Tin(II) oxide
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Tin(II) oxide (stannous oxide) is a chemical material in a powdered state. It is a blue/black powder most commonly used as a precursor in manufacture of other tin salts. It has a minor use as an esterfication catalyst.
SnO adopts the tetragonal litharge structure with a stereochemically active Sn(II) lone pair directed between the layers. The electronic band gap has been measured between 2.5eV and 3eV.