One-pot synthesis of four-coordinate boron(III) complexes by the ligand-promoted organic group migration between boronic acids.

Abstract:

:Multidisciplinary applications of four-coordinate boron(III) complexes make them very attractive and challenging research field in chemistry, biology and material sciences. The dual role played by boron atom in stabilising the chelate ligand and enhancing the π-conjugation makes them very useful as luminescent materials for organic electronics and photonics, and sensing and imaging probes for biomedical purposes. The conventional methods involve the use of diarylborinic acids or anhydrides and triaryl boranes, which are made from organometallic reagents. The strong nucleophilicity of these reagents limits the peripheral modifications onto the boron cores. Here, we report a metal-free one-pot synthesis of four-coordinate organoborons using boronic acids, which represents the first instance of ligand assisted organic group migration between boronic acids. A tetrahedral boron 'ate' complex capable of transferring an organic group to the adjacent sp2 boron within a boronic anhydride intermediate is proposed and preliminary mechanistic studies by MALDI-TOF and 11B NMR support this proposal. The products are available from a series of N,O-, N,N- and O,O-bidentate ligands upon a wide array of boronic acids. We anticipate that this reaction will impact the way of producing the four-coordinate organoborons, and propel a new discovery of such materials for optoelectronic and biomedical applications.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Sadu VS,Bin HR,Lee DM,Lee KI

doi

10.1038/s41598-017-00236-2

subject

Has Abstract

pub_date

2017-03-21 00:00:00

pages

242

issue

1

issn

2045-2322

pii

10.1038/s41598-017-00236-2

journal_volume

7

pub_type

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