Polybenzimidazole-Supported [Rh(cod)Cl]2 Complex: Effective Catalyst for the Polymerization of Substituted Acetylenes

Controlled and Living Polymerizations Induced with Rhodium Catalysts. A Review

“…However, this topic was not studied more in detail untill 1991 when Tabata et al 109 observed a solvent-induced crystallization (toluene was found as preferable solvent) of an amorphous, high-molecularweight cis-transoid PPA prepared with [{Rh(nbd)} 2 (µ-Cl) 2 ]. This transition was later observed for other cis-transoid polyvinylenes, too 75,90,110,111 . It was recognized that, in these crystallites, macromolecules adopting the helical conformation are hexagonally packed to regular nanostructures which they called columnar structures 73,95,96 .…”

“…19). Amorphous cis-transoid-HT-polyvinylenes are usually bright yellow or orange, while those transformed into the hexagonal nanocrystalline state are typically bright red 73,75,95,96,109,111,112 . The polymer color depends on the achieved degree of microcrystallinity 95,113 .…”

Catalytic activity of a half-sandwich Ru(II)-N-heterocyclic carbene complex in the oligomerization of alkynes

“…cyclooctadiene (cod), norbornadiene (nbd)) ligands are widely used in alkyne polymerization reactions [15][16][17][18][19]. The polybenzimidazole-supported [Rh(cod)Cl] 2 catalyst has been applied to convert substituted acetylenes into readily available high molecular weight polymers without the formation of oligomer side-products [20]. In some cases the reaction conditions have dramatic effect on the polymerization process.…”

SEC/DAD and1H NMR Study of Molecular Weight and Configurational Stability of Poly(2,4-difluorophenylacetylene) and Polyphenylacetylene Prepared with Rh Catalyst

“…The 1 H NMR spectra of freshly dissolved PdFPhA and PPhA thus had features typical for spectra of PPhA and its ring substituted derivatives prepared with various Rh catalysts. [81,84,85] Sharpness and good resolution of signals testify to the high degree of microstructure uniformity of both polymers as far as concerns the regularity of linkage of monomeric units (H-T) and predominant cis configuration of the main-chain double bonds.…”