Using photochemical [2 + 2] cycloaddition, a cyclobutane dione was generated from isophorone, a condensate of bio-acetone.

Whispering gallery mode resonator (WGMR) microspheres yield highly structured optical spectra that are extremely sensitive to their environment and are of intense interest for use in a variety of sensing...

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A series of four lanthanide thenoyltrifluoroacetone (TTA) complexes consisting of two f 0 (La 3+ and Ce 4+ ) and two f 1 (Ce 3+ ) complexes was examined using steady-state and timeresolved spectroscopic techniques. The wide range of spectroscopic techniques presented herein have enabled us to discern the nature of the excited states (charge transfer, CT vs ligand localized, LL) as well as construct a Jablonski diagram for detailing the excited state reactivity within the series of molecules. The wavelength and excitation power dependence for these series of complexes are the first direct verification for the presence of simultaneous competing, noninteracting CT and LL excited states. Additionally, a computational framework is described that can be used to support spectroscopic assignments as a guide for future studies. Finally, the relationship between the obtained photophysics and possible photochemical separation mechanisms is described.