True boundary for the formation of homoleptic transition-metal hydride complexes

Shigeyuki Takagi, Yuki Iijima, Toyoto Sato, Hiroyuki Saitoh, Kazutaka Ikeda, Toshiya Otomo, Kazutoshi Miwa, Tamio Ikeshoji, Katsutoshi Aoki, Shin Ichi Orimo

研究成果査読

28 被引用数 (Scopus)

抄録

Despite many exploratory studies over the past several decades, the presently known transition metals that form homoleptic transition-metal hydride complexes are limited to the Groups 7-12. Here we present evidence for the formation of Mg3CrH8, containing the first Group 6 hydride complex [CrH7]5-. Our theoretical calculations reveal that pentagonal-bipyramidal H coordination allows the formation of σ-bonds between H and Cr. The results are strongly supported by neutron diffraction and IR spectroscopic measurements. Given that the Group 3-5 elements favor ionic/metallic bonding with H, along with the current results, the true boundary for the formation of homoleptic transition-metal hydride complexes should be between Group 5 and 6. As the H coordination number generally tends to increase with decreasing atomic number of transition metals, the revised boundary suggests high potential for further discovery of hydrogen-rich materials that are of both technological and fundamental interest. [CrH7]5-: The true boundary for the formation of homoleptic transition-metal hydride complexes was demonstrated through the synthesis of Mg3CrH8 containing [CrH7]5-. Given a general trend of increasing H coordination number with decreasing atomic number of transition metals, these findings will pave the way for further discovery of hydrogen-rich materials that are of both technological and fundamental interest.

本文言語English
ページ(範囲)5650-5653
ページ数4
ジャーナルAngewandte Chemie - International Edition
54
19
DOI
出版ステータスPublished - 2015 5 4
外部発表はい

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)

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