Cadmium iodide is the inorganic compound with the formula CdI2. It is a white hygroscopic solid. It also can be obtained as a mono- and tetrahydrate.[2] It has few applications. It is notable for its crystal structure, which is typical for compounds of the form MX2 with strong polarization effects.
Cadmium iodide is prepared by the addition of cadmium metal, or its oxide, hydroxide or carbonate to hydroiodic acid. Also, the compound can be made by heating cadmium with iodine.[2]
Crystal structureEdit
The iodide anions in CdI2 form a hexagonal close-packed lattice, while the cadmium cations occupy all of the octahedral holes in alternating layers.
In cadmium iodide the iodideanions form a hexagonal close packed arrangement while the cadmium cations fill all of the octahedral sites in alternate layers. The resultant structure consists of a layered lattice. This same basic structure is found in many other salts and minerals. Cadmium iodide is mostly ionically bonded but with partial covalent character.[3]
Cadmium iodide's crystal structure is the prototype on which the crystal structures many other compounds can be considered to be based. Compounds with any of the following characteristics tend to adopt the CdI2 structure:[citation needed]
cadmium, iodide, inorganic, compound, with, formula, cdi2, white, hygroscopic, solid, also, obtained, mono, tetrahydrate, applications, notable, crystal, structure, which, typical, compounds, form, with, strong, polarization, effects, namesiupac, name, cadmium. Cadmium iodide is the inorganic compound with the formula CdI2 It is a white hygroscopic solid It also can be obtained as a mono and tetrahydrate 2 It has few applications It is notable for its crystal structure which is typical for compounds of the form MX2 with strong polarization effects Cadmium iodide NamesIUPAC name Cadmium II iodideOther names Cadmium diiodideIdentifiersCAS Number 7790 80 9 Y3D model JSmol Interactive imageChemSpider 23037 YECHA InfoCard 100 029 294EC Number 232 223 6PubChem CID 277692UNII 2F2UPU4KCW YCompTox Dashboard EPA DTXSID20894887InChI InChI 1S Cd 2HI h 2 1H q 2 p 2 YKey OKIIEJOIXGHUKX UHFFFAOYSA L YInChI 1 Cd 2HI h 2 1H q 2 p 2Key OKIIEJOIXGHUKX NUQVWONBAZSMILES Cd 2 I I PropertiesChemical formula CdI2Molar mass 366 22 g molAppearance white to pale yellow crystalsDensity 5 640 g cm3 solidMelting point 387 C 729 F 660 K Boiling point 742 C 1 368 F 1 015 K Solubility in water 787 g L 0 C 847 g L 20 C 1250 g L 100 C Solubility soluble in ethanol acetone ether and ammoniaMagnetic susceptibility x 117 2 10 6 cm3 molStructureCrystal structure Trigonal hP3 space group P3 m1 No 164Coordination geometry octahedralHazardsGHS labelling PictogramsSignal word DangerHazard statements H301 H331 H351 H373 H410Precautionary statements P260 P280 P301 P330 P331 P304 P340 P310 P311 P403 P233NFPA 704 fire diamond 300NIOSH US health exposure limits PEL Permissible 1910 1027 TWA 0 005 mg m3 as Cd 1 REL Recommended Ca 1 IDLH Immediate danger Ca 9 mg m3 as Cd 1 Related compoundsOther anions cadmium fluoridecadmium chloridecadmium bromideOther cations zinc iodidemercury II iodideExcept where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa Y verify what is Y N Infobox referencesPreparation EditCadmium iodide is prepared by the addition of cadmium metal or its oxide hydroxide or carbonate to hydroiodic acid Also the compound can be made by heating cadmium with iodine 2 Crystal structure Edit The iodide anions in CdI2 form a hexagonal close packed lattice while the cadmium cations occupy all of the octahedral holes in alternating layers In cadmium iodide the iodide anions form a hexagonal close packed arrangement while the cadmium cations fill all of the octahedral sites in alternate layers The resultant structure consists of a layered lattice This same basic structure is found in many other salts and minerals Cadmium iodide is mostly ionically bonded but with partial covalent character 3 Cadmium iodide s crystal structure is the prototype on which the crystal structures many other compounds can be considered to be based Compounds with any of the following characteristics tend to adopt the CdI2 structure citation needed Iodides of moderately polarising cations bromides and chlorides of strongly polarising cations Hydroxides of dications i e compounds with the general formula M OH 2 Sulfides selenides and tellurides chalcogenides of tetracations i e compounds with the general formula MX2 where X S Se TeReferences Edit a b c NIOSH Pocket Guide to Chemical Hazards 0087 National Institute for Occupational Safety and Health NIOSH a b F Wagenknecht R Juza 1963 Cadmium iodide In G Brauer ed Handbook of Preparative Inorganic Chemistry 2nd Ed Vol 2 NY NY Academic Press p 1096 Greenwood Norman N Earnshaw Alan 1997 Chemistry of the Elements 2nd ed Butterworth Heinemann pp 1211 1212 ISBN 978 0 08 037941 8 Retrieved from https en wikipedia org w index php title Cadmium iodide amp oldid 1157941533, wikipedia, wiki, book, books, library,
