[CCoE Notice] ChBE Seminar: Ordered Organic Self-assemblies and Metal-organic Complexes at Surfaces

[Grayson, Audrey A]

ChBE Dept. Seminar
10:30am-11:30am, Friday, January 24, 2014
Rm W122
Ordered Organic Self-assemblies and Metal-organic Complexes at Surfaces
Steven L Tait
Indiana University

ABSTRACT: The ordering of small molecules, programmed with functional groups for specific non-covalent interactions, can lead to robust, dynamic, and functional monolayers or thin films. Our group studies these assemblies under well-controlled environments by atomic-resolution scanning tunneling microscopy and non-contact atomic force microscopy (structural characterization), X-ray photoelectron spectroscopy (chemical characterization), and high-resolution electron energy loss spectroscopy (vibrational spectroscopy). These studies allow new insights in the roles of ionic bonding, donor-acceptor stacking, transition metal coordination, dipole interactions, and van der Waals interactions in two-dimensional assembly, as well as in the formation of crystalline organic thin films and novel metal-organic complexes at surfaces. In this presentation, new discoveries from our lab will be shown that push the frontiers of these well-ordered nanostructure systems, including highly robust 2D architectures (stable to 180 C), chemical stability by interfacial layer design, surprisingly crystalline multilayers through surface templating and donor-acceptor stacking, chemically-triggered switching of dynamic supramolecular structures (at the liquid-solid interface), and well-defined single site transition metal complexes. These studies open new opportunities in designing organic and metal-organic materials for electronics, photovoltaics, and catalysts.


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