[Sitemap] [Contact] [Imprint] Deutsche Version Search site 


Published: 14.02.2011

Manganese-Based Superhalogens

Researchers discover a new class of magic atomic clusters called superhalogens.

An international team of researchers has discovered a new class of magnetic superhalogens – a class of atomic clusters able to exhibit unusual stability at a specific size and composition, which may be used to advance materials science by allowing scientists to create a new class of salts with magnetic and super-oxidizing properties not previously found.

The discovery, which was published Feb. 10, 2011, in the Early View issue of the international chemistry journal Angewandte Chemie International Edition, was based on theoretical work by researchers from Virginia Commonwealth University, McNeese State University, and Peking University in China, and experimental work at Johns Hopkins University.

Unlike conventional superhalogens that are composed of a metal atom at the core and surrounded by halogen atoms, the magnetic superhalogens discovered by this team are composed of stoichiometric metal-halogen moieties at the core to which an additional halogen is attached.

Manganese superhalogens

Magnetic superoxidizers: A series of magnetic superhalogens formed of (MnxCl2x+1)- units has been discovered (see picture; Mn violet, Cl green). The series was characterized by photoelectron spectroscopy, mass spectrometry, and theoretical studies.

[Credit: Angewandte Chemie International Edition]

The new chemical species known as magnetic superhalogens mimic the chemistry of halogens which are a class of elements from the periodic table, namely, iodine, astatine, bromine, fluorine and chlorine. The word halogen means "salt-former," and when one of the elements above combines with sodium, they can form a salt.

Specifically, the cluster is MnxCl2x+1, where x = 1, 2, 3, and so on, have manganese and chlorine atoms as a core to which only one chlorine atom is attached. The manganese atoms carry a large magnetic moment and therefore make these superhalogens magnetic.

"One can now design and synthesize yet unknown magnetic superhalogens by changing the metal atom from manganese to other transition metal atoms and changing chlorine to other halogen atoms. In addition to their use as oxidizing agents, being magnetic opens the door to the synthesis a new class of salts," said lead investigator Puru Jena, Ph.D., distinguished professor of physics at VCU.

According to Jena, superhalogens are like halogens, in the sense they form negative ions, but their affinity to attract electrons is far greater than those of any halogen atoms. Negative ions are useful as oxidizing agents, for purification of air and in serotonin release for uplifting mood.

"Superhalogens can do the same thing as halogens can do, only better," said Jena. "The ability of superhalogens to carry large quantities of fluorine and chlorine can be used for combating biological agents as well."

"In addition, superhalogens, due to their large electron affinity, can involve inner core electrons of metal atoms in chemical reaction, thus fundamentally giving rise to new chemistry," said Jena.

In October, Jena and his colleagues reported the discovery of a new class of highly electronegative chemical species called hyperhalogens, which use superhalogens as building blocks around a metal atom. The chemical species may have application in many industries.

Jena collaborated with researchers Qian Wang, Ph.D., with the Department of Physics at VCU; Kiran Boggavarapu, Ph.D., with the Department of Chemistry at McNeese State University, and Anil K. Kandalam, Ph.D., with the Department of Physics at McNeese State University; Qiang Sun, Ph.D., and graduate student, Miao Miao Wu, with VCU's Department of Physics at Peking University; and Haopeng Wang and Yeon Jae Ko, both graduate students, and Kit H. Bowen, Ph.D., all with the Department of Chemistry at Johns Hopkins University.

The work was supported in part by the federal Defense Threat Reduction Agency and the Department of Energy.


Further Information and Source:
Miao Miao Wu, Haopeng Wang, Yeon Jae Ko, Prof. Qian Wang, Prof. Qiang Sun, Prof. Boggavarapu Kiran, Prof. Anil K. Kandalam, Prof. Kit H. Bowen, Prof. Puru Jena:
Manganese-Based Magnetic Superhalogens.
In: Angewandte Chemie International Edition; article first published online: 10 Feb 2011
DOI: 10.1002/anie.201007205
URL: direct link
Related Information:
Publish your Press Release ...
More on the topic (background information, research articles, etc.): See top left menu bar!

Chemistry information not found? Try this form:
Custom Search

Internetchemistry 1996 - 2016 A. J. - last update 14.02.2011