Prof. Pierre Kennepohl, Department of Chemistry,University of British Columbia, Vancouver, BC, Canada.
Halogen bonding (XB) is a recently popular form of intramolecular interaction (often called noncovalent interaction) for the construction of supramolecular assemblies as an alternative to hydrogen bonding (HB) and coordinate bonding (CB). XB interactions are an attractive choice in this regard as they are highly directional and the strength of the interaction can be tuned over a very large range (~ 5-150kJ/mol). Theoretical studies have converged on the idea that XB interactions are (for the most part) dominated by electrostatic bonding but the corresponding experimental data have been thus far lacking. This seminar will outline our initial forays into defining XB interactions using a combination of electronic and vibrational spectroscopies. Most notably, our results indicate that XB have a strong covalent (charge transfer) contribution that must have important consequences on their chemical nature. The covalent contribution is significantly greater than what is observed in HB but of a similar magniture to CB. Our results are presented within the context of providing an experimentally validated description of so-called noncovalent interactions as a whole.
Site web du groupe du Prof. Kennepohl
Cette conférence est présentée par le RQMP Versant Nord du Département de physique de l'Université de Montréal et le Département de génie physique de Polytechnique Montréal.
