Journal
CHEM
Volume 6, Issue 2, Pages 406-418Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2019.11.006
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Funding
- JSPS KAKENHI, Japan [18H03874, 18K05192, 19H02551, 19H05046]
- MEXT Element Strategy Initiative to Form Core Research Center
- Murata Science Foundation, Japan
- KUMAGAI, Ogasawara
- Samco foundations for the Promotion of Science & Engineering, Japan
- Grants-in-Aid for Scientific Research [19H02551, 18H03874, 18K05192, 19H05046] Funding Source: KAKEN
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Hydrogen borides adopt a variety of structures because of the electron-deficient character of boron. Recently, we reported the synthesis of a layered hydrogen boride via a soft chemical route. Here, we ascertain the atomic arrangements in the layered hydrogen boride by using pair-distribution functions: the material dominantly consists of a corrugated B network decorated with three-center, two-electron B-H-B bridging bonds as well as ordinary two-center, two-electron B-H terminal bonds. The material is locally ordered but amorphous by diffractometry. This discrepancy can be accounted for by geometrical frustration caused by the positions of terminal B-H bonds located on one of two equivalent B atoms in the B-H-B bridging bonds. This material is electrically conductive (0.13 S cm(-1) below 10 degrees C) rather than ion conductive, and its B-H-B bonds are cleaved by the adsorption of molecules; this dynamic chemical nature originates from the frustrated structure and leads to unique hydrogen boride functionalities.
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