Synthesis of iodine pentoxide (iodic anhydride)

Preparation of iodine pentoxide

Preparation of iodine pentoxide (iodic anhydride) from iodine

Iodine pentoxide is prepared by oxidizing iodine with nitric acid. Intermediate product iodic acid is converted to iodine pentoxide by dehydrating iodic acid at 200° C.

Preparation of iodine pentoxide (iodic anhydride) from iodine

Preparation of iodine pentoxide (iodic anhydride) from iodine

32 g iodine are placed in a distillation flask fitted with an air condenser (50-100 cm long) and a glass tube for introducing air. 130 ml of concentrated nitric acid-free from nitrogen oxides is poured to distillation flask and on shaking a reaction takes place which is hastened by moderate heating. The reaction mixture is heated until all iodine is oxidized and when the reaction is complete the red vapors of nitrogen dioxide are removed by passing a strong current of air, which is blown into the reaction flask through a glass tube. The flask is cooled to room temperature and filtered. Collected iodic acid is dissolved in a small amount of water and left to crystallize in a vacuum desiccator over concentrated sulfuric acid. In order to obtain iodine pentoxide dry iodic acid is dehydrated at 180-200° C, until all water is removed.

Laboratory manual of inorganic preparations, by H. T. Vulte, 123, 1895

Preparation of iodine pentoxide (iodic anhydride) from potassium iodate

Preparation of iodine pentoxide (iodic anhydride) from potassium iodate

Preparation of iodine pentoxide (iodic anhydride) from potassium iodate

43 grams of potassium iodate and 26 grams of barium nitrate are dissolved separately, each in 250 ml of hot water. Both solutions are mixed at the boiling temperature with proper stirring. The mixture is cooled and the heavy precipitate of barium iodate are settled, decanted, and washed twice by decantation with pure water. Further, the barium iodate is filtered and washed on the filter with cold water. The obtained salt is placed in a porcelain casserole, suspended in 250 ml of water, heated to boiling, and mixed while stirring with a solution of 8 ml concentrated sulfuric acid in 100 ml of water. To complete the reaction and obtain iodic acid, this mixture is boiled with well stirring for at least 10 minutes. The solution is filtered in order to remove barium sulfate, which is additionally rinsed two or three times with small portions of water. The filtrate containing iodic acid is evaporated to a small volume and the evaporation is continued until solid iodic acid separates in some quantity. The residue is cooled completely and the obtained crystals are rinsed with three successive portions of 10 ml each of concentrated nitric acid by triturating the crystals thoroughly with each portion of the acid. The iodic acid is carefully heated until the product is perfectly dry and ceases to give off acid vapors. This warming converts the iodic acid to a large extent into the anhydride iodine pentoxide. To obtain completely anhydrous iodine pentoxide, the product could be heated for some time in an oven at about 200° C. Crystallized iodic acid could be obtained by dissolving the product in a very little water, in which it is extremely soluble, and allowing the solution to evaporate slowly.

Synthetic inorganic chemistry, by A. A. Blanchard, 249-251, 1936

IUPAC Name

iodyl iodate

InChI

InChI=1S/I2O5/c3-1(4)7-2(5)6

InChI Key

BIZCJSDBWZTASZ-UHFFFAOYSA-N

Canonical SMILES

O=I(=O)OI(=O)=O

MeSH Synonyms

I2O5 cpd, iodine pentoxide

Depositor-Supplied Synonyms

Iodine pentoxide, Iodic anhydride, iodyl iodate, Iodopentoxide, 12029-98-0, Diiodine pentoxide, 7790-35-4, Iodine oxide (I2O5), Iodine(V) oxide, Diiodine pentaoxide, AC1L4LRL, AC1Q6QYZ, O2IOIO2, UNII-UPU35C0Q0N, mu-oxido-bis(dioxidoiodine), UPU35C0Q0N, 229709_ALDRICH, 278890_ALDRICH, CHEBI:29914, CTK5E5149, MolPort-003-925-281, LTBB002660, EINECS 234-740-2, AKOS015903656, TR-003368, 3B4-2350, I14-17939

Removed Synonyms

CID159402

IUPAC Name

iodic acid

InChI

InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)

InChI Key

ICIWUVCWSCSTAQ-UHFFFAOYSA-N

Canonical SMILES

OI(=O)=O

MeSH Synonyms

iodic acid, iodic acid, 131I-labeled, iodic acid, lead (2+) salt, iodic acid, lithium salt, iodic acid, magnesium salt, iodic acid, mercury (2+) salt, iodic acid, potassium (2:1) salt, iodic acid, rubidium salt, iodic acid, sodium salt, 125I-labeled, iodic acid, strontium salt

Depositor-Supplied Synonyms

Iodic acid, 7782-68-5, CHEBI:24857, Iodic acid (HIO3), Iodicacid, Iodsaeure, Monoiodic acid, trioxoiodic acid, Iodic(V) acid, Sodium Iodate Min, hydrogen trioxoiodate, hydroxidodioxidoiodine, Caswell No. 499A, ACMC-20akq9, HOIO2, IODIC ACID, ACS, AC1L2NDE, HIO3, IODIC ACID, HIO3, UNII-6U8J18JSBM, 6U8J18JSBM, KSC377K6B, hydroxy-lambda(5)-iodanedione, CHEMBL1161636, [IO2(OH)], 58060_FLUKA, CTK2H7560, ICIWUVCWSCSTAQ-UHFFFAOYSA-N, MolPort-001-789-648, 58060_SIAL, 7790-32-1 (magnesium salt), 13446-76-9 (rubidium salt), 13765-03-2 (lithium salt), 221929_SIAL, 13470-01-4 (strontium salt), EINECS 231-962-1, AKOS015902399, EPA Pesticide Chemical Code 046902, RL04995, RTR-033706, 7783-32-6 (mercury(2+) salt), 25659-31-8 (lead(2+) salt), 13455-24-8 (potassium salt[2:1]), AB1006870, TR-024577, 3B4-4412, I14-19724

Removed Synonyms

null, CHEBI:29906, Iodic acid (HIO3), lithium salt, CID24345, CID5360296, 7681-55-2

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