Polydendrons and polymacrocycles with phenyleneethynylene repeating unit

Helical chirality in dendronized polyarylacetylenes

“…Arylacetylenes are commonly polymerized using Ziegler-Natta catalysts, 40 metathesis catalysts, 41 and rhodium-based 1,2-insertion polymerization catalysts. [13][14][15][16][17][42][43][44][50][51][52][53][54][55][56][57][58][59] Rhodium-based catalysts are stereospecific for cis-transoidal polymers and highly tolerant of functional groups. 56 Furthermore, Noyori and co-workers have developed a rhodium-based catalyst for living polymerization of arylacetylenes.…”

“…[13][14][15][16][17] Where possible we include relevant discussion of other examples of dendronized polyarylacetylenes. 31,[50][51][52][53][54][55] We will discuss the synthesis, structural and retrostructural analysis of self-organizable dendronized polyarylacetylenes. We have identified helical order within these polymers and generalized the helical conformation found here for other polymers dendronized with selfassembling dendrons.…”

Phenylacetylene Dendrimers Containing a Fluorene Core: Synthesis and Spectroscopic Studies

“…Among these dendrimers, stiff dendritic macromolecules with antennas, such as poly(phenyletylene) dendrimers, 1 were the ideal photon-harvesting systems 2-5 with great energy transfer efficiency and 'shape-persistent' dendrimers [6][7][8][9] which have potential applications in fabricating OLEDs, 10,11 sensors, 12,13 catalysis 14 and membranes. [15][16][17] Compared with dendrimers, linear-chain macromolecules may not have the most ideal architecture in the design of artificial photon-harvesting systems for efficient energy transfer. Firstly, it is difficult to make polymeric systems with an energy gradient so that there can be a vectorial transduction of excitation energy.…”

Phenyleneethynylene Macrocycle‐Fused Phenylacetylene Monomers: Synthesis and Polymerization

“…[1] On the other hand, poly(phenylacetylene)s -the monomers of which are the same as the repeating units of phenyleneethynylene macrocycleshave attracted attention as one of the interesting functional polymers with magnetic properties, and because of their gas-or enantio-selective permeability membrane properties, and so on. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] The rhodium catalyst can selectively polymerize monosubstituted acetylenes to yield the corresponding polyacetylenes with high degrees of polymerization and stereoregularities, that is, cis-transoidal and helical structures, [16][17][18][19][20][21][22][23][24][25][26][27] while Mo and W catalysts polymerize not only mono-but also disubstituted acetylenes. [28] We previously reported that we succeeded in the polymerization of phenylacetylene monomers with very bulky dendritic side-chains constructed of the phenyleneethynylene repeating units to yield the corresponding poly(phenylacetylene)s with extraordinarily high degrees of polymerization.…”