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Sodium hydride
	; Sodium cation, Na+ Hydrogen anion, H−
Names
	IUPAC name Sodium hydride
Identifiers
CAS Number	7646-69-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	23144 ;
ECHA InfoCard	100.028.716
EC Number	231-587-3;
PubChem CID	24758;
UNII	23J3BHR95O ;
CompTox Dashboard (EPA)	DTXSID90893680 ;
	InChI InChI=1S/Na.H Key: MPMYQQHEHYDOCL-UHFFFAOYSA-N ; InChI=1/Na.H/q+1;-1 Key: BZKBCQXYZZXSCO-UHFFFAOYAY; InChI=1S/Na.H/q+1;-1 Key: BZKBCQXYZZXSCO-UHFFFAOYSA-N;
	SMILES [H-].[Na+];
Properties
Chemical formula	NaH
Molar mass	23.998 g/mol
Appearance	white or grey solid
Density	1.39 g/cm3
Melting point	638 °C (1,180 °F; 911 K)(decomposes)
Solubility in water	Reacts with water
Solubility	insoluble in all solvents
Band gap	3.51 eV (predicted)
Refractive index (nD)	1.470
Structure
Crystal structure	fcc (NaCl), cF8
Space group	Fm3m, No. 225
Lattice constant	a = 498 pm
Formula units (Z)	4
Coordination geometry	Octahedral (Na+); Octahedral (H−)
Thermochemistry
Heat capacity (C)	36.4 J/mol K
Std molar; entropy (S⦵298)	40.0 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−56.3 kJ·mol−1
Gibbs free energy (ΔfG⦵)	-33.5 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	highly corrosive, reacts violently with water or humid air.
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H260
NFPA 704 (fire diamond)	3 3 2 W
Flash point	combustible
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Sodium borohydride; Sodium hydroxide
Other cations	Lithium hydride; Potassium hydride; Rubidium hydride; Caesium hydride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium hydride is the chemical compound with the empirical formula Na H. This alkali metal hydride is primarily used as a strong yet combustible base in organic synthesis. NaH is a saline (salt-like) hydride, composed of Na⁺ and H⁻ ions, in contrast to molecular hydrides such as borane, silane, germane, ammonia, and methane. It is an ionic material that is insoluble in all solvents (other than molten sodium metal), consistent with the fact that H⁻ ions do not exist in solution.

Basic properties and structure

NaH is colorless, although samples generally appear grey. NaH is around 40% denser than Na (0.968 g/cm³).

NaH, like LiH, KH, RbH, and CsH, adopts the NaCl crystal structure. In this motif, each Na⁺ ion is surrounded by six H⁻ centers in an octahedral geometry. The ionic radii of H⁻ (146 pm in NaH) and F⁻ (133 pm) are comparable, as judged by the Na−H and Na−F distances.^[8]

"Inverse sodium hydride" (hydrogen sodide)

A very unusual situation occurs in a compound dubbed "inverse sodium hydride", which contains H⁺ and Na⁻ ions. Na⁻ is an alkalide, and this compound differs from ordinary sodium hydride in having a much higher energy content due to the net displacement of two electrons from hydrogen to sodium. A derivative of this "inverse sodium hydride" arises in the presence of the base [3⁶]adamanzane. This molecule irreversibly encapsulates the H⁺ and shields it from interaction with the alkalide Na⁻.^[9] Theoretical work has suggested that even an unprotected protonated tertiary amine complexed with the sodium alkalide might be metastable under certain solvent conditions, though the barrier to reaction would be small and finding a suitable solvent might be difficult.^[10]

Preparation

Industrially, NaH is prepared by introducing molten sodium into mineral oil with hydrogen at atmospheric pressure and mixed vigorously at ~8000 rpm. The reaction is especially rapid at 250−300 °C.

2 Na + H₂ → 2 NaH

The resultant suspension of NaH in mineral oil is often directly used, such as in the production of diborane.^[11]

Applications in organic synthesis

As a strong base

NaH is a base of wide scope and utility in organic chemistry.^[12] As a superbase, it is capable of deprotonating a range of even weak Brønsted acids to give the corresponding sodium derivatives. Typical "easy" substrates contain O-H, N-H, S-H bonds, including alcohols, phenols, pyrazoles, and thiols.

NaH notably deprotonates carbon acids (i.e., C-H bonds) such as 1,3-dicarbonyls such as malonic esters. The resulting sodium derivatives can be alkylated. NaH is widely used to promote condensation reactions of carbonyl compounds via the Dieckmann condensation, Stobbe condensation, Darzens condensation, and Claisen condensation. Other carbon acids susceptible to deprotonation by NaH include sulfonium salts and DMSO. NaH is used to make sulfur ylides, which in turn are used to convert ketones into epoxides, as in the Johnson–Corey–Chaykovsky reaction.

As a reducing agent

NaH reduces certain main group compounds, but analogous reactivity is very rare in organic chemistry (see below).^[13] Notably boron trifluoride reacts to give diborane and sodium fluoride:^[14]

6 NaH + 2 BF₃ → B₂H₆ + 6 NaF

Si–Si and S–S bonds in disilanes and disulfides are also reduced.

A series of reduction reactions, including the hydrodecyanation of tertiary nitriles, reduction of imines to amines, and amides to aldehydes, can be effected by a composite reagent composed of sodium hydride and an alkali metal iodide (NaH⋅MI, M = Li, Na).^[15]

Hydrogen storage

Although not commercially significant sodium hydride has been proposed for hydrogen storage for use in fuel cell vehicles. In one experimental implementation, plastic pellets containing NaH are crushed in the presence of water to release the hydrogen. One challenge with this technology is the regeneration of NaH from the NaOH formed by hydrolysis.^[16]

Practical considerations

Sodium hydride is sold as a mixture of 60% sodium hydride (w/w) in mineral oil. Such a dispersion is safer to handle and weigh than pure NaH. The compound is often used in this form but the pure grey solid can be prepared by rinsing the commercial product with pentane or tetrahydrofuran, with care being taken because the waste solvent will contain traces of NaH and can ignite in air. Reactions involving NaH usually require air-free techniques.

Safety

NaH can ignite spontaneously in air. It also reacts vigorously with water or humid air to release hydrogen, which is very flammable, and sodium hydroxide (NaOH), a quite corrosive base. In practice, most sodium hydride is sold as a dispersion in mineral oil, which can be safely handled in air.^[17] Although sodium hydride is widely used in DMSO, DMF or DMAc for SN2 type reactions there have been many cases of fires and/or explosions from such mixtures.^[18]^[19]

References

^ ^a ^b ^c ^d Haynes, p. 4.86
^ Singh, S.; Eijt, S. W. H. (30 December 2008). "Hydrogen vacancies facilitate hydrogen transport kinetics in sodium hydride nanocrystallites". Physical Review B. 78 (22): 224110. Bibcode:2008PhRvB..78v4110S. doi:10.1103/PhysRevB.78.224110.
^ Batsanov, Stepan S.; Ruchkin, Evgeny D.; Poroshina, Inga A. (2016). Refractive Indices of Solids. Springer. p. 35. ISBN 978-981-10-0797-2.
^ ^a ^b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A23. ISBN 978-0-618-94690-7.
^ Haynes, p. 5.35
^ Index no. 001-002-00-4 of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 340.
^ "New Environment Inc. – NFPA Chemicals". newenv.com. Archived from the original on 2016-08-27.
^ Wells, A.F. (1984). Structural Inorganic Chemistry, Oxford: Clarendon Press
^ Redko, M. Y.; Vlassa, M.; Jackson, J. E.; Misiolek, A. W.; Huang, R. H.; Dye, J. L.; et al. (2002). ""Inverse Sodium Hydride": A Crystalline Salt that Contains H⁺ and Na⁻". J. Am. Chem. Soc. 124 (21): 5928–5929. doi:10.1021/ja025655+. PMID 12022811.
^ Sawicka, Agnieszka; Skurski, Piotr; Simons, Jack (2003). "Inverse Sodium Hydride: A Theoretical Study" (PDF). J. Am. Chem. Soc. 125 (13): 3954–3958. doi:10.1021/ja021136v. PMID 12656631. Archived (PDF) from the original on 2013-02-09.
^ Rittmeyer, Peter; Wietelmann, Ulrich (2000-06-15), "Hydrides", in Wiley-VCH Verlag GmbH & Co. KGaA (ed.), Ullmann's Encyclopedia of Industrial Chemistry, Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, doi:10.1002/14356007.a13_199, ISBN 978-3-527-30673-2, retrieved 2023-11-21
^ Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. doi:10.1002/047084289X.
^ Too, Pei Chui; Chan, Guo Hao; Tnay, Ya Lin; Hirao, Hajime; Chiba, Shunsuke (2016-03-07). "Hydride Reduction by a Sodium Hydride–Iodide Composite". Angewandte Chemie International Edition. 55 (11): 3719–3723. doi:10.1002/anie.201600305. ISSN 1521-3773. PMC 4797714. PMID 26878823.
For early examples of NaH acting as a hydride donor, see ref. [3] therein.^{[citation needed]}
^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
^ Ong, Derek Yiren; Tejo, Ciputra; Xu, Kai; Hirao, Hajime; Chiba, Shunsuke (2017-01-01). "Hydrodehalogenation of Haloarenes by a Sodium Hydride–Iodide Composite". Angewandte Chemie International Edition. 56 (7): 1840–1844. doi:10.1002/anie.201611495. hdl:10356/154861. ISSN 1521-3773. PMID 28071853.
^ DiPietro, J. Philip; Skolnik, Edward G. (October 1999). "Analysis of the Sodium Hydride-based Hydrogen Storage System being developed by PowerBall Technologies, LLC" (PDF). US Department of Energy, Office of Power Technologies. Archived (PDF) from the original on 2006-12-13. Retrieved 2009-09-01.
^ "The Dow Chemical Company – Home". www.rohmhaas.com.
^ Yang, Qiang; Sheng, Min; Henkelis, James J.; Tu, Siyu; Wiensch, Eric; Zhang, Honglu; Zhang, Yiqun; Tucker, Craig; Ejeh, David E. (2019). "Explosion Hazards of Sodium Hydride in Dimethyl Sulfoxide, N,N-Dimethylformamide, and N,N-Dimethylacetamide". Organic Process Research & Development. 23 (10): 2210–2217. doi:10.1021/acs.oprd.9b00276.
^ UK Chemical Reaction Hazards Forum Archived 2011-10-06 at the Wayback Machine and references cited therein