pseudohalogen

Pseudohalogens are binary inorganic compounds of the general form XY, where X is a cyanide, cyanate, thiocyanate etc. group and Y is any of X, or a true halogen. Not all combinations are known to be stable. Examples include cyanogen, (CN)2, and iodine cyanide, ICN. These anions behave as halogens and the presence of the internal double bonds or triple bonds do not appear to affect their chemical behavior.

Nanoclusters of aluminium (often referred to as superatoms) are sometimes considered to be pseudohalogens since they, too, behave chemically as halide ions, forming Al13I2 (analogous to I3) and similar compounds. This is due to the effects of metallic bonding on small scales.

Another complex pseudohalogen is dicobalt octacarbonyl, Co2(CO)8. This substance can be considered as a dimer of the hypothetical cobalt tetracarbonyl, Co(CO)4. It can easily be reduced to the "pseudo-halide", Co(CO)4-. The acid HCo(CO)4 is in fact quite a strong acid, though its low solubility renders it not as strong as the true hydrohalic acids.

References

  • New Scientist, issue 2495 (16th April 2005), pp30-33, "A new kind of alchemy", Philip Ball.
inorganic compounds are considered to be of mineral, not biological, origin. Complementarily, most organic compounds are traditionally viewed as being of biological origin.
..... Click the link for more information.
Editing of this page by unregistered or newly registered users is currently disabled.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or .
..... Click the link for more information.
cyanide ion, CN.
From the top:
1. Valence-bond structure
2. Space-filling model
3. Electrostatic potential surface
4. 'Carbon lone pair' HOMO]] A cyanide
..... Click the link for more information.
cyanate ion is an anion consisting of one oxygen atom, one carbon atom, and one nitrogen atom, [OCN], in that order, and possesses 1 unit of negative charge, borne mainly by the nitrogen atom. In organic compounds the cyanate group is a functional group.
..... Click the link for more information.
Thiocyanate (also known as sulphocyanate or thiocyanide) is the anion, [SCN]. Common compounds include the colourless salts potassium thiocyanate and sodium thiocyanate.
..... Click the link for more information.
halogens or halogen elements are a series of nonmetal elements from Group 17 (old-style: VII or VIIA; Group 7 IUPAC Style) of the periodic table, comprising fluorine, F; chlorine, Cl; bromine, Br; iodine, I; and astatine, At.
..... Click the link for more information.
Cyanogen is the chemical compound with the formula (CN)2. It is a colorless, toxic gas with a pungent odor. The molecule is a pseudohalogen. Cyanogen molecules consist of two CN groups (analogous to diatomic halogen molecules, such as Cl2
..... Click the link for more information.
Iodine cyanide, ICN, is a pseudohalogen composed of iodine and the cyanide group. It is toxic, and occurs as white crystals that melt at 146−147 °C. It reacts with water to form hydrogen cyanide.
..... Click the link for more information.
halogens or halogen elements are a series of nonmetal elements from Group 17 (old-style: VII or VIIA; Group 7 IUPAC Style) of the periodic table, comprising fluorine, F; chlorine, Cl; bromine, Br; iodine, I; and astatine, At.
..... Click the link for more information.
Covalent bonding is a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms, or between atoms and other covalent bonds.
..... Click the link for more information.
Covalent bonding is a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms, or between atoms and other covalent bonds.
..... Click the link for more information.
Aluminium (IPA: /ˌæljʊˈmɪniəm/, /ˌæljəˈmɪniəm/) or aluminum (IPA: /əˈluːmɪnəm/
..... Click the link for more information.
Superatoms are clusters of atoms that seem to exhibit some of the properties of elemental atoms.

Sodium atoms, when cooled from vapor, naturally condense into clusters, more so into clusters of 2, 8, 20, 40, 58 or 92 atoms (the magic numbers), than into the other numbers.
..... Click the link for more information.
A halide is a binary compound, of which one part is a halogen atom and the other part is an element or radical that is less electronegative than the halogen, to make a fluoride, chloride, bromide, iodide, or astatide compound. Many salts are halides.
..... Click the link for more information.
Metallic bonding is the bonding between atoms within metals. It involves the delocalized sharing of free electrons among a lattice of metal atoms. Thus, metallic bonds may be compared to molten salts.
..... Click the link for more information.
Dicobalt octacarbonyl is the chemical compound Co2(CO)8. This metal carbonyl is a versatile reagent in organometallic chemistry and organic synthesis.[1] It continues to be used as a catalyst for hydroformylation catalysis.
..... Click the link for more information.
dimer refers to a molecule composed of two identical subunits or monomers linked together.

Chemistry

The molecules in a dimer are connected by covalent bonds or weaker interactions such as hydrogen bonds.
..... Click the link for more information.
Hypothetical is an adjective, meaning of or pertaining to a hypothesis. See:
  • Hypothesis
  • Hypothetical
  • Hypothetical (album)
    ..... Click the link for more information.
In common parlance, the prefix pseudo is used to mark something as false, fraudulent, or pretending to be something it is not, as in pseudoscience or pseudophilosophy. In referring to a person, the term "pseudo" is generally understood to mean "pseudointellectual".
..... Click the link for more information.
A halide is a binary compound, of which one part is a halogen atom and the other part is an element or radical that is less electronegative than the halogen, to make a fluoride, chloride, bromide, iodide, or astatide compound. Many salts are halides.
..... Click the link for more information.
Dicobalt octacarbonyl is the chemical compound Co2(CO)8. This metal carbonyl is a versatile reagent in organometallic chemistry and organic synthesis.[1] It continues to be used as a catalyst for hydroformylation catalysis.
..... Click the link for more information.
ACID (Atomicity, Consistency, Isolation, Durability) is a set of properties that guarantee that database transactions are processed reliably. In the context of databases, a single logical operation on the data is called a transaction.
..... Click the link for more information.
Solubility is a physical property referring to the ability for a given substance, the solute, to dissolve in a solvent.[1] It is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium. The resulting solution is called a saturated solution.
..... Click the link for more information.
Hydrogen halides (or hydrohalic acids) are acids resulting from the chemical reaction of hydrogen with one of the halogen elements (fluorine, chlorine, bromine, iodine), which are found in group VII of the periodic table.
..... Click the link for more information.


This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.