Ferric oxalate, also known as iron(III) oxalate, refers to inorganic compounds with the formula Fe2(C2O4)3(H2O)x but could also refer to salts of [Fe(C2O4)3]3-. Fe2(C2O4)3(H2O)x are coordination polymers with varying degrees of hydration. The coordination complex with the formula [Fe(C2O4)3]3- forms a variety of salts, a well-known example being potassium ferrioxalate. This article emphasizes the coordination polymers.
Structure of hydrated ferric oxalate Color code: red=O, white = H, blue = Fe, gray = C.Room temperature Mössbauer spectrum of Fe2(C2O4)3·4H2O
According to X-ray crystallography of the tetrahydrate Fe2(C2O4)3 · 4 H2O, iron is octahedral. The oxalate ligands are bridging. Some through all four oxygen atoms, some with two oxygen atoms. Half of the water is lattice water, being situated between chains of Fe oxalates. Mössbauer spectrum of Fe2(C2O4)3 · 4 H2O exhibits an isomer shift of 0.38 mm/s and a quadrupole splitting of 0.40 mm/s, suggesting a high spin Fe3+ in octahedral coordination.[1][2]
Productionedit
Ferric oxalate may be produced by reaction of iron(III) hydroxide and solution of oxalic acid:
2Fe(OH)3 + 3H2C2O4 → Fe2(C2O4)3 + 6H2O
Usesedit
Dentistryedit
Like many oxalates, ferric oxalate has been investigated as a short-term treatment for dentin hypersensitivity.[3] It is used in certain toothpaste formulations; however, its effectiveness has been questioned.[4]
Photographyedit
Ferric oxalate is used as the light-sensitive element in the Kallitype photographic printing process; and the platinotype process Platinum/Palladium Printing.
Batteriesedit
Ferric oxalate tetrahydrate has been investigated as a possible cheap material for the positive electrode of lithium-iron batteries. It can intercalate lithium ions at an average potential of 3.35 V, and has shown a sustainable capacity of 98 mAh/g.[1]
^ abAhouari, Hania; Rousse, Gwenaëlle; Rodríguez-Carvajal, Juan; Sougrati, Moulay-Tahar; Saubanère, Matthieu; Courty, Matthieu; Recham, Nadir; Tarascon, Jean-Marie (2015). "Unraveling the Structure of Iron(III) Oxalate Tetrahydrate and Its Reversible Li Insertion Capability". Chemistry of Materials. 27 (5): 1631–1639. doi:10.1021/cm5043149.
^Rousse, G.; Rodríguez-Carvajal, J. (2016). "Oxalate-mediated long-range antiferromagnetism order in Fe2(C2O4)3·4H2O". Dalton Transactions. 45 (36): 14311–14319. doi:10.1039/C6DT02740G. PMID 27539964.
^Gillam, D. G.; Newman, H. N.; Davies, E. H.; Bulman, J. S.; Troullos, E. S.; Curro, F. A. (2004). "Clinical evaluation of ferric oxalate in relieving dentine hypersensitivity". Journal of Oral Rehabilitation. 31 (3): 245–250. doi:10.1046/j.0305-182X.2003.01230.x. PMID 15025657.
^Cunha-Cruz, J.; Stout, J. R.; Heaton, L. J.; Wataha, J. C. (29 December 2010). "Dentin Hypersensitivity and Oxalates: a Systematic Review". Journal of Dental Research. 90 (3): 304–310. doi:10.1177/0022034510389179. PMC3144108. PMID 21191127.
^Barker, Timothy (2001-04-15). "Ferric Oxalate Hexahydrate". Encyclopedia of Reagents for Organic Synthesis (1 ed.). Wiley. pp. 1–4. doi:10.1002/047084289X.rn02346. ISBN978-0-471-93623-7. S2CID 225482606.
January 01, 1970
ferric, oxalate, also, known, iron, oxalate, refers, inorganic, compounds, with, formula, c2o4, could, also, refer, salts, c2o4, c2o4, coordination, polymers, with, varying, degrees, hydration, coordination, complex, with, formula, c2o4, forms, variety, salts,. Ferric oxalate also known as iron III oxalate refers to inorganic compounds with the formula Fe2 C2O4 3 H2O x but could also refer to salts of Fe C2O4 3 3 Fe2 C2O4 3 H2O x are coordination polymers with varying degrees of hydration The coordination complex with the formula Fe C2O4 3 3 forms a variety of salts a well known example being potassium ferrioxalate This article emphasizes the coordination polymers Ferric oxalate Names Systematic IUPAC name iron 3 ethanedioate 2 3 Other names Iron III oxalate Identifiers CAS Number 2944 66 3 Anhydrous Y166897 40 1 hexahydrate 3D model JSmol Interactive image ChemSpider 147789 ECHA InfoCard 100 019 047 EC Number 220 951 7 PubChem CID 168963 UNII DTJ9P8AB5L Y CompTox Dashboard EPA DTXSID10905951 InChI InChI 1S 3C2H2O4 2Fe c3 3 1 4 2 5 6 h3 H 3 4 H 5 6 q 2 3 p 6 SMILES Fe 3 Fe 3 O C O C O O O C O C O O O C O C O O Properties Chemical formula C6Fe2O12 Molar mass 375 747 g mol Appearance Pale yellow solid anhydrous Lime green solid hexahydrate Odor odorless Melting point 365 1 C 689 2 F Solubility in water slightly soluble Except where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa Infobox references Contents 1 Structure 1 1 Tetrahydrate 2 Production 3 Uses 3 1 Dentistry 3 2 Photography 3 3 Batteries 3 4 Organic synthesis 4 See also 5 ReferencesStructure editTetrahydrate edit nbsp Structure of hydrated ferric oxalate Color code red O white H blue Fe gray C nbsp Room temperature Mossbauer spectrum of Fe2 C2O4 3 4H2O According to X ray crystallography of the tetrahydrate Fe2 C2O4 3 4 H2O iron is octahedral The oxalate ligands are bridging Some through all four oxygen atoms some with two oxygen atoms Half of the water is lattice water being situated between chains of Fe oxalates Mossbauer spectrum of Fe2 C2O4 3 4 H2O exhibits an isomer shift of 0 38 mm s and a quadrupole splitting of 0 40 mm s suggesting a high spin Fe3 in octahedral coordination 1 2 Production editFerric oxalate may be produced by reaction of iron III hydroxide and solution of oxalic acid 2Fe OH 3 3H2C2O4 Fe2 C2O4 3 6H2OUses editDentistry edit Like many oxalates ferric oxalate has been investigated as a short term treatment for dentin hypersensitivity 3 It is used in certain toothpaste formulations however its effectiveness has been questioned 4 Photography edit Ferric oxalate is used as the light sensitive element in the Kallitype photographic printing process and the platinotype process Platinum Palladium Printing Batteries edit Ferric oxalate tetrahydrate has been investigated as a possible cheap material for the positive electrode of lithium iron batteries It can intercalate lithium ions at an average potential of 3 35 V and has shown a sustainable capacity of 98 mAh g 1 Organic synthesis edit Ferric oxalate hexahydrate is used with sodium borohydride for radical Markovnikov hydrofunctionalization reactions of alkenes 5 See also editA number of other iron oxalates are known Iron II oxalate Potassium ferrioxalate Sodium ferrioxalateReferences edit a b Ahouari Hania Rousse Gwenaelle Rodriguez Carvajal Juan Sougrati Moulay Tahar Saubanere Matthieu Courty Matthieu Recham Nadir Tarascon Jean Marie 2015 Unraveling the Structure of Iron III Oxalate Tetrahydrate and Its Reversible Li Insertion Capability Chemistry of Materials 27 5 1631 1639 doi 10 1021 cm5043149 Rousse G Rodriguez Carvajal J 2016 Oxalate mediated long range antiferromagnetism order in Fe2 C2O4 3 4H2O Dalton Transactions 45 36 14311 14319 doi 10 1039 C6DT02740G PMID 27539964 Gillam D G Newman H N Davies E H Bulman J S Troullos E S Curro F A 2004 Clinical evaluation of ferric oxalate in relieving dentine hypersensitivity Journal of Oral Rehabilitation 31 3 245 250 doi 10 1046 j 0305 182X 2003 01230 x PMID 15025657 Cunha Cruz J Stout J R Heaton L J Wataha J C 29 December 2010 Dentin Hypersensitivity and Oxalates a Systematic Review Journal of Dental Research 90 3 304 310 doi 10 1177 0022034510389179 PMC 3144108 PMID 21191127 Barker Timothy 2001 04 15 Ferric Oxalate Hexahydrate Encyclopedia of Reagents for Organic Synthesis 1 ed Wiley pp 1 4 doi 10 1002 047084289X rn02346 ISBN 978 0 471 93623 7 S2CID 225482606 Retrieved from https en wikipedia org w index php title Ferric oxalate amp oldid 1212772362, wikipedia, wiki, book, books, library,
