Everything about Disulfides totally explained
In
chemistry, a
disulfide usually refers to the structural unit composed of a linked pair of sulfur atoms. The disulfide
anion is S
22−. The term
disulfide can also refer to a
chemical compound that contains a
disulfide center, such as
diphenyl disulfide, C
6H
5S-SC
6H
5.
Sulfur is usually assigned to the
reduced oxidation number −2, described as S
2− and called
sulfide. It has the electron configuration of a
noble gas (
argon).
In disulfides, sulfur is only reduced to a state with oxidation number −1. Its configuration then resembles that of
chlorine and, like it, has the tendency to form a covalent bond with another S
− ion to form a disulfide (S
2)
2− group.
Oxygen can also do this; for example in
peroxides such as H
2O
2. In many cases, each of the two sulfur atoms in a disulfide group is covalently bonded to a carbon atom in an
organic compound, forming a
disulfide bond, sometimes called a
disulfide linkage or a
disulfide bridge.
The tendency is a bit more elaborate in the case of sulfur, which can form
polysulfides.
Some examples
|
|
|
|
|
| FeS2 unit cell |
S2Cl2 |
cystine |
lipoic acid |
Ph2S2 |
Misnomers
Disulfide is also used to refer to compounds that contain two sulfide (S
2−) centers. The compound
carbon disulfide, CS
2 is described with the structural formula for example S=C=S. This molecule isn't a disulfide in the sense that it lacks a S-S bond. Similarly,
molybdenum disulfide, MoS
2, isn't a disulfide in the sense again that its sulfur atoms are not linked.
Further Information
Get more info on 'Disulfides'.
|
External Link Exchanges
Do you know how hard it is to get a link from a large encyclopaedia? Well we're different and will prove it. To get a link from us just add the following HTML to your site on a relevant page:
<a href="http://disulfide.totallyexplained.com">Disulfide Totally Explained</a>
Then simply click through this link from your web page. Our crawlers will verify your link, extract the title of your web page and instantly add a link back to it. If you like you can remove the words Totally Explained and embed the link in article text.
As long as your link remains in place, we'll keep our link to you right here. Please play fair - our crawlers are watching. Your site must be closely related to this one's topic. Any kind of spamming, dubious practises or removing the link will result in your link from us being dropped and, potentially, your whole site being banned. |
