Lanthanum oxychloride or lanthanum oxide chloride is an inorganic compound with the chemical formula .
Synthesis and structure LaOCl can be prepared by treating with hydrochloric acid. It also us formed by hydrolysis of :
LaOCl adopts the structure seen also for lead chloride fluoride, which exists as the mineral matlockite. In this motif, the La3+ center is eight-coordinated, being bound to four chloride and four oxide ligands.
Physical properties LaOCl decomposes to at about 700 °C in static air.
The compound forms crystals of tetragonal system, space group P4/nmm.
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