Vibrational and computational data for homoleptic main-group element carbonyl complexes

Contrasting with the long history of transition element carbonyl complexes, the preparation, character-ization, and exploitation of carbonyl complexes of the main-group elements has only begun in recent decades. Several carbonyl complexes of the main-group elements have now been reported with a variety of different structures and types of bonding, either as neutral, anionic, or cationic species, or as CO com-plexes on different surfaces. These complexes have the potential to open-up new avenues in synthetic and catalytic chemistry, and to further our understanding of chemical bonding. A summary is given of vibrational studies that have proven to be indispensable in verifying the preparation and establishing the structures of these often-unstable complexes. The recording of the infrared spectra of main-group carbonyl complexes in cryogenic matrices and in the vapor state have been particularly useful in this regard. Many of these studies include theoretical calculations that have often been powerful tools in assigning the vibrational spectra and determining the structures of these complexes. Theoretical studies are also included that have predicted the vibrational spectra, structures, and relative stabilities of hypo-thetical complexes that have not yet been prepared. The reported data are mainly for homoleptic car-bonyl complexes of the main-group elements in groups 1,2, and 12-16 of the periodic table. (c) 2023 Elsevier B.V. All rights reserved.