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12 Mar 16:19

Boron‐Based Enantiomerism

by Manfred Braun
Boron-Based Enantiomerism

Flat, tri-coordinate boron rears its had, becomes tetra-coordinate and chiral! When treated in an appropriate manner, it forms enantiomers that are configurationally stable. Only since recently, boron-stereogenic complexes are accessible by catalytic enantioselective syntheses. What makes this particularly exciting is that tetra-coordinate boron compounds are considered promising light-emitting materials.


Boron-based enantiomerism is fragile due to the inherent tendency of a dissociation of a ligand from tetra-coordinate chiral boron complexes under formation of the achiral tri-coordinate species. This review will present the different approaches in overcoming the inherent tendency of racemization in boron-stereogenic compounds. When embedded in an environment of chiral ligands or substituents, configurationally stable boron stereogenic centers can form in a diastereoselective manner. Compounds incorporating boron as the exclusive stereogenic center are obtained by resolution of the racemic mixtures. The recently developed – much more efficient – methods of a catalytic, enantioselective creation of boron stereogenic compounds are highlighted in this review. Finally the chiroptical properties of enantiomerically pure boron complexes that makes them promising materials or devices are addressed.

04 Dec 10:19

[ASAP] Aromaticity Reversal Induced by Vibrations in Cyclo[16]carbon

by Igor Rončević, Freddie J. Leslie, Max Rossmannek, Ivano Tavernelli, Leo Gross, and Harry L. Anderson

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.3c10207
21 Aug 12:36

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13 Apr 10:09

Delayed fluorescence from a zirconium(iv) photosensitizer with ligand-to-metal charge-transfer excited states

by Yu Zhang

Nature Chemistry, Published online: 16 March 2020; doi:10.1038/s41557-020-0430-7

Understanding the photophysical properties of transition-metal complexes is paramount to advances in photocatalysis, solar energy conversion and light-emitting diodes. Now, long-lived emission via thermally activated delayed fluorescence has been demonstrated from an air- and water-stable zirconium complex featuring excited states with significant ligand-to-metal charge transfer character.