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Potassium ferrioxalate contains the iron(III) complex [Fe(C 2 O 4) 3] 3−. In chemistry, iron(III) or ferric refers to the element iron in its +3 oxidation state. Ferric chloride is an alternative name for iron(III) chloride (FeCl 3). The adjective ferrous is used instead for iron(II) salts, containing the cation Fe 2+.
Ferric acetate is the iron compound with the formula Fe 3 O(O 2 CCH 3) 6 (H 2 O) 3]O 2 CCH 3. This red brown solid is the acetate salt of the coordination complex [Fe 3 O(OAc) 6 (H 2 O) 3] + (OAc − is CH 3 CO 2 −). Commonly, the salt is known as "basic iron acetate". [2] The formation of the red-brown complex was once used as a test for ...
The regular geometry is consistent with a high-spin Fe 3+ core with sp3d2 hybridization. As the metal orbitals are all evenly occupied the complex is not subject to Jahn-Teller distortions and thus adopts a D 3 molecular symmetry. In contrast, the related metal acetylacetonate Mn(acac) 3 adopts a more distorted octahedral structure. [3]
The Fe 3+ ion in ferric citrate (as in many iron(III) carboxylates) is reduced by exposure to light, [8] especially blue and ultraviolet, to Fe 2+ (ferrous) ion with concomitant oxidation of the carboxyl group adjacent to the hydroxyl, yielding carbon dioxide and acetonedicarboxylate: 2 Fe 3+ + R 2-C(OH)-CO − 2 → 2 Fe 2+ + R 2-C=O + H + + CO 2
Greigite, with the chemical formula Fe 2+ Fe 3+ 2 S 4, is a mixed valence compound containing both Fe(III) and Fe(II). It is the sulfur equivalent of the iron oxide magnetite (Fe 3 O 4 ). As established by X-ray crystallography , the S anions form a cubic close-packed lattice, and the Fe cations occupy both tetrahedral and octahedral sites.
Ferric oxalate, also known as iron(III) oxalate, refers to inorganic compounds with the formula Fe 2 (C 2 O 4) 3 (H 2 O) x but could also refer to salts of [Fe(C 2 O 4) 3] 3-. Fe 2 (C 2 O 4) 3 (H 2 O) x are coordination polymers with varying degrees of hydration.
For example, "ferrous sulfide" can refer to the 1:1 species (mineral name troilite) or a host of Fe-deficient derivatives . The mineral magnetite ("lode stone") is a mixed-valence compound with both Fe(II) and Fe(III), Fe 3 O 4 .
Anhydrous iron(III) pyrophosphate can be prepared by heating the mixture of iron(III) metaphosphate and iron(III) phosphate under oxygen with the stoichiometric ratio 1:3. The reactants can be prepared by reacting iron(III) nitrate nonahydrate with phosphoric acid .