Transition metal-hydrogen compounds. IV. Improved synthesis of enneahydridorhenates: the sodium and tetraethylammonium salts of ReH92-

Recent advances in the chemistry of rhenium

“…The highest yields have been attained using NaRe04 and sodium In ethanol (35% Na2ReH9). 196 Various erroneous formulations had been advanced until the anion was eventually characterized by Ginsberg and his coworkers by X-ray and neutron diffraction. Each rhenium atom in K2ReH9 is at the center of a trigonal prism of hydrogen atoms with three other hydrogens beyond the centers of the rectangular faces of the prism.…”

Cohesion ofBaReH9andBaMnH9Singh1, Gupta2, Gupta3 2007Phys. Rev. B161120View full textAdd to dashboardCite

“…BaReH 9 is the prototypical member of a family of hydrides, based on (ReH 9 ) 2− and (TcH 9 ) 2− structural units. 1,2,3,4,5,6 These compounds are of interest from a fundamental point of view 7 because of the unusual coordination of the transition metal atoms, which are surrounded by 9 hydrogen atoms, with relatively short metal-H bond lengths and are in an high formal valence state of 7. These compounds are also of practical interest because of the high hydrogen to metal ratio of 4.5 in BaReH 9 .…”

Formation of novel transition metal hydride complexes with ninefold hydrogen coordination

“…Complex transition metal hydrides represent a class of hydrogen-rich materials, wherein a number of H atoms covalently bind to a transition metal element ( T ) to form hydride complexes with a remarkably rich variety of H-coordination modes ranging from twofold to ninefold1111213141516171819202122232425. These complexes are stabilized by charge transfer from electropositive counterions, such as alkali and alkaline earth metals, to form insulating hydrides12023.…”

“…This limitation has so far precluded further discovery of hydride complexes with high H-coordination. For example, the presently known members with the ninefold H-coordination are limited to those comprising the Group 7 elements technetium ([TcH 9 ] 2− ) 11 and rhenium ([ReH 9 ] 2− ) 12 13 14 16 17 . However, we recently reported the formation of the first Group 6 hydride complex [CrH 7 ] 5− in Mg 3 CrH 8 25 , thereby demonstrating that there is no a priori reason for this limitation and paving the way for the discovery of higher H-coordination hydride complexes comprising unexplored elements to the left of Group 7.…”