True boundary for the formation of homoleptic transition-metal hydride complexes.
Angew Chem Int Ed Engl
; 54(19): 5650-3, 2015 May 04.
Article
em En
| MEDLINE
| ID: mdl-25773066
ABSTRACT
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 Groupsâ
7-12. Here we present evidence for the formation of Mg3 CrH8 , containing the first Groupâ
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 Groupâ
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 Groupâ
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.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article