Ronald J. Gillespie

Professor Emeritus

B.Sc., Ph.D., D.Sc. (London), F.R.S., F.R.S.C., F.R.S.C. (U.K.), F.C.I.C.

Molecular Geometry

Contact Information
Curriculum Vitae

     My currents interests are in the field of Molecular Geometry. I have long been interested in further developing the VSEPR model and at the same time trying to understand why certain molecules appear to be exceptions to the model. Partly in collaboration with my colleague Richard Bader, I have been making use of the analysis of calculated electron density distributions to better understand the VSEPR model and molecular geometry in general. We have shown that the Laplacian of the electron density provides evidence for the localized lone pairs of the VSEPR model and we have developed the Lennard-Jones function which also provides evidence for lone pairs on a different basis.

     One of the largest classes of exceptions to the VSEPR model are certain molecules of the transition metals. We have shown that the deviations of the geometry of these molecules from the VSEPR model can be related to the distortion of the metal atom core from a spherical shape which we have been able to study by means of the Laplacian electron density. This investigation is continuing. Recently I have shown that the intramolecular distance between two given ligands is remarkably constant over a wide variety of molecules which led me to suggest that interligand interactions are much more important in determining geometry than has previously generally been supposed. This observation has led me to develop the ligand close packing (LCP) model.



Journal Articles:

Over 370 articles in the Journal of the American Chemical Society, Inorganic Chemistry, the Canadian Journal of Chemistry, the Journal of the Chemical Society, the Journal of Chemical Education and others.

Publications since 1992

Mailing Address:
Dr R.J. Gillespie
Department of Chemistry
McMaster University
Hamilton, Ont., Canada
L8S 4M1

Office: ABB-267

Voice (905) 525-9140, ext. 23307
FAX   (905) 522-2509


R.J. Gillespie: Curriculum Vitae; Publications since 1992
Chemistry Faculty
Department of Chemistry

01dec1999; rjg