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Title: The structure and unconventional dihydrogen bonding of a pressure-stabilized hydrogen-rich (NH3BH3)(H2)x(x = 1.5) compound

Abstract

Combining X-ray diffraction, Raman spectroscopy, and ab initio simulations we characterize an extremely hydrogen-rich phase with the chemical formula (NH3BH3)(H2)x (x = 1.5). This phase was formed by compressing ammonia borane (AB, NH3BH3) in an environment with an excess of molecular hydrogen (H2). This compound can store a total of 26.8 wt% hydrogen, both as molecular hydrogen and chemically bonded hydrogen in AB, making it one of the most hydrogen-rich solids currently known. The new compound possesses a layered AB structure where additional H2 molecules reside in channels created through the weaving of AB layers. The unconventional dihydrogen bonding network of the new compound is significantly modified from its parent AB phase and contains H•••H contacts between adjacent AB molecules and between AB and H2 molecules. H–H can be either a proton donor or a proton acceptor that forms new types of dihydrogen bonding with the host AB molecules, which are depicted as H–H•••H–B or H–H•••H–N, respectively. Furthermore, this study not only demonstrates the strategy and the promise of using pressure for new material synthesis, but also unleashes the power of combining experiments and ab initio calculations for elucidating novel structures and unusual bonding configurations in dense low-Z materials.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Wake Forest Univ., Winston-Salem, NC (United States)
  3. Wake Forest Univ., Winston-Salem, NC (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1361157
Grant/Contract Number:  
DMR-1145968; 391888; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 15; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Lin, Yu, Welchman, Evan, Thonhauser, Timo, and Mao, Wendy L. The structure and unconventional dihydrogen bonding of a pressure-stabilized hydrogen-rich (NH3BH3)(H2)x(x = 1.5) compound. United States: N. p., 2017. Web. doi:10.1039/c7ta01005b.
Lin, Yu, Welchman, Evan, Thonhauser, Timo, & Mao, Wendy L. The structure and unconventional dihydrogen bonding of a pressure-stabilized hydrogen-rich (NH3BH3)(H2)x(x = 1.5) compound. United States. https://doi.org/10.1039/c7ta01005b
Lin, Yu, Welchman, Evan, Thonhauser, Timo, and Mao, Wendy L. Wed . "The structure and unconventional dihydrogen bonding of a pressure-stabilized hydrogen-rich (NH3BH3)(H2)x(x = 1.5) compound". United States. https://doi.org/10.1039/c7ta01005b. https://www.osti.gov/servlets/purl/1361157.
@article{osti_1361157,
title = {The structure and unconventional dihydrogen bonding of a pressure-stabilized hydrogen-rich (NH3BH3)(H2)x(x = 1.5) compound},
author = {Lin, Yu and Welchman, Evan and Thonhauser, Timo and Mao, Wendy L.},
abstractNote = {Combining X-ray diffraction, Raman spectroscopy, and ab initio simulations we characterize an extremely hydrogen-rich phase with the chemical formula (NH3BH3)(H2)x (x = 1.5). This phase was formed by compressing ammonia borane (AB, NH3BH3) in an environment with an excess of molecular hydrogen (H2). This compound can store a total of 26.8 wt% hydrogen, both as molecular hydrogen and chemically bonded hydrogen in AB, making it one of the most hydrogen-rich solids currently known. The new compound possesses a layered AB structure where additional H2 molecules reside in channels created through the weaving of AB layers. The unconventional dihydrogen bonding network of the new compound is significantly modified from its parent AB phase and contains H•••H contacts between adjacent AB molecules and between AB and H2 molecules. H–H can be either a proton donor or a proton acceptor that forms new types of dihydrogen bonding with the host AB molecules, which are depicted as H–H•••H–B or H–H•••H–N, respectively. Furthermore, this study not only demonstrates the strategy and the promise of using pressure for new material synthesis, but also unleashes the power of combining experiments and ab initio calculations for elucidating novel structures and unusual bonding configurations in dense low-Z materials.},
doi = {10.1039/c7ta01005b},
journal = {Journal of Materials Chemistry. A},
number = 15,
volume = 5,
place = {United States},
year = {2017},
month = {3}
}

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