Abstract
Lamellar transition metal compounds are much-studied materials due to their unconventional electronic and magnetic properties. Intense research is focusing on the reasoned design of this type of material, based either on structural prediction techniques or on soft chemistry techniques known as " topochimics ". Topochemical reactions, which enable host material ions to be intercalated or deintercalated while retaining their structures, are one of the most effective methods for designing metastable lamellar materials. Over the past few decades, topochemical reactions based on the redox activity of cations have been widely studied. Conversely, topochemical reactions based on the redox activity of anions have been much less explored. This seminar presented the state of the art on the first studies demonstrating the redox activity of anions, particularly chalcogenides. It then showed how topochemical intercalation based on the redox activity of anions can be used to design lamellar (oxy)chalcogenide materials with interesting properties and/or functionalities.
