| POLYMERS Vol.60 No.7 |
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COVER STORY
New Development of Conjugated Polymers |
| COVER STORY: Highlight Reviews |
| Progress in Supramolecular Polymers Formed by Molecular Recognition | Takeharu HAINO |
| <Abstract>
Supramolecular chemistry has developed into an established field
where well-defined supramolecular assemblies are generated via noncovalent
interactions. This concept has been extended to cover the formation of
main-chain polymers. Self-assembly of supramolecular polymers can be
triggered by recognition-directed association between terminal groups
of a monomer. Thus, supramolecular polymers are reversible and constitutionally
dynamic materials whose properties respond to external stimuli. This
review highlights recent developments in the field of supramolecular
polymer chemistry. Keywords: Supramolecular Polymer / Supramolecular Chemistry / Self-Assembly / Molecular Recognition / Host-Guest Interaction / Non-Covalent Interaction |
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| Supramolecular Approach toward Alignment of π-Conjugated Polymers | Masayuki TAKEUCHI |
| <Abstract> Exploring
an approach to control the nanostructures of π-conjugated polymers has
been an important research target in materials science, which has led
to the creation of various functional materials with optimized π-electronic
properties. Several methods for controlling dimensionality, nanostructure,
and morphology have been achieved through chemical and physical techniques.
In addition to such methods for organizing conjugated polymers, we introduce
a supramolecular approach toward the alignment of conjugated polymers. Keywords: Conjugated Polymer / Alignment / Molecular Recognition / Supramolecular Assembly |
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| Surface Coordination Programming of π-Conjugated Metal Complex Polymers | Hiroshi NISHIHARA |
| <Abstract> π-Conjugated
metal complex polymers with unique geometrical structures and physicochemical
properties have attracted much attention for several decades. Here I
describe recent studies and future prospects on construction of π-conjugated
metal complex polymers at the solid surface based on “coordination programming”,
which is a new concept to utilize the advantages of coordination chemistry
to control the chemical bonds and arrangements of metal atoms and ions
for creation of superstructures. Keywords: Coordination Programming / Metal Complex / π-Conjugated Polymer / Electron Transfer / Redox Conduction / Surface Junction / Nanoscience |
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| Supramolecular Polymers from Carbon-Rich Compounds | Takanori FUKUSHIMA and Yohei YAMAMOTO |
| <Abstract> Carbon
nanomaterials, such as fullerenes, carbon nanotubes, and graphene, attract
considerable attention due to their huge potentials in various research
fields, in particular, electronics and optoelectronics. Many superb aspects
of carbon nanomaterials have also stimulated organic chemists to develop
their analogues by elaborate synthetic protocols. Hexabenzocoronene derivatives
that can be called “molecular graphene” are one of the representative
examples. As expected from the ｹ-stacked architecture of graphite, such
molecular graphenes tend to stack to form one-dimensional (1D) columnar
structures, which further assemble via secondary interactions, giving
rise to nanostructured materials, e.g., nanofiber and nanotube. The resulting
materials allow for anisotropic charge carrier transport through the
columns. In this article, we describe recent researches and future perspectives
on 1D assemblies composed of molecular graphenes. Keywords: Polycyclic Aromatic Hydrocarbons / Hexabenzocoronene / Fullerene / Self-Assembly / Nanostructures / Nanotube / Conducting Materials / Organic Electronics |
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| Design and Developments of Carbon Nanotube Composite Materials | Tsuyohiko FUJIGAYA and Naotoshi NAKASHIMA |
| <Abstract> Carbon
nanotubes (CNTs) are a class of conjugated polymer having an ultimate
electronic and mechanical structure. Since the discovery of the CNTs,
tremendous amount of efforts have been focused for the design and developments
of CNT materials. Here, recent topics on the design and developments
of CNT composite materials are described. Keywords: Carbon Nanotube / Conjugated Polymer / Flexible Devise / Graphene Nanoribbon / Polyfluorene / Separation / Transparent Electrode |
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| COVER STORY:Topics and Products |
| Superstructure Construction of π-Conjugated Cyclic Compounds through Weak Hydrogen Bonds | Ichiro HISAKI |
| <Abstract> To
achieve desired molecular arrangements in solid state, an understanding
and controlling of intermolecular interactions is required. In this study,
we demonstrate that weak hydrogen bonds provided by methyl ester groups,
in addition to carboxyl groups, play significant roles for the construction
of various superstructures based on dehydrobenzoannulenes derivatives. Keywords: Hydrogen Bond / CH / O Interaction / Polymorphism / Crystal Engineering / Dehydrobenzoannulene |
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| Construction of Metallosupramolecular Polymers Composed of Cyclic Spiroborate-Type Molecular Connecting Modules | Hiroshi DANJO |
| <Abstract> Cyclic
spiroborate cyclophanes were prepared as molecular connecting modules
for the construction of supramolecular polymers. These cyclophanes are
D3 symmetric and possess bowl-shaped cavities at both sides of a symmetry
plane, and effectively glue spherical cationic guest to each other to
form supramolecular chain structures in solution and solid state. Keywords: Spiroborates / Molecular Connecting Modules / Twin Bowls / Supramolecular Polymers / Heterobimetallic Supramolecular Polymers |
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| Conducting Polymer Nanoelectronics with Fibrous Structure | Takeshi SHIMOMURA and Sadaki SAMITSU |
| <Abstract> Conducting
polymers can self-assemble into a nanofibrous structure by π-π interaction
between polymer backbones. A nematic liquid crystal solvent promotes
the large-scale alignment of the nanofibers. A well-organized nanofibrous
structure of the conducting polymers yields high field-effect mobility
irrespective of alkyl side chain length, addressing the importance of
self-assembled nanostructures of polymers. Keywords: Conducting Polymer / Nanofiber / Self-Assembly / Branched Fiber / Liquid Crystal / Alignment / FET |
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| Electronic Functions of Liquid-Crystalline π-Conjugated Assemblies Based on Nanosegregation | Masahiro FUNAHASHI and Takashi KATO |
| <Abstract> We
have developed new electronic materials forming nanosegregated structures
in the liquid- crystalline (LC) phases. Liquid crystals bearing π-conjugated
and ionic moieties exhibit electrochromism in the liquid crystal phase
without electrolyte solutions. In the case of side-chain liquid-crystalline
(LC) polysiloxanes, efficient hole transport is achieved in the nanosegregated
smectic phase. Keywords: Liquid Crystal / Organic Semiconductor / Side-Chain Liquid-Crystalline Polymer / Carrier Transport / π-Conjugated System / Carrier Mobility / Time-of-Flight (TOF) Method |
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| Syntheses of Insulated Molecular Wires Directed toward Molecular Electronics | Jun TERAO |
| <Abstract> This
study demonstrates a new method of synthesizing permethylated CD-based
polyrotaxanes involving the polymerization of linked rotaxane monomers.
The insulated molecular wires obtained by this method are highly soluble
in organic solvents and have
a high covering ratio, rigidity, hole mobility, and photoluminescence
efficiency. Keywords: Insulated Molecular Wire / Cyclodextrin / Hole Mobility / Molecular Electronics |
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| Growing Polymers: A Personal Account |
| Research Encounters with Liquid Crystal Display Technology | Masanobu MIZUSAKI |
| <Abstract> I look back on my research life as a graduate student and as a researcher for the development of liquid crystal displays. Through my research life, I experienced that “hope” is the original expression which is produced by ourselves with great pains. |
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| Front-Line Polymer Science |
| Recent Development of Catalytic Selective Ethylene Trimerization and Tetramerization | Kazushi MASHIMA and Hayato TSURUGI |
| <Abstract> Selective
trimerization and tetramerization of ethylene giving 1-hexene and 1-octene,
respectively, have attracted industrial and academic interest. Recent
mechanistic studies concerning to ethylene trimerization reaction are
briefly summarized: the isolation and characterization of Cr(I)-pyrrole
complexes and some titanium complexes that catalyze selective trimerization
of ethylene, and the direct detection of metallacycle species under the
catalytic condition that confirms the metallacycle mechanism. In addition,
here we review the recent rapid development of Cr-based tetramerization
catalysts. Although a mononuclear metallacycle mechanism, which has been
confirmed for the selective ethylene trimerization, has not explained
this selective ethylene tetramerization, new bimetallic metallacycle
mechanisms have recently been proposed, leading to new chromium complexes
that show high 1-octene selectivity. Keywords: Catalysts / Ethylene / Selective Trimerization / 1-Hexene / Selective Tetramerization / 1-Octene / Oligomerization / Metallacycle Mechanism |
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