Iodides


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Related to Iodides: Chlorides, Sulfides

Iodides

 

chemical compounds of iodine and other elements. The iodides of many metals are hydriodic acid salts. Typical salts are the iodides of metals in Groups I and II of the Mendeleev periodic system. Most of these are readily soluble in water (except for Agl, Cu2I2, and Hg2I2) as well as in alcohols and other polar solvents. Iodides of metals from Groups III, IV, V, and VI as well as the iodides of nonmetals (B, Si, P, As, Sb) are fusible and are even soluble in nonpolar solvents. Upon heating, these iodides readily dissociate into the element and iodine, which is used in the preparation of especially pure substances (titanium, zirconium, and many others; seeIODIDE PROCESS).

Interaction with elementary iodine is characteristic of certain iodides, as a result of which polyiodes (for example, KI3) are formed. Iodides are obtained by the direct interaction of elements, the interaction of oxides or carbonates with hydriodic acid, and by other methods. Iodides are sometimes also referred to as organic iodine derivatives (for example, CH3I—methyl iodide).

References in periodicals archive ?
Radioactive organic iodide is particularly difficult to capture and sequester and thus tends to more easily leak into the environment.
To the most conducting gel polymer electrolyte (Sample 6), lithium iodide, LiI, was added in such a way that the total weight of the iodide salts remains the same (0.12 g) in all the electrolytes.
The iodide selected for this study was 0.5 M Lil + 0.05 M [I.sub.2], the selected solvent was ACN, and the selected high-molecular additive was PEG.
According to previous work using [I.sup.(2)]CARS, halo gen bond between pyridine and perfluoroalkyl iodides in the liquid phase binary system led the ring breathing vibration frequency of pyridine blue shift by 7.8, 7.6, and 9.7 [cm.sup.-1] for 1-[C.sub.4][F.sub.9]I, 1-[C.sub.6][F.sub.13]I, and iso-[C.sub.3][F.sub.7]I, respectively [44].
Occasionally, amiodarone can also cause goiter without apparent thyroid dysfunction.7 During amiodarone metabolism in liver, large amount of iodide is released which initiates the Wolff-Chaikoff effect (blockage of thyroid iodide uptake and hormone synthesis as an adaptive response to high concentration of iodide to avoid hyperthyroidism).8
The discovery of the stable halides--chloride, iodide, bromide, and fluoride--seems to have been a French enterprise.
(14) As opposed to the thyroid gland, which selectively accumulates iodide, the mammary gland favors iodine, suggesting that different chemical forms of iodine exhibit different functions in various organs.
Many organic iodides alter rat thyroid homeostasis that may potentially lead to thyroid tumors after chronic administration (Capen 1997; Hurley et al.
The greatest reservoir of iodides is in the oceans of our planet, although present in very diluted concentrations (0.05 mcg/ml of sea water); therefore, this is not a good starting material for industrial production of iodine.
At serum levels [is greater than] 50 [micro]g/dL, rats had decreased uptake of thyroidal iodide, decreased organification, and decreased production of [T.sub.3] and [T.sub.4] from newly iodinated amino acids (21).
Medicoiodophobes suffer from: A) a split personality which results in iodophobia within the orthoiodosupple mentation range previously used safely and successfully in medical practice and iodophylia for megadoses of iodide (up to 12gm/day); B) double standards, which render those physicians intolerant to the minor side effects of the inorganic forms and extremely tolerant to the severe side effects of the radioactive and organic forms; C) amnesia pertaining to the inorganic, non-radioactive forms when making therapeutic decisions; D) confusion, attributing the severe side effects of organic iodine-containing drugs to inorganic iodine/iodide; and E) an altered state of consciousness, allowing doublethink, doublespeak, and contradictory logic to become acceptable.
"Clinical evaluation of the iodide/creatinine ratio of casual urine samples as an index of daily iodide excretion in a population study." Endocrine Journal, 1993; 40:163-169.