Synthesis And Characterization Of Polyynes End-Capped By Biphenyl Groups ({\Alpha},{\Omega}-Biphenylpolyynes)

TL;DR

This paper reports the synthesis of stable biphenyl-capped polyynes via a straightforward method, characterizes their spectral properties, and notes their unusually low reactivity with ozone, contributing to the understanding of their stability.

Contribution

The study introduces a simple synthesis route for biphenyl-capped polyynes and provides detailed spectral analysis supported by DFT calculations, highlighting their low ozone reactivity.

Findings

Successful synthesis of biphenyl-capped polyynes in a single step

Spectral characterization confirms their structure and stability

Low reactivity of these polyynes with ozone

Abstract

Stable polyyne chains terminated with biphenyl end groups (a,u-biphenylpolyynes) were synthesized in a single step through a simple procedure by using the Cadiot-Chodkiewicz reaction conditions. The a,ubiphenylpolyynes were separated through HPLC analysis and identified by means of their electronic absorption spectra. The a,u-biphenylpolyynes were studied by FT-IR and Raman spectroscopy and the spectral interpretation was supported with DFT calculations. A peculiarly low reactivity of a,u-biphenylpolyynes with ozone was observed.