Titanium(II) oxide

<p>Titanium(II) oxide (<a href="/facts/Titanium/53ArnDoy">Ti</a><a href="/facts/Oxygen/acyn6o8r">O</a>) is an <a href="/facts/Inorganic/TfFfzxSz">inorganic</a> <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> of titanium and oxygen. It can be prepared from <a href="/facts/Titanium_dioxide/T0KWmKcz">titanium dioxide</a> and titanium metal at 1500 °C. It is <a href="/facts/Non-stoichiometric/DAssoN0e">non-stoichiometric</a> in a range TiO0.7 to TiO1.3  and this is caused by vacancies of either Ti or O in the defect rock salt structure. In pure TiO 15% of both Ti and O sites are vacant,  as the vacancies allow metal-metal bonding between adjacent Ti centres. Careful annealing can cause ordering of the vacancies producing a monoclinic form which has 5 TiO units in the primitive cell that exhibits lower resistivity. A high temperature form with titanium atoms with trigonal prismatic coordination is also known. Acid solutions of TiO are stable for a short time then decompose to give hydrogen:
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2 Ti2+(aq) + 2 H+(aq) → 2 Ti3+(aq) + H2(g)
<p>Gas-phase TiO shows strong bands in the optical spectra of cool (<a href="/facts/Stellar_classification/dYrIuK9H">M-type</a>) stars. In 2017, TiO was claimed to be detected in an <a href="/facts/Exoplanet/zjfmqfUf">exoplanet</a> atmosphere for the first time; a result which is still debated in the literature. Additionally, evidence has been obtained for the presence of the diatomic molecule TiO in the interstellar medium.
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Titanium(II) oxide open-in-new

Titanium(II) oxide