Tin(II) oxide

Tin monoxide

Dark brown, odorless solid

Fixed

6.45 g · cm -3

1040 ° C ( by disproportionation to tin and tin dioxide )

Insoluble in water

Attention

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Tin ( II) oxide is a metastable compound consisting of tin and oxygen. Above 300 ° C SnO disproportionate to metallic tin and tin dioxide. Under certain circumstances, can form in this decomposition and the metastable Zinnsequioxid.

Production and representation

Tin ( II) oxide can be obtained over tin (II ) oxide hydrate of tin (II ) chloride, which is dehydrated at prolonged heating in aqueous solution.

Modifications and structure

The literature describes three modifications of tin monoxide (SnO ). The commonly known form is the crystallizing in the tetragonal PbO - form black - blue SnO ( α - PbO type, tP4, P4/nmm, space group No. 129, Z = 2, a = 3.800 Å, c = 4.836 Å). If the coarsely crystalline blue-black SnO ground in a mortar, then the color changes to brown.

Under normal conditions, there is up to 270 ° C, a metastable red modification with orthorhombic structure ( Pbcn, space group No. 60, Z = 8, a = 5:00 Å, b = 5.72 Å, c = 11:12 Å ) used to be by mechanical pressure or contact SnO with α - PbO structure transforms into this modification.

Another red modification with unknown structure is also described in the literature.