Polychalcogen molecules, ligands, and ions part 1: Homo- and heteronuclear chalcogen rings

The present chapter describes the recent developments in the chemistry of homo- and heteroatom chalcogen rings. The emphasis is on the relationships between the structures and bonding in cyclic polychalcogen molecules and ions, as well as on their ligand chemistry. The advent and progress in modern instrumental methods of analysis have shown that the structural features of chalcogen rings show a clear trend from sulfur to tellurium with the heavier elements often differing from sulfur.