Tin(II) hydroxide

Tin(II) hydroxide, Sn(OH)₂, also known as stannous hydroxide, is an inorganic compound tin(II). The only related material for which definitive information is available is the oxy hydroxide Sn₆O₄(OH)₄, but other related materials are claimed. They are all white solids that are insoluble in water.

Tin(II) hydroxide

Names
IUPAC name Tin(II) hydroxide
Other names Stannous hydroxide
Identifiers
CAS Number	12026-24-3 Y
3D model (JSmol)	Interactive image
ChemSpider	19989070
ECHA InfoCard	100.031.542
EC Number	234-710-9
PubChem CID	9793862
CompTox Dashboard (EPA)	DTXSID8042474 DTXSID101014203, DTXSID8042474
InChI InChI=1S/2H2O.Sn/h2*1H2;/q;;+2/p-2 Key: FBGKGORFGWHADY-UHFFFAOYSA-L
SMILES [OH-].[OH-].[Sn+2]
Properties
Chemical formula	Sn(OH)2
Molar mass	152.73 g/mol
Thermochemistry
Std molar entropy (S⦵298)	155 J·mol−1·K−1[1]
Std enthalpy of formation (ΔfH⦵298)	−561 kJ·mol−1[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation and structure

Crystals of Sn₆O₄(OH)₄ has been characterized by X-ray diffraction. This cluster is obtained from solution of basic solutions of tin(II). The compound consists of an octahedron of Sn centers, each face of which is capped by an oxide or a hydroxide. The structure is reminiscent of the Mo₆S₈ subunit of the Chevrel phases..^[2] The structure of pure Sn(OH)₂ is not known.^[3]

Sn(OH)₂ has been claimed to arise from the reaction of (CH₃)₃SnOH with SnCl₂ in an aprotic solvent:^[3]

2 Me₃SnOH + SnCl₂ → Sn(OH)₂ + 2 Me₃SnCl

No crystallographic characterization is available on this material.

Reactions

Stannous hydroxide adds additional hydroxide ligands to form stannites.^[4] Air easily oxidizes stannous hydroxide to stannic oxide (SnO₂).