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[[Vol. 58]New Insights into Structure of Layered Hydrogen Borides_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/d473eba5-bcc7-4ed6-ae39-3ea24a74d13c/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.58] New Insights into Structure of Layered Hydrogen Borides](https://mdr.nims.go.jp/datasets/5addb0c1-6a85-4ac3-8dd7-75cddcb6e916)

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2022/03/31 16:23 New Insights into Structure of Layered Hydrogen Borides| MANAhttps://www.nims.go.jp/mana/research/highlights/vol58.html 1/2Previous  Index  NextResearch Highlights[Vol. 58]New Insights into Structure of Layered Hydrogen Borides25 Mar, 2020A team of MANA researchers has determined the structure of a layered hydrogen boridesynthesized via a soft chemical route. The team found that the structure consists of B-H-B bridging bonds and B-H terminal bonds, and the local structure inducesmacroscopic amorphous nature by “geometrical frustration.” Since the layered hydrogenboride is electrically conductive, the finding points the way toward new applications.The team determined atomic arrangements in the layered hydrogen boride by using pair-distribution functions (that is, the probability of finding two atoms separated by a certain distancein the material). It found that the material mostly consisted of a corrugated B network decoratedwith three-center, two-electron B-H-B bridging bonds, as well as ordinary two-center, two-electronB-H terminal bonds. It was locally ordered but amorphous by diffractometry.The team accounted for this discrepancy by positing geometrical frustration, caused by thepositions of terminal B-H bonds located on one of two equivalent B atoms in the B-H-B bridgingbonds.This geometrical frustration accounts for the amorphous state of the layered HB and theteam dubbed this structure ‘‘frustrated hydrogen boride’’ (f-HB).https://www.nims.go.jp/mana/research/highlights/vol57.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol59.html2022/03/31 16:23 New Insights into Structure of Layered Hydrogen Borides| MANAhttps://www.nims.go.jp/mana/research/highlights/vol58.html 2/2Local B-H chemical bonds in f-HB appear to govern its macroscopic structure as well as itsconductivity upon adsorption of molecules. The material is electrically conductive rather than ion-conductive, and its B-H-B bonds are cleaved by the adsorption of molecules.Because f-HB is an electrically conductive solid-state material with local functional groups thatrespond to chemical adsorption, these findings could open up unique functionalities of HBmaterials, such as HB nanosheets as potential sensing materials and catalysts.This research was carried out by Satoshi Tominaka (Senior Researcher, Soft Chemistry Group,MANA, NIMS) and his collaborators.Reference“Geometrical Frustration of B-H bonds in Layered Hydrogen Borides Accessible by Soft Chemistry”Satoshi Tominaka, Ryota Ishibiki, Asahi Fujino, Kohsaku Kawakami, Koji Ohara, Takuya Masuda,Iwao Matsuda, Hideo Hosono, and Takahiro KondoJournal : Chem [February 13, 2020]DOI : 10.1016/j.chempr.2019.11.006(Press release on this research)"Development of a Novel Nanosheet with Adjustable Electrical Conductivity” (10 December 2019)https://www.nims.go.jp/mana/news_room/press/2019121001.html（MANA E-BULLETIN）https://www.nims.go.jp/mana/ebulletin/AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/tominaka_satoshi?locale=enhttps://samurai.nims.go.jp/profiles/tominaka_satoshi?locale=enhttps://samurai.nims.go.jp/profiles/hosono_hideo?locale=enhttps://www.sciencedirect.com/science/article/pii/S2451929419305169https://www.nims.go.jp/mana/news_room/press/2019121001.htmlhttps://www.nims.go.jp/mana/ebulletin/