Zinc iodide
<templatestyles src="Chembox/styles.css"/>
Template:Chembox image cellTemplate:Chembox AllOtherNamesTemplate:Chembox headerbarTemplate:Chembox IndexlistTemplate:Chembox JmolTemplate:Chembox ChEMBLTemplate:Chembox ECHATemplate:Chembox E numberTemplate:Chembox IUPHAR ligandTemplate:Chembox UNIITemplate:Chembox CompToxTemplate:Chembox headerbarTemplate:Chembox SolubilityInWaterTemplate:Chembox headerbarTemplate:Chembox headerbarTemplate:Chembox SDSTemplate:Chembox headerbarTemplate:Chembox Datapage checkTemplate:Chembox Footer| Template:Longitem | Template:Unbulleted list |
| ChEBI | Template:Unbulleted list |
| ChemSpider | Template:Unbulleted list |
| DrugBank | Template:Unbulleted list |
| EC Number | Template:Unbulleted list |
| KEGG | Template:Unbulleted list |
| Template:Longitem | Template:Unbulleted list |
| RTECS number | Template:Unbulleted list |
| Script error: No such module "collapsible list". | |
| Script error: No such module "collapsible list". | |
| Template:Longitem | ZnI2 |
| Molar mass | 319.19 g/mol |
| Appearance | white solid |
| Density | 4.74 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Template:Longitem | −98.0·10−6 cm3/mol |
| Template:Longitem | Tetragonal, tI96 |
| Template:Longitem | I41/acd, No. 142 |
| Flash point | Template:Chembox CalcTemperatures |
| Template:Longitem | Zinc fluoride Zinc chloride Zinc bromide |
| Template:Longitem | Cadmium iodide Mercury(I) iodide |
Template:Chembox Footer/trackingScript error: No such module "TemplatePar".Template:Short description
Zinc iodide is the inorganic compound with the formula ZnI2. It exists both in anhydrous form and as a dihydrate. Both are white and readily absorb water from the atmosphere. It has no major application.
Preparation
It can be prepared by the direct reaction of zinc and iodine in water[1][2] or refluxing ether:[3]
- Zn + I2 → ZnI2
Absent a solvent, the elements do not combine directly at room temperature.[4]
Structure as solid, gas, and in solution
The structure of solid ZnI2 is unusual relative to the dichloride. While zinc centers are tetrahedrally coordinated, as in ZnCl2, groups of four of these tetrahedra share three vertices to form “super-tetrahedra” of composition {Zn4I10}, which are linked by their vertices to form a three-dimensional structure.[5] These "super-tetrahedra" are similar to the P4O10 structure.[5][6]
Molecular ZnI2 is linear as predicted by VSEPR theory with a Zn-I bond length of 238 pm.[5]
In aqueous solution the following have been detected: Zn(H2O)62+, [ZnI(H2O)5]+, tetrahedral ZnI2(H2O)2, ZnI3(H2O)−, and ZnI42−.[7]
Applications
- Zinc iodide is often used as an x-ray opaque penetrant in industrial radiography to improve the contrast between the damage and intact composite.[8][9]
- United States patent 4,109,065 [10] describes a rechargeable aqueous zinc-halogen cell that includes an aqueous electrolytic solution containing a zinc salt selected from the class consisting of zinc bromide, zinc iodide, and mixtures thereof, in both positive and negative electrode compartments.
- In combination with osmium tetroxide, ZnI2 is used as a stain in electron microscopy.[11]
- As a Lewis acid, zinc iodide catalyzes for the conversion of methanol to triptane and hexamethylbenzene.[12]
- It can be used as a topical antiseptic.[13]
References
<templatestyles src="Reflist/styles.css" />
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:Cite video
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ <templatestyles src="Citation/styles.css"/>Template:Citation/make link, Will, F. G.; Secor, F. W., "Rechargeable aqueous zinc-halogen cell", issued Script error: No such module "auto date formatter"., assigned to General ElectricScript error: No such module "Check for unknown parameters".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".
Script error: No such module "Navbox". Template:Navbox top