What is it about?

In a pyrrole the nitrogen lone pair belongs to the aromatic pi system, while for a standard N-B bond the lone pair will donate into the empty boron p orbital. In our case the lone pair has both options. The bond lengths suggest that there is a reduction in both aspects.

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Why is it important?

It was interesting to see how the boron affected the aromatic system of the pyrrole ring. The N-C bonds are lengthened compared to pyrrole, while the N-B is longer than a standard N-B bond. The molecule is a potential component for use in conductive materials.


Determination of this structure allowed our visitor from Turkey, sponsored by Tubitak, to get hands-on experience of measuring and analysing a crystal structure relevant to his work.

Nottingham Trent University

Read the Original

This page is a summary of: Crystal structure of bis(mesityl)(pyrrol-1-yl)borane, Acta Crystallographica Section E Crystallographic Communications, January 2023, International Union of Crystallography,
DOI: 10.1107/s2056989022011768.
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