186th MSL Lecture (Professor Michael Hayward)
| Date/Time | 2024/10/11 10:30 – 12:00 |
|---|---|
| Place | Meeting Room 1, H2 Building, Suzukakedai campus (No.27) Institute of Science Tokyo |
| Organizer | Laboratory for Materials and Structures |
| Contact | Azuma-Yamamato Lab.（Ext: 5315） |
| Language | English |
Subject & Detail
Speaker: Professor Michael Hayward
Inorganic Chemistry Laboratory, University of Oxford
Lecture theme: Low temperature Topochemical Reactions as a Route to Novel Electronic Materials
Abstract:
In a topochemical reaction atoms or ions are inserted into, or extracted from, an existing solid phase, whist retaining the overall crystal structure of the original material As these chemical manipulations are performed under kinetic control, extremely metastable phases can be produced By applying this synthetic strategy to complex transition metal oxides, for example via the low temperature ‘de-intercalation’ of oxide ions with binary metal hydrides (NaH, CaH2, LiH), phases containing transition metal cations with highly unusual combinations of oxidation state and coordination geometry can be prepared (e.g. square-planar Ni1+, Fe2+, Ru2+, Ir2+). Furthermore, these same binary hydrides can also bring about hydride-for-oxide anion exchange reactions, giving access to highly metastable transition-metal oxyhydride phases Recent results studying the topochemical reduction of Ru, Rh and Ir containing phases will be discussed, both in terms of the reactions which occur and the electronic behaviour of the highly reduced oxide and oxyhydride phases produced
