Carboranes


Also found in: Dictionary.

Carboranes

 

chemical compounds composed of boron, carbon, and hydrogen atoms and having the general formula BnCm Hn+m.In carboranes, the B and C atoms are arranged at the vertices of the more or less regular polyhedron; every atom of B or C is bonded to one H atom. One of the B or C atoms in carboranes can be replaced by one atom of another element, such as phosphorus, arsenic, tin, or aluminum. The state of aggregation for carboranes changes from gaseous to solid as n increases. Carboranes and their derivatives are noted for their high thermal and chemical stability. Their properties are in many ways similar to those of aromatic hydrocarbons. Carboranes are therefore capable of undergoing various transformations related to the substitution of the H atoms located at the C or B atom.Carboranes are primarily formed by the interaction of acetylene derivatives with the corresponding boranes.

The carborane B 10C2H12 is used in the preparation of different types of polymers used in solid rocket fuels and as a thermostable coating.

REFERENCES

Mikhailov, B. M. Khimiia borovodorodov. Moscow, 1967.
Zhigach, A. F., and D. S. Stasinevich. Khimiia gidridov. Leningrad, 1969.

N. I. BEKASOVA

References in periodicals archive ?
In the study, Lee and his research team used carboranes to build new drugs designed to shut off a cancer cell's energy production, which is vital for the cell's survival.
With carboranes, Lee found that the drug is able to bind 10 times more powerfully.
The reason why these drugs bind stronger to their target is because carboranes exploit a unique and very strong form of hydrogen bonding, the strongest form of interactions for drugs," Lee said.
According to Lee, this is the first study to show systematically how carboranes can improve the activity of a drug.
Carborane moieties are represented by the B--H stretching band at about 2570 [cm.
30 ppm and a distinct peak for C--H group in carborane cages ([CB.
To calculate the conversion ratios of ethynyl (--C[equivalent to]CH) and ethynylene (--ph--C[equivalent to]C--Si--) moieties to the corresponding carborane groups, a precise study of peak integration was carried out.
A carborane molecule is a cage of 10 boron atoms and two carbon atoms, and extra atoms can be attached to the cage.
Although the chemistry of carboranes as anions has a relatively long (ca 40 years) history, the first actual carborane-based "weighable and measurable" superacids (i.
In this communication we introduced into our agenda investigation of the basic features such as relative acidities and structures and stability of conjugate acids based on different carborane clusters smaller than 12-vertex [CB.
3]-substituents on the acidities of the smallest carborane acids calculated so far were investigated.
organometallics, carboranes, carbocations) or transformations that proceed through transient hypercarbon species, detailing fundamental chemistry, including reactivity, selectivity, stereochemistry, mechanistic factors and more.