Krishna Pandey, Ph.D. Postdoctoral Research Associate for Dr. Xiaocun Lu’s Research Group at Clarkson University will speak on:
The complex self-assembly of molecular building blocks is often facilitated by noncovalent interactions. Among these, hydrogen bonding, π−π stacking, and van der Waals interactions are most employed in constructing higher order structures within synthetic chemistry and structural biology. An emerging alternative to these traditional noncovalent interactions is the use of secondary interactions involving hypervalent iodine, which can be used for the preparation of functional materials. Hypervalent iodine based benziodazoles can self-assemble into unique Hypervalent Iodine Macrocycles (HIMs) through dynamic secondary bonding. This presentation will focus on recent advances from our work on the synthesis and characterization of new classes of HIMs, including πextended HIMs, as well as their interactions with anions and the reversibility of these processes. Our results demonstrated that there is not only free interchange of monomers among different macrocycles in solution, but the macrocycles can be reversibly disassembled and reassembled by the addition or removal of anions, respectively. Moreover, we demonstrated that HIMs can coordinate with alkali metals, such as lithium and sodium, to form higher-order metal-coordinated hypervalent iodine-based macrocyclic complexes. Additionally, we investigated the supramolecular assembly of naphthalene-based HIMs with Buckminsterfullerene (C60), resulting in the formation of extended, long-range columnar supramolecular architectures.
Friday, February 28, 2054, 3:30 PM, BH Snell Hall 214Potsdam Campus
Zoom Information: Link
Meeting ID: 950 1099 7564
Passcode: chemistry