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The ECA kindly invites you to the 32nd ECA Lunch webinar:
Abstract
From the knowledge of the distances at the atomic level and the arrangement in the solid phase many properties, both at the molecular and materials scale, can be deduced. However, the most basic concept, the chemical bond and reactivity, is still vigorously discussed. Still there is room for interpretation, because single crystal structural analyses based on the independent atom model only provides the positions of the centroids of the atoms and the distances between the atoms. In the electron density maps there are no lines or dashes defining or even indicating the chemical bond and the nature of the bonding remains a matter of interpretation based on a bonding model. Hence the anecdote that a bond is where the chemist draws the line remains valid to a certain extent. Most of our understanding of the chemical bond is still deduced from the distances and angles, which are determined as a result of the crystallographic analysis and reactivity is introduced on this basis.[1] Various topics are addressed in the talk and connected to reactivity:
1) Hal∙∙∙Hal bonding in [Cl3]– for safe Cl2 storage and transport. [2]
2) Chalcogen∙∙∙hydride bonding in Si–H activation.[3]
3) S=N vs. Sδ+–Nδ– bonding and consequences to e. g. single-molecule magnets.[4]
References
1. D. Stalke, Chemical concepts of bonding and current research problems, or: Why should we bother to engage in chemical bonding analysis? in Complementary Bonding Analysis, Ed: S. Grabowsky, de Gruyter, Berlin, Boston, ISBN 978-3-11-066006-7, 2021.
2. H. Keil, K. Sonnenberg, C. Müller, R. Herbst-Irmer, H. Beckers, S. Riedel, D. Stalke, Angew. Chem. 2021, 131, 2600-2604; Angew. Chem. Int. Ed. 2021, 60, 2569-2573, hot paper.
3. H. Keil, R. Herbst-Irmer, S. Rathjen, C. Girschik, T. Müller, D. Stalke, Inorg. Chem. 2022, 61, 6319-6325.
4. a) J. Jung, A. Münch, R. Herbst-Irmer, D. Stalke, Angew. Chem. Int. Ed. 2021, 60, 5679-5682; b) C. M. Legendre, E. Damgaard-Møller, J. Overgaard, D. Stalke, Eur. J. Inorg. Chem. 2021, 3108-3114.
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About the ECA Lunch webinars:
The ECA lunch webinars with an educational or scientific focus were invented following the strong wish to strengthen and vitalize the European crystallographic community. They are a monthly webinar series by the European Crystallographic Association (ECA) and involve all GIGs/SIGs.
The webinars are organized in an online setting such as Zoom (45min + 15min Q&A) and take place every first or second (depending on the schedule of other ECA activities) Thursday of a month at lunchtime (1:00 PM CET). Webinars will be announced via social media, mailing list, and here.
The webinars are organized by a steering committee of GIG01-members:
Breternitz, Joachim
Gaidamaka, Anna
Germann, Luzia
Hans, Philipp
Mazzeo, Paolo P.
Morana, Marta
Pisacic, Mateja
Prencipe, Michele
Advisory board:
Heinemann, Udo
van der Lee, Arie
