[Todos] Seminario DQIAQF - INQUIMAE - Lunes 13 de setiembre - 13hs.

[andrea en qi.fcen.uba.ar]

Seminario 13 de Setiembre de 2010 - 13 hs.


Aula de Seminarios INQUIMAE - DQIAQF
Facultad de Ciencias Exactas y Naturales
Ciudad Universitaria - Pab. 2  -  Piso 3



Dr. Anna S. Larsen
Associate Professor
Department of Chemistry, Ithaca College, Ithaca
NY USA

Título:  Carboranes for Organometallic Ruthenium Chemistry and Low-melting
Ionics.


ABSTRACT:
      Two main areas of our research  are low-melting ionic compounds and
organometallic chemistry of ruthenium nitrosyl complexes.  These two themes
are united  by our interest in applications of carbon-boron cluster anions,
based on closo-carborane CB11 and ortho-carboranes C2B9 parent fragments.
Carborane anions have a number of unique properties: on one hand, they are
extremely inert and non-coordinating.  On the other, they can be
derivatized
and tailored for specific applications (for example, to improve solubility
or polarity).  Most modern homogeneous catalysts are based on cationic
transition metal complexes, and thus follows the importance of the
suitable
anion that would not block the reactive metal center.  Carboranes are
perfectly poised to address this issue.  We are currently working on
developing catalytically active ruthenium-based cationic systems coupled
with carborane anions.
The second area of our research is centered on low-melting ionic
compounds,
also called ionic liquids. Ionic liquids have attracted much attention
recently as possible environmentally benign alternative to the organic
solvents used in various chemical technological processes. Our research
project is concentrated on the synthesis and characterization of the new
class of compounds: carborane-based imidazolium and pyridinium ionic
liquids. In this research we are pursuing two goals: synthesis of the new
useful materials for the practical applications, as well as studying the
fundamental structure-property relationship in terms of factors governing
low-melting behavior of these materials. The flexibility on the carborane
derivatization,as well as variety of alkyl substituents available for the
cationic portion,  allow for systematic study  of structural effects for
the
physico- chemical behavior of these materials.  Analytical techniques
applied include  Nuclear Magnetic Resonance, Infra-red and UV-vis
spectroscopy methods, along with Differential Scanning Calorimetry(DSC) and
X-ray crystallography and electrochemistry.
Finally, a very brief introduction/discussion of Liberal Arts College system
in the USA will be offered.