Chemistry Seminar: Tuning electronic structures of BODIPYs and aza-BODIPYs for non-covalent interactions with nano-carbon materials and photoinduced electron transfer toward a rational design of new light-harvesting materials
Dr. Victor Nemykin University of Manitoba
Date & Time:
12:15 PM - 1:20 PM
Two series of ferrocene-containing BODIPYs and aza-BODIPYs with pyrene fragment attached at the a- and b-pyrrolic positions were have been prepared using several synthetic methodologies. New systems were characterized by UV-Vis-NIR, NMR, HRMS, and X-ray crystallography, while their redox properties were investigated by electrochemical and spectroelectrochemical methods as well as by the chemical oxidation approach. The experimental electronic, spectroscopic, and geometric parameters of the organometallic BODIPYs and azaBODIPYs were correlated with DFT and TDDFT calculations. It was shown by X-ray crystallography and solid-state UV-vis spectroscopy that by tuning the electronic structures of pyrene-containing BODIPYs and aza-BODIPYs it is possible to facilitate pyrene-to-nano-carbon or BODIPY-to-nano-carbon interactions. Transient absorption spectroscopy data are indicative of the lack of the photoinduced electron transfer processes between organic chromophores and fullerenes upon excitation of BODIPYs or aza-BODIPYs at the NIR region. Possible electron transfer was observed in the case of aza-BODIPY or BODIPY compounds with graphene or single wall carbon nanotubes upon excitation in the NIR region.