Abstract
After a critical examination of current quantum chemical ab initio methods and their use for the study of chemical problems a classification of the different types of double bonds and a qualitative discussion of their properties is given. Then the results of some recent computations on small molecules that involve CO, CS or related double bonds are reviewed. This review includes ground state properties such as molecular geometries, dipole moments, force fields and vibrational frequencies, further ionization potentials, UV spectra and properties of excited states, intermolecular and intramolecular interactions (mainly proton affinities and hydrogen bonding), and finally chemical reactions, both involving the ground state and excited states.
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