page_title: Iron(II) chloride
section_title: Hydrates
hierarchical_section_title: Iron(II) chloride / Hydrates
caption_attribution_description: English: structure of the coordination polymers with the formula MX2(H2O)2
context_page_description: Iron(II) chloride, also known as ferrous chloride, is the chemical compound of formula FeCl₂. It is a paramagnetic solid with a high melting point. The compound is white, but typical samples are often off-white. FeCl₂ crystallizes from water as the greenish tetrahydrate, which is the form that is most commonly encountered in commerce and the laboratory. There is also a dihydrate. The compound is highly soluble in water, giving pale green solutions.
context_section_description: The dihydrate, FeCl₂(H₂O)₂, crystallizes from concentrated hydrochloric acid.  The dihydrate is a coordination polymer.  Each Fe center is coordinated to four doubly bridging chloride ligands.  The octahedron is completed by a pair of mutually trans aquo ligands.
caption: Subunit of FeCl2(H2O)2 lattice.
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