of molecular assemblers based on aliphatic polyether and/or poly(benzyl ether) dendrons

Cho

2012

Polym J

View full text Add to dashboard Cite

This paper reviews our recent research with regard to bulk self-assemblers based on well-defined branched building blocks. Branched molecules/polymers have been known to show different physical properties from conventional linear-shaped polymers. As well as thermal and solution properties, structural modification into branched building blocks also has a significant influence on self-assembling behavior in the bulk states, including solid and liquid crystalline (LC) phases. As a branched component, dendrons/dendrimers with well-defined structures can be ideal candidates for the construction of advanced self-assemblers. Recently, we worked on new assembling systems such as dendron-coils, block codendrimers and discotic LC molecules. In the design, we used aliphatic polyether dendrons in most cases and poly(benzyl ether) dendrons in part. Their bulk assembling and thermal properties were found to be distinct from conventional linear block copolymers and they were dependent upon their chain architectures. To self-assemble into ordered nanostructures, the hybrid assembers were designed to have incompatible blocks, for example, hydrophilic and hydrophobic parts. Furthermore, in some cases an ionic complexation was carried out to maximize the immiscibility between the two different blocks. This review describes the molecular manipulations to engineer the nanoassemblies in bulk and also the ionic transportation properties depending on the assembling morphology.

show abstract

Electron-Deficient Columnar Plastic Crystals

Cited by 54 publications

References 7 publications

About Supramolecular Assemblies of π-Conjugated Systems

About Supramolecular Assemblies of π-Conjugated Systems

Discotic liquid crystals: a new generation of organic semiconductors

Spontaneous bulk organization of molecular assemblers based on aliphatic polyether and/or poly(benzyl ether) dendrons

Contact Info

Product

Resources

About