Poly(1-halogen-2-phenylacetylenes) containing tetraphenylethene units: polymer synthesis, unique emission behaviours and application in explosive detection

Abstract

Pd-based catalysts have shown high activity in the polymerization of 1-chloro-2-phenylacetylene monomers in mild condition, but it is still a challenge to find synthetic routes to the polymers with high...

Activated Internal Alkyne‐Based Polymerization†

“…On account of the appealing merits, these PAs are promising candidates for fluorescent sensors and probes to chemicals and external stimuli, as well as chiral transfer and circularly polarized luminescence materials (Scheme 5b). [ 63‐70 ]…”

Commercially available palladium salts as practical and green single-component catalysts in the coordination polymerization of 1-chloro-2-phenylacetylenes in air

“…Recently, a limited number of weakly oxyphilic late-transition-metal catalysts based on palladium (Pd) have been reported as effective catalysts for the coordination polymerization of CPAs having both nonpolar and polar substituents (Scheme 1b). 26–33 In these catalysts, the chelating ligands have evolved from monophosphine, monodentate NHC, o -dimethylbenzylamine, and α-diimine ligands to tridentate ( s , s )-bis(oxazolinyphenyl) ligands. In the presence of a cocatalyst, such as AgOTf or NaBAF, these Pd catalysts show moderate activities of less than 1.5 × 10 4 g mol Pd −1 h −1 during polymerization at high temperatures.…”

“…The resulting PCPAs are partly soluble or soluble in commonly used organic solvents and they show mainly cis -selectivity and high crystallinity. 33,34 However, these known Pd catalysts still possess some shortcomings and deficiencies, such as being high cost, requiring complicated synthesis, needing a cocatalyst and high polymerization temperatures, being sensitive to air, etc . Developing practical and green metal catalysts for the coordination polymerization of CPAs is a goal that researchers are striving to achieve.…”

“…35–40 In comparison, their application as metal catalysts in coordination polymerization has rarely been reported. 33,41,42 Herein, a new strategy for the design of metal catalysts for the coordination polymerization of monomers with large steric hindrance and low electronegativity has been put forward. A series of commercially available Pd salts is introduced for the first time as low-cost, stable, green, broad-spectrum, single-component catalysts with low sensitivity to polar monomers and polar solvents, showing moderate activities of up to 6.1 × 10 4 g mol Pd −1 h −1 during the coordination polymerization of various 1-chloro-2-phenylacetylenes containing polar functional groups in polar solvents in air under mild conditions, affording highly crystalline cis -PCPAs with moderate molecular weights and narrow-to-moderate molecular weight distributions.…”