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Discrete boronate ester ladders from the dynamic covalent self-assembly of oligo(phenylene ethynylene) derivatives and phenylenebis(boronic acid)

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Abstract

Three increasingly π-conjugated covalent organic polygons have been prepared by the dynamic covalent condensation of catechol-based oligo(phenylene ethynylene) derivatives with phenylenebis(boronic acid). The assemblies represent a series of boronate ester “ladders” wherein two electron rich oligo(phenylene ethynylene) “rungs” are bridged by electron deficient aryl boronate ester “rails”, resulting in quasi-two-dimensional oligomers of increasing size. Spectroscopic and computational investigations suggest that the ladders exhibit a greater effective conjugation length than comparable oligo(phenylene ethynylene) compounds not bridged by aryl boronate esters. Different conformations, substitutions, and constitutions of boronate ester ladders are also modeled to gain further insight into their influence on π-conjugation and HOMO–LUMO gaps of isolated one-dimensional versus bridged, quasi-two-dimensional conjugated organic materials.

Graphical abstract: Discrete boronate ester ladders from the dynamic covalent self-assembly of oligo(phenylene ethynylene) derivatives and phenylenebis(boronic acid)

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Article information


Submitted
17 Jan 2020
Accepted
04 Mar 2020
First published
06 Mar 2020

Org. Chem. Front., 2020, Advance Article
Article type
Research Article

Discrete boronate ester ladders from the dynamic covalent self-assembly of oligo(phenylene ethynylene) derivatives and phenylenebis(boronic acid)

V. Drogkaris and B. H. Northrop, Org. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QO00083C

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