Colloque

Molecular Interaction of Hydrogen Chloride with π-orbital Donor Molecules

D. Cook

W. G. Schneider

Y. Lupien

Membre a labase

D. Cook

Résumé du colloque

It is now becoming apparent that molecules having π-orbitals have a highly directed force field, although such molecules are usually considered to be non-polar. The π-orbital exhibits a definite 'donor' property relative to acceptor molecules such as hydrogen chloride. In order to investigate the donor nature of π-orbitals in olefinic, acetylenic and aromatic compounds, freezing point diagrams of a series of such compounds with hydrogen chloride were carried out. In these experiments it is assumed that HCL acts as an acceptor 'probe' molecule, and hence the composition of the molecular compounds appearing in the freezing point diagram should give information about the number of π-orbital donor centers in a given molecule. For ethylenic and acetylenic compounds the results indicate that each π-orbital complexes with a maximum of two HCL molecules, one on each lobe of the π-orbital. Benzene derivatives, on the other hand, form only 1:1 complexes with hydrogen chloride.