1. A widely cited references in connection with such ‘rules' is the classic book: Non Existent Compounds−Compounds of Low Stability; Dasent, W. E.; Marcel Dekker: New York, 1965. This work, now over a third of a century old, is “about compounds(among which are the heavier main group multiply bonded species)whose structures do not offend thesimpler rules of valence, but which nevertheless are characterized by a lowstability”. The author made it clear that even though many of the compounds discussed had never been prepared, it did not imply that they could not be synthesized in the future. The main themes of the book involved discussions of the factors that might account for the relative instability of such compounds.
2. Mehrfachbindungen in der anorganischen Chemie
3. Terminal chalcogenido complexes of Group 13 and 14 elements
4. Stable compounds of the heavier group 14 and 15 elements involving pπpπ multiple bonding: an overview of the first decade
5. (a) The chemical bond has been defined by Pauling as follows: “there is a chemical bond between two atoms or groups of atoms in case that the forces acting between them are such as to lead to the formation of an aggregate with sufficient stability to make it convenient for the chemist to consider it as an independent molecular species”. See: Pauling, L.TheNature of the Chemical Bond, 3rd ed.; Cornell University Press: 1960; p 6.