Wed, Feb. 8, 2017, 4:30pm - 6:00pm
Frick Chemistry Laboratory, Taylor Auditorium
Host: Gregory Scholes
“LIVING” CRYSTALLIZATION-DRIVEN, SEEDED GROWTH APPROACHES TO FUNCTIONAL SUPRAMOLECULAR MATERIALS
Although chemical synthesis has evolved to a relatively advanced state, the ability to prepare uniform samples of materials of controlled shape, size, and structural hierarchy on a length scale from 10 nm – 100 microns is still in its relative infancy and currently remains the virtually exclusive domain of biology. In this talk a promising new route to well-defined 1D and 2D materials within this size regime, termed “living crystallization-driven living self-assembly” (CDSA), will be described. The “seeded growth” characteristic of living CDSA means that the process can be regarded as a type of “living supramolecular polymerization” that is analogous to living covalent (e.g. anionic) polymerizations of molecular monomers and also to biological “nucleation-elongation” processes such as amyloid fiber growth. Living CDSA was discovered as a result of an investigation of the solution self-assembly behavior of block copolymers with crystallizable polyferrocenylsilane (PFS) metalloblocks but has now been extended to an array of block copolymers with crystallisable organic blocks, including pi-conjugated or biodegradable materials, and also to molecular amphiphiles that form pi-stacked supramolecular polymeric assemblies. Potential applications exist in areas from nanoelectronics to delivery vehicles.