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Stannane
Structure and dimensions of the stannane molecule
Structure and dimensions of the stannane molecule
Ball-and-stick model of the stannane molecule
Ball-and-stick model of the stannane molecule
Space-filling model of the stannane molecule
Space-filling model of the stannane molecule
  Tin, Sn
  Hydrogen, H
Names
IUPAC name
Stannane
Other names
tin tetrahydride
tin hydride
tin(IV) hydride
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
  • InChI=1S/Sn.4H checkY
    Key: KXCAEQNNTZANTK-UHFFFAOYSA-N checkY
  • InChI=1/Sn.4H/rH4Sn/h1H4
    Key: KXCAEQNNTZANTK-GVMKXMNPAM
  • [Sn]
Properties
SnH4
Molar mass 122.71 g/mol
Appearance colourless gas
Density 5.4 g/L, gas
Melting point −146 °C (−231 °F; 127 K)
Boiling point −52 °C (−62 °F; 221 K)
Structure
Tetrahedral
0 D
Thermochemistry
1.262 kJ/(kg·K)
162.8 kJ/mol
19.049 kJ/mol
Related compounds
Related organotins
 tributylstannane (Bu3SnH)
Related compounds
 Methane
Silane
Germane
Plumbane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Stannane /ˈstæneɪn/ or tin hydride is an inorganic compound with the chemical formula SnH4. It is a colourless gas and the tin analogue of methane. Stannane can be prepared by the reaction of SnCl4 and Li[AlH4].[1]

SnCl4 + Li[AlH4] → SnH4 + LiCl + AlCl3

Stannane decomposes slowly at room temperature to give metallic tin and hydrogen and ignites on contact with air.[1]

Variants of stannane can be found as a highly toxic, gaseous, inorganic metal hydrides and group 14 hydrides.

See also

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Stannane

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Stannane, with the SnH₄, is an consisting of one tin atom bonded to four atoms in a tetrahedral arrangement, serving as the simplest of tin and the group 14 analogue of . It appears as a colorless, flammable gas with a of 122.71 g/mol, a of -146 °C, a of -52 °C, and a of approximately 5.4 kg/m³ in the gaseous state. Due to its high reactivity and instability, stannane decomposes readily at into elemental tin and dihydrogen gas (Sn + 2H₂), making it pyrophoric and requiring careful handling under inert or cryogenic conditions. Stannane is typically synthesized through the reduction of tin halides, such as tin(IV) chloride (SnCl₄) with lithium aluminum hydride (LiAlH₄) in solvents like dibutyl ether or dimethoxyethane at temperatures ranging from -196 °C to -30 °C, or via tin(II) chloride (SnCl₂) with sodium borohydride (NaBH₄), which can achieve yields of up to 84%. These methods produce the gas in situ for immediate use, as storage is impractical due to its thermal instability. Beyond its fundamental chemistry, stannane has emerged as a subject of significant research interest for its superconducting properties under . Synthesized experimentally at pressures of 180–210 GPa using diamond anvil cells—either by reacting SnCl₄ with LiAlH₄ or metallic tin with hydrogen sources like laser-heated —stannane adopts a face-centered cubic (fcc) structure ( Fm3m). This high-pressure phase exhibits with a critical (Tc) of 72 K at 180 GPa, rising to 75 K near 200 GPa, alongside a superconducting gap of 21.6 meV and non-Fermi-liquid behavior. Such findings position stannane as a candidate for studying hydrogen-rich superconductors, though practical applications remain exploratory. In industrial contexts, stannane arises as an unstable by-product during plasma cleaning of tin deposits in (EUV) systems for manufacturing, where its decomposition can lead to redeposition on optical components, necessitating advanced management strategies. Overall, while primarily a compound, stannane's unique reactivity and pressure-induced properties highlight its role in advancing and .

Properties

Physical properties

Stannane (SnH₄) is a colorless gas at . Its is 122.71 g/mol, and it has a density of 5.4 g/L at STP. The compound exhibits low boiling and melting points characteristic of group 14 hydrides, with a of −146 °C (127 ) and a of −52 °C (221 ). These values reflect its high volatility, analogous to lighter homologues such as and . Thermodynamic data for stannane include a standard molar heat capacity of 49 J/(mol·K) at 298.15 K and a standard entropy of 227.7 J/(mol·K) at 298.15 K. Stannane shows limited solubility in water but is more soluble in organic solvents, such as diethyl ether, where it can be handled during preparation and storage.

Chemical properties

Stannane (SnH₄) exhibits significant thermodynamic instability, as evidenced by its standard enthalpy of formation (ΔH_f°) of +162.8 kJ/mol, which is positive and endothermic relative to its constituent elements, tin and hydrogen. This endothermic nature underscores its inherent tendency toward decomposition, making it a highly reactive species under ambient conditions. The compound is highly flammable and poses a severe fire hazard, leading to spontaneous ignition upon exposure to atmospheric oxygen. This pyrophoric behavior aligns with the general reactivity profile of group 14 , where weaker metal-hydrogen bonds facilitate rapid oxidation. As a group 14 metal , stannane displays characteristic of this class, acting as a hemolytic that inhibits in a manner similar to by disrupting enzymatic processes in blood cells. Exposure can lead to severe systemic effects, including and organ damage, necessitating stringent handling precautions.

Synthesis

Laboratory methods

The first laboratory synthesis of stannane (SnH₄) was achieved in 1924 by Fritz Paneth and Eugen Rabinowitsch through electrolytic (cathodic) reduction in hydrochloric acid, yielding only small quantities of the unstable gas for initial characterization of its properties. The standard laboratory preparation of SnH₄ involves the controlled reduction of tin(IV) chloride (SnCl₄) with lithium aluminum hydride (LiAlH₄) in anhydrous diglyme at low temperature, typically from -70 °C to 0 °C, to minimize decomposition. The reaction proceeds according to the balanced equation: SnCl4+LiAlH4→SnH4+LiCl+AlCl3\text{SnCl}_4 + \text{LiAlH}_4 \rightarrow \text{SnH}_4 + \text{LiCl} + \text{AlCl}_3 This method affords SnH₄ in yields up to approximately 80-84%, depending on the scale and conditions. The procedure requires strictly anhydrous conditions to prevent side reactions with moisture, with SnCl₄ added dropwise as a diglyme solution to a stirred suspension of LiAlH₄ in diglyme under an inert atmosphere such as argon. The evolved SnH₄ gas is isolated by vacuum distillation into a cold trap, followed by purification to remove solvent and unreacted reagents. The product, a colorless and pyrophoric gas, must be stored at -196 °C in liquid nitrogen to maintain stability. An alternative laboratory reductant is sodium borohydride (NaBH₄) in diglyme solvent, which reduces SnCl₄ or tin(II) chloride to SnH₄ with yields around 70%, offering a milder and safer approach under similar anhydrous, low-temperature conditions. Deuterated reagents such as LiAlD₄ can be employed analogously to prepare isotopologues like SnD₄ for spectroscopic studies.

Alternative preparations

Stannane can be generated electrochemically through cathodic reduction at tin electrodes in acidic media, where intermediates form at the , leading to the evolution of gaseous SnH4 alongside colloidal tin products. This method is typically observed during high-current-density (e.g., 500–600 mA cm⁻²) and is influenced by factors such as cation concentration and , with higher acidity promoting formation. A plasma-based approach involves exposing tin metal to plasma, which etches the surface to produce SnH4 via volatile species, though yields are limited due to rapid decomposition back to tin and H2. This reaction is relevant in contexts like of tin surfaces, where atomic drives the formation of stannane at elevated temperatures or under non-thermal plasma conditions. Isotopic labeling is achieved by modifying the standard reduction procedure: deuterostannane (SnD4) is synthesized via low-temperature reaction of tin tetrachloride (SnCl4) with lithium aluminum deuteride (LiAlD4) in anhydrous diglyme, yielding the fully deuterated hydride for spectroscopic studies. This variant maintains high purity when conducted under inert conditions to prevent hydrolysis.

Structure and bonding

Molecular geometry

Stannane (SnH₄) adopts a in the gas phase, with the central tin atom surrounded by four equivalent Sn-H bonds arranged in a symmetric . This configuration arises from the sp³ hybridization of the tin atom, leading to H-Sn-H bond angles of approximately 109.5°.[] The geometry mirrors that of other group 14 tetrahydrides, such as (CH₄), highlighting in bond arrangement. The Sn-H bond length is approximately 1.71 Å, as determined from vibration-rotation Raman spectroscopy, which yields an effective bond distance (r₀) of 1.7108 ± 0.0010 Å. Complementary microwave spectroscopy measurements provide an equilibrium bond length (rₑ) of 1.6935 ± 0.0084 Å, confirming the covalent nature of the bonds through rotational constant analysis. The molecule possesses Td point group symmetry, characteristic of tetrahedral structures with no distinguishing axes or planes that would induce polarity, resulting in a dipole moment of 0 D.[] In terms of vibrational spectroscopy, stannane's four fundamental modes follow Td symmetry selection rules: the symmetric stretch (ν₁, A₁) is infrared inactive and observed only in Raman at 1871 cm⁻¹, while the asymmetric stretch (ν₃, F₂) is infrared active with a prominent band at 1897 cm⁻¹; the degenerate bends (ν₂, E, Raman active at 778 cm⁻¹ and ν₄, F₂, infrared active at 652 cm⁻¹) complete the set, enabling detailed structural confirmation through overtone and combination band analyses.[]

Electronic structure

Stannane, SnH₄, features a central tin atom that undergoes sp³ hybridization, involving the mixing of its valence 5s and three 5p orbitals to generate four equivalent hybrid orbitals. These hybrid orbitals form sigma bonds through overlap with the 1s orbitals of the four hydrogen atoms, resulting in a tetrahedral arrangement consistent with valence shell electron pair repulsion theory. In the molecular orbital description, the bonding arises from the interaction of the tin 5s and 5p atomic orbitals with the hydrogen 1s orbitals, producing four bonding molecular orbitals that are primarily sigma in character. The highest occupied molecular orbital (HOMO) exhibits predominantly Sn 5p character, reflecting the contribution of p orbitals to the valence bonding framework, while the lowest unoccupied molecular orbital (LUMO) is antibonding in nature.[] Density functional theory (DFT) computations, such as those employing hybrid functionals, yield a Sn-H bond dissociation energy of approximately 251 kJ/mol, underscoring the moderate strength of these bonds relative to lighter group 14 analogs.[] Relativistic effects play a significant role in the electronic structure of stannane due to tin's high atomic number, causing contraction of the 5s orbital and expansion of the 5p orbitals. This differential contraction reduces the effective overlap between the tin 5s-dominated hybrid components and hydrogen 1s orbitals, thereby weakening the Sn-H bonds compared to non-relativistic predictions or those for silane and germane. Four-component Dirac-Hartree-Fock calculations confirm this, showing a relativistic shortening of the bond length by about 0.02 Å alongside adjustments to vibrational frequencies that align with diminished bond strength.[][]

Stability and reactions

Decomposition pathways

Stannane undergoes primarily via the overall reaction SnH4 → Sn + 2 H2, which is exothermic with ΔH = -162.8 kJ/mol. This process is in SnH4, as established by early kinetic studies, though practical decomposition is often accelerated by on surfaces such as the metallic tin produced during the reaction. At (approximately 25 °C), the of stannane is on the order of 10 hours under typical conditions, with the reaction catalyzed by trace metals or the accumulating tin deposit, leading to autocatalytic behavior. The stoichiometry can also be represented as 2 SnH4 → 2 Sn + 4 H2 to emphasize the balanced production of gas and tin metal. While pure gas-phase exhibits high activation barriers, resulting in slow rates, the observed kinetics in practice reflect surface-mediated pathways that lower the effective energy barrier. Illumination or exposure to can further catalyze by initiating radical processes akin to photolysis. Photochemical of stannane occurs under irradiation at wavelengths λ < 200 nm, such as 147 nm vacuum-UV , which cleaves Sn-H bonds to generate reactive intermediates including SnH2, SnH, and H radicals. These subsequently recombine or react to yield the stable products Sn(s) and H2, with minor amounts of Sn2H6 observed at low pressures; quantum yields for SnH4 consumption reach approximately 5.6 at 0.2 , decreasing with increasing pressure due to collisional . The process aligns with the overall SnH4 → Sn + 2 H2, mirroring the thermal pathway but driven by absorption rather than .

Reactivity

Stannane reacts vigorously with oxygen, undergoing spontaneous ignition in air to form tin(IV) oxide and water according to the equation SnH₄ + 2 O₂ → SnO₂ + 2 H₂O. This high reactivity toward oxidation necessitates handling stannane under inert atmospheres to prevent combustion. As a Lewis base, stannane forms adducts with Lewis acids, exemplified by coordination to group 13 elements such as boron trifluoride, resulting in species like H₃Sn–BF₃. These adducts arise from the interaction of the lone pair on tin with the empty orbital of the acid, stabilizing the otherwise labile stannane. In organometallic synthesis, stannane serves as a by transferring equivalents, often leading to the formation of tin(II) . For instance, reaction with iron nonacarbonyl, Fe₂(CO)₉, produces the tin(II) cluster Sn[Fe₂(CO)₈]₂. This transfer underscores stannane's utility in generating low-valent tin compounds for further synthetic applications.

High-pressure behavior

Crystal structures

Stannane (SnH₄) exists as a gas at room temperature and atmospheric pressure, where it slowly decomposes into tin and hydrogen. It condenses to a liquid at its boiling point of −52 °C (221 K) and freezes into a molecular solid below its melting point of −146 °C (127 K). The low-temperature solid phase is unstable upon warming and decomposes, but neutron diffraction studies on the isotopically substituted SnD₄ reveal a crystalline structure with monoclinic symmetry (space group C₂/c), consisting of tetrahedral SnD₄ molecules arranged in a three-dimensional network linked by weak Sn···D intermolecular contacts (e.g., 3.377 Å and 3.439 Å at 5 K). Nuclear magnetic resonance data indicate a phase transition in solid SnH₄ at approximately 98 K, though no structural change is observed down to 5 K. Theoretical investigations using evolutionary crystal structure prediction methods predict that SnH₄ becomes thermodynamically stable under above approximately 96–108 GPa, beyond which it undergoes phase transitions. Below this threshold, the compound decomposes into elemental tin and H₂. The initial high-pressure phase is orthorhombic with Ama₂, stable from about 96 GPa to 180 GPa. At higher pressures exceeding 180 GPa, it transitions to a hexagonal phase with P6₃/mmc. These phases are metallic and feature layered arrangements that differ from the molecular gas-phase structure. In the Ama₂ phase, tin atoms form hexagonal close-packed layers, intercalated by semimolecular H₂ units with H–H bond lengths of approximately 0.79 ; these H₂ molecules alternate in orientation between layers, contributing to . The higher-pressure P6₃/mmc phase exhibits a denser hexagonal close-packed tin sublattice, with H₂ units occupying channels and additional Sn–H···H–Sn chains linking the layers. This hydrogen segregation into molecular-like H₂ entities amid a metallic tin framework enhances the overall cohesion and of the solid, distinguishing these phases from fully covalent hydrides. Experimental confirmation of high-pressure SnH₄ phases has been achieved through direct synthesis in diamond anvil cells. (XRD) studies at facilities such as the European Synchrotron Radiation Facility and have identified a cubic face-centered phase (space group Fm¯3m) for SnH₄ synthesized at 180–210 GPa, featuring a face-centered cubic tin sublattice with refined hydrogen positions indicating covalent Sn–H bonding and metallization onset around 10 GPa. complements these findings by tracking vibrational modes during synthesis, confirming phase purity and pressure-induced changes, such as the disappearance of molecular H₂ signals above critical pressures. While theoretical phase boundaries align broadly with experimental stability ranges, direct XRD verification of the predicted Ama₂ and P6₃/mmc structures remains elusive due to synthesis challenges, though the observed cubic phase suggests possible structural analogs at intermediate pressures. Predicted electronic properties in these high-pressure phases, including potential , further motivate ongoing structural probes.

Superconductivity

Theoretical predictions based on calculations indicate that stannane (SnH4_4) becomes a high-temperature under megabar pressures. In the hexagonal P63/mmcP6_3/mmc phase, which is thermodynamically stable above 180 GPa, the superconducting critical temperature TcT_c is estimated at 52--62 at 200 GPa, arising from electron- coupling with strength λ≈0.87\lambda \approx 0.87. Earlier computational studies of a layered metallic phase suggest even higher TcT_c values up to 80 near 120 GPa, where soft modes due to nesting and Kohn anomalies significantly enhance the coupling. Experimental evidence confirms in compressed SnH4_4, with a face-centered cubic synthesized at 180--210 GPa exhibiting Tc≈70T_c \approx 70 . Measurements reveal non-Fermi in these samples, manifested as linear temperature-dependent electrical resistance and upper critical field, indicative of anomalous metallic transport akin to strange metals. The follows a type-II BCS mechanism, where -mediated pairing occurs within the metallic Sn-H lattice, facilitated by high-frequency vibrations of atoms. Density functional theory models further elucidate the role of lattice dynamics, showing phonon softening in the high-pressure metallic phases that leads to dynamic instabilities and boosts electron-phonon interactions, potentially contributing to the elevated TcT_c. These properties are intrinsically linked to the underlying crystal structures under compression, such as the P63/mmcP6_3/mmc phase.

History

Discovery

Stannane (SnH₄) was first isolated and characterized in 1924 by chemists Fritz Paneth and Emanuel Rabinowitsch through the electrolytic reduction of tin amalgam in solution. The process involved setting up an with a tin-mercury amalgam and a immersed in dilute HCl, where cathodic polarization at a suitable voltage generated the gas directly at the surface. This method marked the initial successful preparation of pure stannane, overcoming prior challenges in synthesizing volatile metal hydrides without contamination. Upon generation, the compound appeared as a colorless, odorless gas that demonstrated immediate instability, decomposing spontaneously to deposit a characteristic tin mirror on the walls of the containing vessel while releasing gas (SnH₄ → Sn + 2H₂). This occurred rapidly, often within seconds at , highlighting stannane's kinetic instability despite its thermodynamic favorability. These observations provided early evidence of its identity as a distinct molecular species analogous to and germane. Further confirmation of stannane's composition came from precise measurements, which aligned with the molecular weight and volatility expected for SnH₄, and from its reaction upon exposure to air, consistent with the formation of tin oxides and water. These properties distinguished it from other potential gaseous products of the . The seminal work was detailed in a publication in Berichte der deutschen chemischen Gesellschaft, formally establishing stannane as tin tetrahydride and laying the groundwork for subsequent studies on group 14 hydrides.

Key developments

In the , spectroscopic studies provided the first detailed characterization of stannane's molecular properties, confirming its tetrahedral geometry through analysis of vibrational modes. The of SnH4 was recorded, revealing absorption bands at 2189 cm⁻¹ (ν₃, asymmetric stretch) and 1897 cm⁻¹ (ν₁, symmetric stretch), consistent with Td expected for group 14 hydrides. These observations supported the analogy to and , establishing SnH4 as a colorless, unstable gas with bond lengths estimated around 1.71 based on force constant calculations. During the , advances in high-resolution enabled more precise analysis of SnH4's vibrational structure, facilitating studies on its isotopic variants and stability under controlled conditions. Monoisotopic ¹¹⁶SnH₄ was examined using and in the 1775–2025 cm⁻¹ region, assigning over 200 lines to the ν₁/ν₃ dyad and refining rotational constants (B = 1.8025 cm⁻¹). These methods, combined with improved synthesis via reduction of SnCl₄ with LiAlH₄ in at low temperatures, allowed for purer samples and initial investigations into short-term storage at cryogenic temperatures to mitigate . The saw significant progress in theoretical and high-pressure research, highlighting SnH4's potential as a superconductor. Ab initio calculations predicted two metallic phases: an orthorhombic Ama2 structure stable at 96–180 GPa with Tc ≈ 15–22 K, and a hexagonal P6₃/mmc phase above 180 GPa with Tc ≈ 52–62 K, driven by electron-phonon coupling in hydrogen-rich layers. These findings positioned SnH4 alongside other group 14 hydrides as candidates for high-Tc under extreme conditions. In the 2020s, SnH4 emerged as a key byproduct in (EUV) , where of tin debris on collector generates volatile SnH₄, complicating systems. confirmed its formation via Sn + 4H → SnH₄, with cracking patterns showing dominant SnH₃⁺ and SnH₂⁺ fragments, and decomposition above -52 °C posing risks to . This identification has driven into strategies, such as plasma tuning to minimize SnH₄ yields while maintaining efficiency.

Applications

Research uses

Stannane (SnH₄) serves as a key precursor in (CVD) processes for synthesizing thin tin-containing films, particularly in research. For instance, it has been employed to grow Ge₁₋ᵧSnᵧ alloys with tunable compositions for short-wave (SWIR) and long-wave (LWIR) photodetectors, enabling extended compositional ranges beyond traditional methods. Similarly, IR laser-induced CVD using SnH₄ and mixtures produces β-Sn and Sn-Si nanodisperse alloys, highlighting its utility in creating nanoscale materials for optoelectronic applications. These applications leverage SnH₄'s volatility and reactivity to deposit uniform films on substrates like or at relatively low temperatures. As a model compound, SnH₄ is extensively used in matrix isolation spectroscopy to investigate bonding and reactivity in . In matrices, co-deposition of SnH₄ with metal vapors, such as aluminum or , leads to the formation of novel binuclear hydrides like Al₂(μ-H)₂SnH₂ and Ga₂(μ-H)₂SnH₂, allowing detailed (IR) spectroscopic analysis of E-H bond and insertion reactions. These studies reveal the influence of metal on hydride stability and reactivity, with SnH₄'s larger size facilitating more pronounced interactions compared to lighter analogues like CH₄ or SiH₄. Matrix isolation preserves transient , enabling the characterization of weakly bound complexes and photolytic products essential for understanding chemistry. The SnD₄ finds application in neutron scattering experiments to probe (and by extension, ) positions in solid stannane, providing insights into lattice arrangements. Neutron powder diffraction studies of solid SnD₄ at low temperatures reveal a monoclinic structure ( C2/c) with Sn-D bond lengths of 1.706(3) , allowing precise localization of light atoms that is challenging with methods. This technique elucidates the molecular orientation and intermolecular interactions in the solid phase, contributing to broader understanding of dynamics in covalent hydrides. In high-pressure research, SnH₄ is synthesized and studied in diamond anvil cells to explore (see High-pressure behavior section for details).

Industrial relevance

Stannane (SnH4) plays a limited role in industrial processes, primarily as an unintended byproduct in manufacturing. In (EUV) , which is essential for producing advanced microchips, SnH4 forms during the plasma of tin droplets and debris on optical components such as collector mirrors. This reaction occurs when tin (Sn) interacts with plasma (Sn + 4H → SnH4), generating the volatile gas that can be pumped away to prevent , though its requires careful management to avoid redeposition on chamber surfaces. Recent studies as of 2025 have investigated SnH4 and sticking coefficients on metal surfaces to optimize in EUV environments. Despite its reactivity, SnH4 has been considered as a potential precursor for metal-organic chemical vapor deposition (MOCVD) in fabricating tin-doped semiconductors, such as those used in optoelectronic devices. However, its thermal instability—decomposing at room temperature to metallic tin and hydrogen—renders it unsuitable for practical use, with more stable alternatives like alkyltin compounds or tin halides preferred instead. In vacuum-based technologies, SnH4 can arise as a trace contaminant from interactions between tin residues and hydrogen environments, necessitating exhaust scrubbing and specialized pumping systems to mitigate deposition and maintain process purity. Due to its pyrophoric nature and rapid decomposition, SnH4 is not produced on a large scale commercially but is generated and handled only in controlled, low-volume industrial settings.

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