Solitons emerge as non-perturbative solutions of non-linear wave equations in classical and quantun theories. These are non-dispersive and localised packets of energy-remarkable properties for solutions of non-linear differential equations. In presence of such objects, the solutions of Dirac equation lead to the curious phenomenon of ‘fractional fermion number’, a number which under normal cond...

Polyacetylene vesicle has attracted attentions due to its unique chromatic properties, such as blue-to-red transition. The liposome-like vesicle was immobilized on solid substrates to detect small quantity analytes. In this case, fluorescence was used for detection. We successfully detected protein and bacteria using antibodies or aptamers on the vesicles as probes. Recently, we developed a dif...

A new polyacetylene derivative with electroactive thiophene substituent, namely poly(2-methylbut-2-enyl thiophene-3-carboxylate) was synthesized and characterized. For this purpose, novel acetylene monomer was synthesized by the reaction of 3-thiophenecarboxylic acid with propargyl bromide and polymerized with a Rh catalyst to give the corresponding polymer. The chemical structure of the polyme...

Magnetic hardening and generation of room-temperature ferromagnetism at the interface between originally nonmagnetic transition metals and π-conjugated organics is understood to be promoted by interplay between interfacial charge transfer and relaxation-induced distortion of the metal lattice. The relative importance of the two contributions for magnetic hardening of the metal remains unquantif...

To describe a mobile defect in polyacetylene chains, Su, Schrieffer and Heeger formulated a model assuming two degenerate energy configurations that are characterized by two different topological phases. An immediate consequence was the emergence of a soliton-type edge state located at the boundary between two regions of different configurations. Besides giving first insights in the electrical ...

A continuum model of a Peierls-dimerized chain, as described generally by Brazovskii and discussed for the case of polyacetylene by Takayama, Lin-Liu and Maki (TLM), is considered. The continuum (Bogliubov-de Gennes) equations arising in this model of interacting electrons and phonons are shown to be equivalent to the static, semiclassical equations for a solvable model field theory of self-cou...

Quasi-onedimensional stereoregular polymers as for example polyacetylene are currently of considerable interest, both experimentally as well as theoretically. There are basically two different approaches for doing electronic structure calculations: One method, the so-called crystal orbital method, uses periodic boundary conditions and is essentially based on concepts of solid state theory. The ...

Poly(propargyl pyridinium bromide), a kind of conjugated polyelectrolyte with polyacetylene as the backbone and pyridinium as side groups, was synthesized simply via reaction between pyridine and propargyl bromide under mild conditions. The resultant polymer was characterized by (1)H NMR, elemental analysis, FT-IR, and GPC-MALLS. An alkyne group was confirmed as the end group of the polymer cha...