Cobalt(II) iodide - Citizendia

Cobalt(II) iodide
IUPAC name	Cobalt(II) iodide
Other names	cobaltous iodide, cobalt diiodide
Identifiers
CAS number	[15238-00-3]
Properties
Molecular formula	CoI₂
Molar mass	312. IUPAC Nomenclature is a system of naming Chemical compounds and of describing the science of Chemistry in general CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Molar mass, symbol M, is the Mass of one mole of a substance ( Chemical element or Chemical compound) 742 g/mol
Appearance	α-form: black hexagonal crystal β-form: yellow powder
Density	α-form: 5. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 584 g/cm³ β-form: 5. 45 g/cm³
Melting point	α-form: 515-520°C under vacuum β-form: converts to α-form at 400°C
Solubility in water	67. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. Water is a common Chemical substance that is essential for the survival of all known forms of Life. 0 g/100 mL^[1]
Hazards
EU classification	Harmful (Xn)
NFPA 704	0 1 1
R-phrases	R20/21/22, R36/37/38
S-phrases	S26, S36^[2]
Related compounds
Other anions	Cobalt(II) fluoride Cobalt(II) chloride Cobalt(II) bromide
Other cations	Nickel(II) iodide Copper(I) iodide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Cobalt(II) iodide or cobaltous iodide is the chemical compound composed of cobalt and iodine with the formula CoI₂. Council Directive 67/548/EEC of 27 June 1967 on the approximation of laws regulations and administrative provisions relating to the classification packaging and labelling Symbolism The four divisions are typically color-coded with blue indicating level of Health Hazard, red indicating R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge Cobalt(II fluoride (CoF2 is a pink crystalline solid compound used in oxygen-sensitive fields namely metal Cobalt(II chloride is the Chemical compound with the formula Co[[chlorine Cl2]] although the term is used also to refer to the hexahydrate which Cobalt(II bromide is the bromide salt of divalent cobalt Properties Cobalt(II bromide appears as green crystals An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge Copper(I iodide is the Chemical compound with the formula CuI it is also known as cuprous iodide. In Chemistry, the standard state of a material is its state at 1 bar (100 Kilopascals exactly A chemical compound is a substance consisting of two or more different elements chemically bonded together in a fixed proportion by Mass. Cobalt (ˈkoʊbɒlt is a hard lustrous silver-grey Metal, a Chemical element with symbol Co. Iodine (ˈaɪədaɪn ˈaɪədɪn or /ˈaɪədiːn/ from ιώδης iodes "violet" is a Chemical element that has the symbol I and Atomic A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes This hygroscopic crystalline solid is a laboratory reagent used to test for the presence of water in organic solvents or in the atmosphere^[3]. A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. A solvent is a liquid or gas that dissolves a solid liquid or gaseous Solute, resulting in a Solution. When anhydrous cobalt(II) iodide is added to solvents such as alcohols, ketones, and nitriles, it will turn pick in the presence of water^[4]. In Chemistry, an alcohol is any Organic compound in which a Hydroxyl group ( - O[[hydrogen H]]) is bound to a Carbon A ketone (pronounced as key tone) is either the Functional group characterized by a Carbonyl group (O=C linked to two other Carbon atoms or A nitrile is any Organic compound which has a - C ≡ N Functional group.

Forms

Cobalt(II) iodide exists in two distinct forms, the α- and β-forms. The α-form consists of black hexagonal crystals which turn dark green when exposed to air. The β-form is a yellow powder which readily absorbs moisture from the air, converting into green droplets. When placed in a vacuum, the α-form sublimes, forming the β-form. This vacuum means "absence of matter" or "an empty area or space" for the cleaning appliance see Vacuum cleaner. When the β-form is heated to 400°C, it converts to the α-form.

Reactions

Cobalt(II) iodide is formed by heating elemental cobalt in the presence of gaseous hydrogen iodide or elemental iodine vapor^[3]. This page is about the physical properties of gas as a state of matter Hydrogen iodide (HI is a Diatomic molecule. Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a Strong acid.

Cobalt(II) iodide has been used as a catalyst in the reaction of diketene with Grignard reagents in the synthesis of terpenoids^[5]. Diketene is an Organic compound formed by Dimerization of Ketene. The Grignard reaction, named for the French chemist François Auguste Victor Grignard, is an organometallic Chemical reaction in which Alkyl - The terpenoids, sometimes referred to as isoprenoids, are a large and diverse class of naturally-occurring organic chemicals similar to Terpenes derived

References

^ Perry, Dale L. & Phillips, Sidney L. , Handbook of Inorganic Compounds, San Diego: CRC Press, pp. 127-8, ISBN 0849386713, <http://books.google.com/books?id=0fT4wfhF1AsC&pg=PA128&dq=%22Cobalt(II)+iodide%22&sig=xjN_iy-hte1LQmDXwd0lZ9DOIQw#PPA127,M1>. Retrieved on 2007-06-03
^ 429740 Cobalt(II) iodide anhydrous, beads, −10 mesh, 99.999%. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 350 - Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman Emperor, entering Sigma-Aldrich. Retrieved on 2008-06-03. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 350 - Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman Emperor, entering
^ ^a ^b Patnaik, Pradyot, Handbook of Inorganic Chemicals, Amsterdam: McGraw-Hill Professional, pp. 244, ISBN 0070494398, <http://books.google.com/books?id=Xqj-TTzkvTEC&pg=PA244&dq=%22Cobalt(II)+iodide%22&sig=kAuO8lJeq0SqAE46x7n4sm1iT0E>. Retrieved on 2007-06-03
^ Armarego, Wilfred L. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 350 - Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman Emperor, entering F. & Chai, Christina L. L. , Purification of Laboratory Chemicals, Butterworth-Heinemann, pp. 26, ISBN 0750675713, <http://books.google.com/books?id=SYzm1tx2z3QC&pg=PA26&dq=%22Cobalt(II)+iodide%22&as_brr=3&sig=TDGFmkL7UvLsU_zYK2MbVZiJYRI>. Retrieved on 2007-06-03
^ Agreda, V. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 350 - Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman Emperor, entering H. & Zoeller, Joseph R. , Acetic Acid and Its Derivatives, CRC Press, pp. 74, ISBN 0824787927, <http://books.google.com/books?id=3MjdGp1v1YIC&pg=RA1-PA784&dq=%22Cobalt(II)+iodide%22&as_brr=3&sig=hWuarTAI7M-FW8DbBJRRX6SiUmE>. Retrieved on 2007-06-03

Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 350 - Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman Emperor, entering

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