Polyyne [3]Rotaxanes: Synthesis via Dicobalt Carbonyl Complexes and Enhanced Stability

Abstract

New strategies for synthesizing polyyne polyrotaxanes are being developed as an approach to stable carbyne "insulated molecular wires". Here we report an active metal template route to polyyne [3]rotaxanes, using dicobalt carbonyl masked alkyne equivalents. We synthesized two [3]rotaxanes, both with the same C 28 polyyne dumbbell component, one with a phenanthroline-based macrocycle and one using a 2,6-pyridyl cycloparaphenylene nanohoop. The thermal stabilities of the two rotaxanes were compared with that of the naked polyyne dumbbell in decalin at 80 °C, and the nanohoop rotaxane was found to be 4.5 times more stable.

Synthesis and investigation of a meta[6]cycloparaphenylene gold(i) N-heterocyclic carbene complex

“…The fluorescence exhibited by these smaller m[n]CPPs makes them intriguing candidates for application in organic chemistry, materials science, and life sciences. [19][20][21][22][23] In 2023, our group successfully developed a convenient synthesis strategy towards different substituted m [6]CPPs. 24 Therein, we could demonstrate that the nitrile functionality can work as a convenient handle towards functional group conversion reactions without changing the absorption and emission maxima.…”