| May 24 , 2013 |
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Seminar of the School of Physical Sciences Title: Boron Beyond the Icosahedral Barrier Speaker: Sundargopal Ghosh Date: May 24, 2013 (Friday) Abstract: While large metal clusters are known with of the order of 100 atoms,
for decades the search for boron clusters with more than 12 atoms
met with little success. Hawthorne's work in the development of
polyhedral expansion chemistry pioneered the way to the synthesis
of large metallacarboranes. Ever since the chemistry of supraicosahedral
clusters has been an active research area experimentally and
computationally. The first 13-vertex metallacarborane was described
40 years ago and there only about a hundred such compounds identified.
In addition, only a handful of 14- and 15-vertex metallacarboranes, no
examples of species with 16 or more vertices in the polyhedron have
been reported. This is unfortunate, as the applications of polyhedral
borane-cluster compounds include "least-coordinating anions",
electronics, ceramics, polymers, nanomaterials, immunodiagnosis and
boron-neutron-capture therapy where the option of higher nuclearity
clusters containing boron is important. For these reasons we have
sought to isolate clusters possessing more than 15-vertices. For
boranes theoretical study on [BnHn]2-, n > 12 reveal valuable structural |
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