| Unusual topochemical reactions Hiroshi Kageyama1; 1KYOTO UNIVERSITY, Kyoto, Japan; PAPER: 436/SolidStateChemistry/Regular (Oral) SCHEDULED: 15:55/Mon. 28 Nov. 2022/Andaman 1 ABSTRACT: Topochemical reactions have led to great progress in the discovery of new metastable compounds with novel chemical and physical properties. The host lattice is considered to be generally immobile and rigid, and the overall crystal architecture of the host oxides is maintained. In my talk, I will present two cases where non-trivial structural conversions occur at low temperatures. The first example is the hexagonal nitride hydride, h-Ca3CrN3H, which converts to an orthorhombic nitride, o-Ca3CrN3, under hydrogen at 673 K, which is accompanied by a rotational structural transformation [1]. The second example is expressed by "Bi12O17Cl2 --> Bi12O17–0.5xFxCl2 (x ≤ 6)", where a sextuple Bi6O8.5 block with 1D rock-salt (RS) units in the FL matrix along the a-axis changes to alternate FL and RS slabs along the c-axis [2]. References: [1] Y. Cao et al., Angew. Chem. Int. Ed. 2022, https://doi.org/10.1002/anie.202209187 [2] D. Kato et al., Adv. Funct. Mater. 32, 2204112/1-9 (2022) |
