Method for Preparation of Carborane Anions

It is generally known that salts of the twelve-vertex carbonane anion CB11H12 serve as starting materials for the preparation of partially and fully substituted anions of type CB11XnH12.  These latter anions are used in catalysts, for materials used in lithium cation battery electrolytes and in radioactive waste treatment materials.  Until the present time, the high cost of the starting material CB11H12, has discouraged commercial use of these highly promising anions.  Presently this starting material is sold commercially by one company.  Using an expensive precursor, decarborane, the process used is expensive, difficult to scale up, and performed in small batches.

University of Nevada, Reno and University of Colorado researchers have developed a new process to economically produce weakly coordinating, icosahedral carborane anion CB11H12-. Previously, the expense of the CB11H12- anion prohibited it application. Now, the large-scale application of this new family of ionic materials with unique properties, including solubility in nonpolar solvents, inertness, and improved conductivity in anhydrous applications, is possible.

The above mentioned properties suggest use in conductive polymers, membranes, gels, and other ionic conductors frequently used in batteries and fuel cells. Polymerization and other cationic catalysts used in conjunction with CB11H12- anion or derivatives thereof exhibit enhanced activity. The CB11H12- anion also exhibits tunable reduction/oxidation behavior, useful in magnetic applications and organic synthesis.

IP Status
UNR ID#: UNR01-001
Method for Preparation of Carborane Anions

Patent No.: 7,161,040

Patent Information:
For Information, Contact:
Dan Langford
Technology Commercialization, Manager
University of Nevada, Reno and Desert Research Institute
Andreas Franken
Benjamin King
Josef Michl