Hiroshi Kageyama (Kyoto U) Mixed-Anion Chemistry and Physics: Expanding Frontiers in Inorganic Materials

Mixed-anion compounds, characterized by the presence of different anions within a single compound, have emerged as transformative inorganic materials, attracting significant attention [1]. In this seminar, I will provide an overview of the current state and potential of mixed-anion compounds, with a particular focus on hydride-containing materials. From a synthetic perspective, perovskite oxyhydrides [2] serve as valuable starting materials, enabling diverse anion-exchange reactions at low temperatures [3, 4]. The reactivity and lability of hydride anions make titanium-based oxyhydrides a novel catalyst for ammonia synthesis and CO2 [5-7]. Additionally, the absence of pi-symmetry in the valence shell of H- allows for intriguing phenomena, such as the novel insulator-metal transition observed in SrVO2H under high pressure [8]. Moreover, thin films of EuVO2H exhibit inter-site charge transfer, resulting in a four-fold enhancement of Tc and perpendicular magnetic anisotropy [9]. Non-oxide mixed-anion hydrides have also been developed as solid-state electrolytes [10, 11].
I hope that this seminar will shed light on the exciting possibilities offered by mixed-anion chemistry and physics, highlighting their potential applications in various fields. By discussing recent advancements and future challenges, I hope to inspire further exploration and innovation in this rapidly evolving area of research, with possible new collaborations.

References:
[1] H. Kageyama et al., Nat. Commun. 2018, 772.
[2] Y. Kobayashi et al., Nat. Mater. 2012, 11, 507.
[3] T. Yajima et al., Nat. Chem. 2015, 7, 1017.
[4] N. Masuda et al., J. Am. Chem. Soc. 2016, 138, 3211.
[5] Y. Kobayashi et al., J. Am. Chem. Soc. 2017, 139, 18725.
[6] Y. Tang et al., Adv. Ener. Mater. 2018, 1800800.
[7] Y. Tang et al., Adv. Ener. Mater. 2018, 1801772.
[8] T. Yamamoto et al., Nat. Commun. 2017, 8, 1217.
[9] M. Namba et al., submitted.
[10] H. Ubulata et al., Sci. Adv. 7, 2021, eabf7883.
[11] S. Gao et al., Nat. Commun. 2021, 12, 201.