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Programming 蟺-System Structure and Function by Hydrogen Bonding

Date:
-
Location:
CP-114
Speaker(s) / Presenter(s):
Ron Castellano
Although 鈥渙rdered鈥 organic 蟺-conjugated assemblies outperform 鈥渄isordered鈥 ones in many optoelectronic device applications, we are far from being able to port the well-understood supramolecular recipes of 蟺-systems from solution to solid-state device environments. For the past several years we have been exploring hydrogen bond (H-bond) directed self-assembly of 蟺-systems along these lines, for example, to enhance their absorption and charge transport properties for organic photovoltaic (OPV) applications. Various examples of oligothiophenes outfitted with heterocycles capable of forming H-bonded 鈥渞osettes鈥 will be discussed in this context. The second part of the talk will introduce new monomers derived from [2.2]paracyclophane (pCp) that are capable of robust H-bond directed self-assembly into one-dimensional nanostructures in solution and the solid state. The design introduces transannular (intramolecular) H-bonds between pairs of pseudo-ortho-positioned amides as a way to preorganize the molecules for intermolecular H-bonding with two neighbors. The result is formation of homochiral, one-dimensional pCp stacks that show supramolecular polymer signatures in solution.