"Inverse sodium hydride": a crystalline salt that contains H(+) and Na(-)

Mikhail Y Redko; Mircea Vlassa; James E Jackson; Andrzej W Misiolek; Rui H Huang; James L Dye

doi:10.1021/ja025655+

"Inverse sodium hydride": a crystalline salt that contains H(+) and Na(-)

J Am Chem Soc. 2002 May 29;124(21):5928-9. doi: 10.1021/ja025655+.

Authors

Mikhail Y Redko¹, Mircea Vlassa, James E Jackson, Andrzej W Misiolek, Rui H Huang, James L Dye

Affiliation

¹ Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824-1322, USA.

PMID: 12022811
DOI: 10.1021/ja025655+

Abstract

A crystalline salt has been synthesized that contains H(+) and Na(-) rather than the usual hydride oxidation states of H(-) and Na(+). The key is irreversible encapsulation of H(+) within the cage of 3(6)adamanzane (Adz). The internal proton is kinetically inert to reduction by Na(-) in solution in NH(3)-MeNH(2) mixtures. Synthesis of the sodide is accomplished by a metathesis reaction between Na and AdzH(+)X(-) in which X(-) is a sacrificial anion such as glycolate, isethionate, or nitrate. Reduction or deprotonation of the sacrificial anion forms insoluble byproducts and AdzH(+)Na(-) in solution. After solvent removal, the sodide is dissolved in dimethyl ether and transferred through a frit into a separate chamber for crystallization. The compound was characterized as the sodide by analysis, NMR spectra, and optical absorption spectroscopy.