Trans-Dichlorobis(ethylenediamine)cobalt(III) chloride

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trans-Dichlorobis(ethylene­diamine)cobalt(III) chloride
Trans-dichlorobis(ethylendiamin)cobalt(III)-chlorid.png
Trans dichloribis(ethylenediamine)cobalt(III) chloride.jpg
Names
IUPAC name
(OC-6-12′)-Dichloridobis(ethane-1,2-diamine-κ2N,N′)cobalt(1+) chloride(1−)
Identifiers
3D model (JSmol)
PubChem CID
  • InChI=1S/2C2H8N2.3ClH.Co/c2*3-1-2-4;;;;/h2*1-4H2;3*1H;/q;;;;;+3/p-3
    Key: GVMSQWCTZLHSQH-UHFFFAOYSA-K
  • C(CN)N.C(CN)N.Cl[Co](Cl)Cl
Properties
C4H16Cl3CoN4
Molar mass 285.48 g·mol−1
Appearancegreen solid
Melting point decomposes
good
Hazards
GHS labelling:
GHS-pictogram-exclam.svg
Warning
H315, H319, H335
P261, P305+P351+P338
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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trans-Dichlorobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCl2(en)2]Cl (en = ethylenediamine). It is a green diamagnetic solid that is soluble in water. It is the monochloride salt of the cationic coordination complex [CoCl2(en)2]+. One chloride ion in this salt readily undergoes ion exchange but the two other chlorides are less reactive, being bound to the metal center. The more stable cis-dichlorobis(ethylenediamine)cobalt(III) chloride is also known.

Contents

Synthesis

The compound is synthesized by the reaction of cobalt(II) chloride and ethylenediamine in hydrochloric acid in the presence of oxygen:

4 CoCl2 + 8 en + 4 HCl + O2 → 4 trans-[CoCl2(en)2]Cl + 2 H2O

The initial product contains HCl, which is removed by heating. Alternatively, (carbonato)bis(ethylenediamine)cobalt(III) chloride reacts with hydrochloric acid at 10 °C to give the same species. [1]

[Co(CO3)(en)2]Cl + 2 HCl → trans-[CoCl2(en)2]Cl + CO2 + H2O
UV-vis spectra of various stages in the conversion of trans-[CoCl2(en)2] to the cis isomer. Ultraviolet-visible spectroscopy of Dichlorobis(ethylenediamine)cobalt(III) chloride.png
UV-vis spectra of various stages in the conversion of trans-[CoCl2(en)2] to the cis isomer.

This salt is more soluble than cis-dichlorobis(ethylenediamine)cobalt(III) chloride. This pair of isomers were significant in the development of the area of coordination chemistry. [2] The chiral cis isomer is obtained by heating the trans isomer. Both isomers of dichlorobis(ethylenediamine)cobalt(III) have often been used in stereochemical studies. The trans isomer cation has idealized D2h point group symmetry, whereas the cis isomer cation has C2 symmetry.

Tris(ethylenediamine)cobalt(III) chloride in contrast to the bis(ethylenediamine) complexes does not undergo substitution.

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Iron(III) chloride describes the inorganic compounds with the formula FeCl3(H2O)x. Also called ferric chloride, these compounds are some of the most important and commonplace compounds of iron. They are available both in anhydrous and in hydrated forms which are both hygroscopic. They feature iron in its +3 oxidation state. The anhydrous derivative is a Lewis acid, while all forms are mild oxidizing agents. It is used as a water cleaner and as an etchant for metals.

<span class="mw-page-title-main">Barium chloride</span> Chemical compound

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<span class="mw-page-title-main">Manganese(II) chloride</span> Chemical compound

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<span class="mw-page-title-main">Cobalt(II) chloride</span> Chemical compound

Cobalt(II) chloride is an inorganic compound, a salt of cobalt and chlorine, with the formula CoCl
2
. The compound forms several hydrates CoCl
2
·nH
2
O
, for n = 1, 2, 6, and 9. Claims of the formation of tri- and tetrahydrates have not been confirmed. The anhydrous form is a blue crystalline solid; the dihydrate is purple and the hexahydrate is pink. Commercial samples are usually the hexahydrate, which is one of the most commonly used cobalt salts in the lab.

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<span class="mw-page-title-main">Nickel(II) chloride</span> Chemical compound

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<span class="mw-page-title-main">Metal ammine complex</span> Class of chemical compounds

In coordination chemistry, metal ammine complexes are metal complexes containing at least one ammonia ligand. "Ammine" is spelled this way for historical reasons; in contrast, alkyl or aryl bearing ligands are spelt with a single "m". Almost all metal ions bind ammonia as a ligand, but the most prevalent examples of ammine complexes are for Cr(III), Co(III), Ni(II), Cu(II) as well as several platinum group metals.

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<span class="mw-page-title-main">Tris(ethylenediamine)cobalt(III) chloride</span> Chemical compound

Tris(ethylenediamine)cobalt(III) chloride is an inorganic compound with the formula [Co(en)3]Cl3 (where "en" is the abbreviation for ethylenediamine). It is the chloride salt of the coordination complex [Co(en)3]3+. This trication was important in the history of coordination chemistry because of its stability and its stereochemistry. Many different salts have been described. The complex was first described by Alfred Werner who isolated this salt as yellow-gold needle-like crystals.

<span class="mw-page-title-main">Dichlorobis(ethylenediamine)nickel(II)</span> Chemical compound

Dichlorobis(ethylenediamine)nickel(II) is the inorganic compound with the formula NiCl2(en)2, where en = ethylenediamine. The formula is deceptive: the compound is the chloride salt of the coordination complex [Ni2Cl2(en)4]2+. This blue solid is soluble in water and some polar organic solvents. It is prepared by ligand redistribution from [Ni(en)3]Cl2 · 2 H2O and hydrated nickel chloride:

<i>cis</i>-Dichlorobis(ethylenediamine)cobalt(III) chloride Chemical compound

cis-Dichlorobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCl2(en)2]Cl (en = ethylenediamine). The salt consists of a cationic coordination complex and a chloride anion. It is a violet diamagnetic solid that is soluble in water. One chloride ion in this salt readily undergoes ion exchange, but the two other chlorides are less reactive, being bound to the metal center.

<span class="mw-page-title-main">Chloropentamminecobalt chloride</span> Cobalt compound

Chloropentamminecobalt chloride is the dichloride salt of the coordination complex [Co(NH3)5Cl]2+. It is a red-violet, diamagnetic, water-soluble salt. The compound has been of academic and historical interest.

<span class="mw-page-title-main">Bis(triphenylphosphine)platinum chloride</span> Chemical compound

Bis(triphenylphosphine)platinum chloride is a metal phosphine complex with the formula PtCl2[P(C6H5)3]2. Cis- and trans isomers are known. The cis isomer is a white crystalline powder, while the trans isomer is yellow. Both isomers are square planar about the central platinum atom. The cis isomer is used primarily as a reagent for the synthesis of other platinum compounds.

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trans-Dichlorodiammineplatinum(II) is the trans isomer of the coordination complex with the formula trans-PtCl2(NH3)2, sometimes called transplatin. It is a yellow solid with low solubility in water but good solubility in DMF. The existence of two isomers of PtCl2(NH3)2 led Alfred Werner to propose square planar molecular geometry. It belongs to the molecular symmetry point group D2h.

Nitrate chlorides are mixed anion compounds that contain both nitrate (NO3) and chloride (Cl) ions. Various compounds are known, including amino acid salts, and also complexes from iron group, rare-earth, and actinide metals. Complexes are not usually identified as nitrate chlorides, and would be termed chlorido nitrato complexes.

<span class="mw-page-title-main">Carbonatobis(ethylenediamine)cobalt(III) chloride</span> Chemical compound

Carbonatobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCO3(en)2]Cl (en = ethylenediamine). It is a red diamagnetic solid that is soluble in water. It is the monochloride salt of a cationic carbonate complex [CoCO3(en)2]+. The chloride ion in this salt readily undergoes ion exchange. The compound is synthesized by the oxidation of a mixture of cobalt(II) chloride, lithium hydroxide, and ethylenediamine in the presence of carbon dioxide:

Cobalt compounds are chemical compounds formed by cobalt with other elements.

References

  1. Springbørg, J.; Schaffer, C. E. (1973). "Dianionobis(Ethylenediamine)Cobalt(III) Complexes". Inorganic Syntheses. Vol. 14. pp. 63–77. doi:10.1002/9780470132456.ch14. ISBN   978-0-470-13245-6.
  2. Jörgensen, S.M. "Ueber Metalldiaminverbindungen" J. prakt. Chem. (in German), 1889, volume 39, page 8. doi : 10.1002/prac.18890390101