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To turn on the fluorescence of the native green fluorescence protein (GFP) chromophore, 4‐hydroxybenzylidene‐dimethylimidazolinone (HBDI), in an artificial supramolecular system has been a challenging task, because it requires high local environmental rigidity. This work shows that the formation of H‐aggregates of an HBDI‐containing organogelator results in two orders of magnitude fluorescence enhancement (Φf=2.9 vs. 0.02 %), in which the inter‐HBDI OH⋅⋅⋅OH H‐bonds play a crucial role. The aggregation‐induced fluorescence enhancement of HBDI has important implications on the origin of the high fluorescence quantum efficiency of HBDI in the GFP β‐barrel and on the supramolecular strategy for a full fluorescence recovery of HBDI. These results reveal a new approach to designing rigid chromophore aggregates for high‐performance optoelectronic properties. [ABSTRACT FROM AUTHOR]

We present the first in situsurface Raman spectra of hydrogen on rhodium under electrochemical conditions using gold-core rhodium-shell (Au@Rh) nanoparticles for SERS or gold-core silica-shell (Au@SiO2) nanoparticles for SHINERS. The advantage of SHINERS lies in the versatility to study single crystal surfaces such as the H–Rh(111) system. [ABSTRACT FROM AUTHOR]

Cover Feature: Hydrogen Bonding-Induced H-Aggregation for Fluorescence Turn-On of the GFP Chromophore: Supramolecular Structural Rigidity (Chem. Eur. J. 27/2020) Keywords: aggregation; fluorescence; gels; hydrogen bonds; supramolecular chemistry EN aggregation fluorescence gels hydrogen bonds supramolecular chemistry 5913 5913 1 05/14/20 20200512 NES 200512 B The fluorescence of HBDI b (the dark green molecules in the lower part of the picture), the chromophore of a naturally occurring green fluorescence protein (GFP) in the jellyfish Aequorea Victoria, is turned on upon forming an H-type aggregate (the structure in the upper part of the picture) via the hydrogen bonding of the chromophores and the gelators (the two terminal parts of the H-aggregate). Aggregation, fluorescence, gels, hydrogen bonds, supramolecular chemistry. [Extracted from the article]